diff --git a/frontend/src/uxbox/main/data/auth.cljs b/frontend/src/uxbox/main/data/auth.cljs
index 1450dd6b9..591d1513d 100644
--- a/frontend/src/uxbox/main/data/auth.cljs
+++ b/frontend/src/uxbox/main/data/auth.cljs
@@ -6,7 +6,7 @@
 
 (ns uxbox.main.data.auth
   (:require
-   [struct.alpha :as st]
+   [cljs.spec.alpha :as s]
    [beicon.core :as rx]
    [potok.core :as ptk]
    [uxbox.main.repo :as rp]
@@ -14,9 +14,15 @@
    [uxbox.main.data.users :as du]
    [uxbox.util.messages :as um]
    [uxbox.util.router :as rt]
+   [uxbox.util.spec :as us]
    [uxbox.util.i18n :as i18n :refer [tr]]
    [uxbox.util.storage :refer [storage]]))
 
+(s/def ::username string?)
+(s/def ::password string?)
+(s/def ::fullname string?)
+(s/def ::email ::us/email)
+
 ;; --- Logged In
 
 ;; TODO: add spec
@@ -43,13 +49,12 @@
 
 ;; --- Login
 
-(st/defs ::login
-  (st/dict :username ::st/string
-          :password ::st/string))
+(s/def ::login-params
+  (s/keys :req-un [::username ::password]))
 
 (defn login
   [{:keys [username password] :as data}]
-  (assert (st/valid? ::login data))
+  (s/assert ::login-params data)
   (reify
     ptk/UpdateEvent
     (update [_ state]
@@ -93,17 +98,17 @@
 
 ;; --- Register
 
-(st/defs ::register
-  (st/dict :fullname ::st/string
-          :username ::st/string
-          :password ::st/string
-          :email ::st/email))
+(s/def ::register-params
+  (s/keys :req-un [::fullname
+                   ::username
+                   ::password
+                   ::email]))
 
 (defn register
   "Create a register event instance."
   [data on-error]
-  (assert (st/valid? ::register data))
-  (assert (fn? on-error))
+  (s/assert ::register-params data)
+  (s/assert ::us/fn on-error)
   (reify
     ptk/WatchEvent
     (watch [_ state stream]
@@ -122,12 +127,12 @@
 
 ;; --- Recovery Request
 
-(st/defs ::recovery-request
-  (st/dict :username ::st/string))
+(s/def ::recovery-request-params
+  (s/keys :req-un [::username]))
 
 (defn recovery-request
   [data]
-  (assert (st/valid? ::recovery-request data))
+  (s/assert ::recovery-request-params data)
   (reify
     ptk/WatchEvent
     (watch [_ state stream]
@@ -164,13 +169,13 @@
 
 ;; --- Recovery (Password)
 
-(st/defs ::recovery
-  (st/dict :username ::st/string
-          :token ::st/string))
+(s/def ::token string?)
+(s/def ::recovery-params
+  (s/keys :req-un [::username ::token]))
 
 (defn recovery
   [{:keys [token password] :as data}]
-  (assert (st/valid? ::recovery data))
+  (s/assert ::recovery-params data)
   (reify
     ptk/WatchEvent
     (watch [_ state stream]
diff --git a/frontend/src/uxbox/main/data/pages.cljs b/frontend/src/uxbox/main/data/pages.cljs
index af429d42f..8c85f7cf7 100644
--- a/frontend/src/uxbox/main/data/pages.cljs
+++ b/frontend/src/uxbox/main/data/pages.cljs
@@ -6,10 +6,10 @@
 
 (ns uxbox.main.data.pages
   (:require
+   [cljs.spec.alpha :as s]
    [beicon.core :as rx]
    [cuerdas.core :as str]
    [potok.core :as ptk]
-   [struct.alpha :as st]
    [uxbox.main.repo :as rp]
    [uxbox.util.data :refer [index-by-id]]
    [uxbox.util.spec :as us]
@@ -18,54 +18,65 @@
 
 ;; --- Struct
 
-(st/defs ::inst inst?)
-(st/defs ::width (st/&& ::st/number ::st/positive))
-(st/defs ::height (st/&& ::st/number ::st/positive))
+(s/def ::id ::us/uuid)
+(s/def ::name ::us/string)
+(s/def ::inst ::us/inst)
+(s/def ::type ::us/keyword)
+(s/def ::project ::us/uuid)
+(s/def ::created-at ::us/inst)
+(s/def ::modified-at ::us/inst)
+(s/def ::version ::us/number)
+(s/def ::width (s/and ::us/number ::us/positive))
+(s/def ::height (s/and ::us/number ::us/positive))
+(s/def ::grid-x-axis ::us/number)
+(s/def ::grid-y-axis ::us/number)
+(s/def ::grid-color ::us/string)
+(s/def ::order ::us/number)
+(s/def ::background ::us/string)
+(s/def ::background-opacity ::us/number)
+(s/def ::user ::us/uuid)
 
-(st/defs ::metadata
-  (st/dict :width ::width
-           :height ::height
-           :grid-y-axis (st/opt ::st/number)
-           :grid-x-axis (st/opt ::st/number)
-           :grid-color (st/opt ::st/string)
-           :order (st/opt ::st/number)
-           :background (st/opt ::st/string)
-           :background-opacity (st/opt ::st/number)))
+(s/def ::metadata
+  (s/keys :req-un [::width ::height]
+          :opt-un [::grid-y-axis
+                   ::grid-x-axis
+                   ::grid-color
+                   ::order
+                   ::background
+                   ::background-opacity]))
 
-(st/defs ::shapes-list
-  (st/coll-of ::st/uuid))
+(s/def ::shapes
+  (s/coll-of ::us/uuid :kind vector? :into []))
 
-(st/defs ::page-entity
-  (st/dict :id ::st/uuid
-           :name ::st/string
-           :project ::st/uuid
-           :created-at ::inst
-           :modified-at ::inst
-           :user ::st/uuid
-           :metadata ::metadata
-           :shapes ::shapes-list))
+(s/def ::page-entity
+  (s/keys :req-un [::id
+                   ::name
+                   ::project
+                   ::created-at
+                   ::modified-at
+                   ::user
+                   ::metadata
+                   ::shapes]))
 
-(st/defs ::minimal-shape
-  (st/dict :id ::st/uuid
-           :type ::st/keyword
-           :name ::st/string))
+(s/def ::minimal-shape
+  (s/keys :req-un [::type ::name]
+          :opt-un [::id]))
 
-(st/defs ::server-page-data-sapes
-  (st/coll-of ::minimal-shape))
+(s/def :uxbox.backend/shapes
+  (s/coll-of ::minimal-shape :kind vector?))
 
-(st/defs ::server-page-data
-  (st/dict :shapes ::server-page-data-sapes))
+(s/def :uxbox.backend/data
+  (s/keys :req-un [:uxbox.backend/shapes]))
 
-(st/defs ::server-page
-  (st/dict :id ::st/uuid
-           :name ::st/string
-           :project ::st/uuid
-           :version ::st/integer
-           :created-at ::inst
-           :modified-at ::inst
-           :user ::st/uuid
-           :metadata ::metadata
-           :data ::server-page-data))
+(s/def ::server-page
+  (s/keys :req-un [::id ::name
+                   ::project
+                   ::version
+                   ::created-at
+                   ::modified-at
+                   ::user
+                   ::metadata
+                   :uxbox.backend/data]))
 
 ;; --- Protocols
 
@@ -173,15 +184,12 @@
 
 (declare rehash-pages)
 
-(st/defs ::page-created
-  (st/dict :id ::st/uuid
-           :name ::st/string
-           :project ::st/uuid
-           :metadata ::metadata))
+(s/def ::page-created-params
+  (s/keys :req-un [::id ::name ::project ::metadata]))
 
 (defn page-created
   [data]
-  (assert (st/valid? ::page-created data) "invalid parameters")
+  (s/assert ::page-created-event data)
   (reify
     ptk/UpdateEvent
     (update [_ state]
@@ -197,15 +205,12 @@
 
 ;; --- Create Page
 
-(st/defs ::create-page
-  (st/dict :name ::st/string
-           :project ::st/uuid
-           :width ::width
-           :height ::height))
+(s/def ::created-page-params
+  (s/keys :req-un [::name ::project ::width ::height]))
 
 (defn create-page
   [{:keys [name project width height layout] :as data}]
-  (assert (st/valid? ::create-page data))
+  (s/assert ::created-page-params data)
   (reify
     ptk/WatchEvent
     (watch [this state s]
@@ -231,7 +236,7 @@
 
 (defn page-persisted
   [data]
-  (assert (st/valid? ::server-page data))
+  (s/assert ::server-page data)
   (reify
     cljs.core/IDeref
     (-deref [_] data)
@@ -278,24 +283,24 @@
 
 ;; --- Page Metadata Persisted
 
-(deftype MetadataPersisted [id data]
-  ptk/UpdateEvent
-  (update [_ state]
-    (assoc-in state [:pages id :version] (:version data))))
-
-(st/defs ::version integer?)
-(st/defs ::metadata-persisted-event
-  (st/dict :id ::st/uuid
-           :version ::version))
-
-(defn metadata-persisted?
-  [v]
-  (instance? MetadataPersisted v))
+(s/def ::metadata-persisted-params
+  (s/keys :req-un [::id ::version]))
 
 (defn metadata-persisted
   [{:keys [id] :as data}]
-  {:pre [(st/valid? ::metadata-persisted-event data)]}
-  (MetadataPersisted. id data))
+  (s/assert ::metadata-persisted-params data)
+  (reify
+    ptk/EventType
+    (type [_] ::metadata-persisted)
+
+    ptk/UpdateEvent
+    (update [_ state]
+      (assoc-in state [:pages id :version] (:version data)))))
+
+(defn metadata-persisted?
+  [v]
+  (= ::metadata-persisted (ptk/type v)))
+
 
 ;; --- Persist Page Metadata
 
@@ -316,29 +321,28 @@
 
 ;; --- Update Page
 
-(deftype UpdatePage [id data]
-  IPageUpdate
-  ptk/UpdateEvent
-  (update [_ state]
-    (update-in state [:pages id] merge (dissoc data :id :version))))
-
 (defn update-page
   [id data]
-  {:pre [(uuid? id) (st/valid? ::page-entity data)]}
-  (UpdatePage. id data))
+  (s/assert ::page-entity data)
+  (s/assert ::id id)
+  (reify
+    IPageUpdate
+    ptk/UpdateEvent
+    (update [_ state]
+      (update-in state [:pages id] merge (dissoc data :id :version)))))
 
 ;; --- Update Page Metadata
 
-(deftype UpdateMetadata [id metadata]
-  IMetadataUpdate
-  ptk/UpdateEvent
-  (update [this state]
-    (assoc-in state [:pages id :metadata] metadata)))
-
 (defn update-metadata
   [id metadata]
-  {:pre [(uuid? id) (st/valid? ::metadata metadata)]}
-  (UpdateMetadata. id metadata))
+  (s/assert ::id id)
+  (s/assert ::metadata metadata)
+  (reify
+    IMetadataUpdate
+    ptk/UpdateEvent
+    (update [this state]
+      (assoc-in state [:pages id :metadata] metadata))))
+
 
 ;; --- Rehash Pages
 ;;
@@ -382,24 +386,21 @@
 ;; A specialized event for persist data
 ;; from the update page form.
 
-(st/defs ::persist-page-update-form
-  (st/dict :id ::st/uuid
-           :name ::st/string
-           :width ::width
-           :height ::height))
+(s/def ::persist-page-update-form-params
+  (s/keys :req-un [::id ::name ::width ::height]))
 
 (defn persist-page-update-form
   [{:keys [id name width height] :as data}]
-  (assert (st/valid? ::persist-page-update-form data))
+  (s/assert ::persist-page-update-form-params data)
   (reify
-    ptk/WatchEvent
-    (watch [_ state stream]
-      (let [page (-> (get-in state [:pages id])
-                     (assoc-in [:name] name)
-                     (assoc-in [:metadata :width] width)
-                     (assoc-in [:metadata :height] height))]
-        (rx/of (update-page id page))))))
-
+    ptk/UpdateEvent
+    (update [_ state]
+      (update-in state [:pages id]
+                 (fn [page]
+                   (-> (assoc page :name name)
+                       (assoc-in [:name] name)
+                       (assoc-in [:metadata :width] width)
+                       (assoc-in [:metadata :height] height)))))))
 
 ;; --- Delete Page (by id)
 
diff --git a/frontend/src/uxbox/main/data/projects.cljs b/frontend/src/uxbox/main/data/projects.cljs
index 7c4edfa19..9d4bb03a3 100644
--- a/frontend/src/uxbox/main/data/projects.cljs
+++ b/frontend/src/uxbox/main/data/projects.cljs
@@ -10,7 +10,6 @@
    [cuerdas.core :as str]
    [beicon.core :as rx]
    [potok.core :as ptk]
-   [struct.core :as st]
    [uxbox.main.repo :as rp]
    [uxbox.main.data.pages :as udp]
    [uxbox.util.uuid :as uuid]
@@ -35,21 +34,12 @@
                     ::created-at
                     ::modified-at]))
 
-(st/defs project-spec
-  {:id [st/required st/uuid]
-   :name [st/required st/string]
-   :version [st/required st/integer]
-   :user [st/required st/uuid]
-   :created-at [st/required inst?]
-   :modified-at [st/required inst?]})
-
 ;; --- Helpers
 
 (defn assoc-project
   "A reduce function for assoc the project to the state map."
   [state {:keys [id] :as project}]
-  (assert (st/valid? project-spec project)
-          "invalid project instance")
+  (s/assert ::project-entity project)
   (update-in state [:projects id] merge project))
 
 (defn dissoc-project
@@ -170,15 +160,12 @@
 
 ;; --- Create Project
 
-(st/defs create-project-spec
-  {:name [st/required st/string]
-   :width [st/required st/number st/positive]
-   :height [st/required st/number st/positive]})
+(s/def ::create-project-params
+  (s/keys :req-un [::name ::width ::height]))
 
 (defn create-project
   [{:keys [name] :as params}]
-  (assert (st/valid? create-project-spec params)
-          "invalid params for create project event")
+  (s/assert ::create-project-params params)
   (reify
     ptk/WatchEvent
     (watch [this state stream]
diff --git a/frontend/src/uxbox/main/data/shapes.cljs b/frontend/src/uxbox/main/data/shapes.cljs
index 154bdf6c2..681ceef1e 100644
--- a/frontend/src/uxbox/main/data/shapes.cljs
+++ b/frontend/src/uxbox/main/data/shapes.cljs
@@ -5,14 +5,17 @@
 ;; Copyright (c) 2015-2019 Andrey Antukh <niwi@niwi.nz>
 
 (ns uxbox.main.data.shapes
-  (:require [cljs.spec.alpha :as s]
-            [uxbox.main.geom :as geom]
-            [uxbox.util.geom.matrix :as gmt]
-            [uxbox.util.uuid :as uuid]
-            [uxbox.util.data :refer [index-of]]))
+  (:require
+   [cljs.spec.alpha :as s]
+   [uxbox.main.geom :as geom]
+   [uxbox.util.data :refer [index-of]]
+   [uxbox.util.geom.matrix :as gmt]
+   [uxbox.util.spec :as us]
+   [uxbox.util.uuid :as uuid]))
 
 ;; --- Specs
 
+(s/def ::id ::us/uuid)
 (s/def ::blocked boolean?)
 (s/def ::collapsed boolean?)
 (s/def ::content string?)
@@ -49,7 +52,7 @@
 (s/def ::attributes
   (s/keys :opt-un [::blocked
                    ::collapsed
-                   ::conent
+                   ::content
                    ::fill-color
                    ::fill-opacity
                    ::font-family
@@ -72,10 +75,10 @@
                    ::y1 ::y2]))
 
 (s/def ::minimal-shape
-  (s/keys ::req-un [::id ::page ::type ::name]))
+  (s/keys :req-un [::id ::page ::type ::name]))
 
 (s/def ::shape
-  (s/merge ::minimal-shape ::attributes))
+  (s/and ::minimal-shape ::attributes))
 
 (s/def ::rect-like-shape
   (s/keys :req-un [::x1 ::y1 ::x2 ::y2 ::type]))
diff --git a/frontend/src/uxbox/main/data/users.cljs b/frontend/src/uxbox/main/data/users.cljs
index a00abc355..93919375f 100644
--- a/frontend/src/uxbox/main/data/users.cljs
+++ b/frontend/src/uxbox/main/data/users.cljs
@@ -6,8 +6,8 @@
 
 (ns uxbox.main.data.users
   (:require
+   [cljs.spec.alpha :as s]
    [beicon.core :as rx]
-   [struct.core :as s]
    [potok.core :as ptk]
    [uxbox.main.repo :as rp]
    [uxbox.util.i18n :as i18n :refer [tr]]
@@ -58,17 +58,22 @@
 
 ;; --- Update Profile
 
-(s/defs update-profile-spec
-  {:fullname [s/required s/string]
-   :email [s/required s/email]
-   :username [s/required s/string]
-   :language [s/required s/string]})
+(s/def ::fullname string?)
+(s/def ::email ::us/email)
+(s/def ::password string?)
+(s/def ::language string?)
+
+(s/def ::update-profile-params
+  (s/keys :req-un [::fullname
+                   ::email
+                   ::username
+                   ::language]))
 
 (defn update-profile
   [data {:keys [on-success on-error]}]
-  {:pre [(s/valid? update-profile-spec data)
-         (fn? on-error)
-         (fn? on-success)]}
+  (s/assert ::update-profile-params data)
+  (s/assert ::us/fn on-error)
+  (s/assert ::us/fn on-success)
   (reify
     ptk/WatchEvent
     (watch [_ state s]
@@ -89,16 +94,20 @@
 
 ;; --- Update Password (Form)
 
-(s/defs update-password-spec
-  {:password-1 [s/required s/string]
-   :password-2 [s/required s/string [s/identical-to :password-1]]
-   :password-old [s/required s/string]})
+(s/def ::password-1 string?)
+(s/def ::password-2 string?)
+(s/def ::password-old string?)
+
+(s/def ::update-password-params
+  (s/keys :req-un [::password-1
+                   ::password-2
+                   ::password-old]))
 
 (defn update-password
   [data {:keys [on-success on-error]}]
-  {:pre [(s/valid? update-password-spec data)
-         (fn? on-success)
-         (fn? on-error)]}
+  (s/assert ::update-password-params data)
+  (s/assert ::us/fn on-success)
+  (s/assert ::us/fn on-error)
   (reify
     ptk/WatchEvent
     (watch [_ state s]
diff --git a/frontend/src/uxbox/main/data/workspace.cljs b/frontend/src/uxbox/main/data/workspace.cljs
index c0fa4f1f2..da4a8be35 100644
--- a/frontend/src/uxbox/main/data/workspace.cljs
+++ b/frontend/src/uxbox/main/data/workspace.cljs
@@ -7,7 +7,6 @@
 (ns uxbox.main.data.workspace
   (:require
    [beicon.core :as rx]
-   ;; [uxbox.main.data.workspace.ruler :as wruler]
    [cljs.spec.alpha :as s]
    [potok.core :as ptk]
    [uxbox.config :as cfg]
@@ -342,7 +341,6 @@
 
 (defn add-shape
   [data]
-  {:pre [(us/valid? ::ds/shape data)]}
   (reify
     udp/IPageUpdate
     ptk/UpdateEvent
@@ -426,32 +424,27 @@
 
 ;; --- Update Shape Attrs
 
-(deftype UpdateShapeAttrs [id attrs]
-  ptk/UpdateEvent
-  (update [_ state]
-    (update-in state [:shapes id] merge attrs)))
-
 (defn update-shape-attrs
   [id attrs]
-  {:pre [(uuid? id) (us/valid? ::ds/attributes attrs)]}
-  (let [atts (us/extract attrs ::ds/attributes)]
-    (UpdateShapeAttrs. id attrs)))
+  (s/assert ::us/uuid id)
+  (s/assert ::ds/attributes attrs)
+  (let [atts (s/conform ::ds/attributes attrs)]
+    (reify
+      ptk/UpdateEvent
+      (update [_ state]
+        (update-in state [:shapes id] merge attrs)))))
 
 ;; --- Update Selected Shapes attrs
 
-
-(deftype UpdateSelectedShapesAttrs [attrs]
-  ptk/WatchEvent
-  (watch [_ state stream]
-    (let [pid (get-in state [:workspace :current])
-          selected (get-in state [:workspace pid :selected])]
-      (rx/from-coll (map #(update-shape-attrs % attrs) selected)))))
-
 (defn update-selected-shapes-attrs
   [attrs]
-  {:pre [(us/valid? ::ds/attributes attrs)]}
-  (UpdateSelectedShapesAttrs. attrs))
-
+  (s/assert ::ds/attributes attrs)
+  (reify
+    ptk/WatchEvent
+    (watch [_ state stream]
+      (let [pid (get-in state [:workspace :current])
+            selected (get-in state [:workspace pid :selected])]
+        (rx/from-coll (map #(update-shape-attrs % attrs) selected))))))
 
 ;; --- Move Selected
 
@@ -485,48 +478,44 @@
 (declare materialize-current-modifier)
 (declare apply-temporal-displacement)
 
-(defrecord MoveSelected [direction speed]
-  ptk/WatchEvent
-  (watch [_ state stream]
-    (let [page-id (get-in state [:workspace :current])
-          workspace (get-in state [:workspace page-id])
-          selected (:selected workspace)
-          flags (:flags workspace)
-          align? (refs/alignment-activated? flags)
-          metadata (merge c/page-metadata (get-in state [:pages page-id :metadata]))
-          distance (get-displacement-distance metadata align?)
-          displacement (get-displacement direction speed distance)]
-      (rx/concat
-       (when align?
-         (rx/concat
-          (rx/from-coll (map initial-shape-align selected))
-          (rx/from-coll (map apply-displacement selected))))
-       (rx/from-coll (map #(apply-temporal-displacement % displacement) selected))
-       (rx/from-coll (map materialize-current-modifier selected))))))
-
 (s/def ::direction #{:up :down :right :left})
 (s/def ::speed #{:std :fast})
 
 (defn move-selected
   [direction speed]
-  {:pre [(us/valid? ::direction direction)
-         (us/valid? ::speed speed)]}
-  (MoveSelected. direction speed))
+  (s/assert ::direction direction)
+  (s/assert ::speed speed)
+  (reify
+    ptk/WatchEvent
+    (watch [_ state stream]
+      (let [page-id (get-in state [:workspace :current])
+            workspace (get-in state [:workspace page-id])
+            selected (:selected workspace)
+            flags (:flags workspace)
+            align? (refs/alignment-activated? flags)
+            metadata (merge c/page-metadata (get-in state [:pages page-id :metadata]))
+            distance (get-displacement-distance metadata align?)
+            displacement (get-displacement direction speed distance)]
+        (rx/concat
+         (when align?
+           (rx/concat
+            (rx/from-coll (map initial-shape-align selected))
+            (rx/from-coll (map apply-displacement selected))))
+         (rx/from-coll (map #(apply-temporal-displacement % displacement) selected))
+         (rx/from-coll (map materialize-current-modifier selected)))))))
 
 ;; --- Move Selected Layer
 
-(defrecord MoveSelectedLayer [loc]
-  udp/IPageUpdate
-  ptk/UpdateEvent
-  (update [_ state]
-    (let [id (get-in state [:workspace :current])
-          selected (get-in state [:workspace id :selected])]
-      (ds/move-layer state selected loc))))
-
 (defn move-selected-layer
   [loc]
-  {:pre [(us/valid? ::direction loc)]}
-  (MoveSelectedLayer. loc))
+  (assert (s/valid? ::direction loc))
+  (reify
+    udp/IPageUpdate
+    ptk/UpdateEvent
+    (update [_ state]
+      (let [id (get-in state [:workspace :current])
+            selected (get-in state [:workspace id :selected])]
+        (ds/move-layer state selected loc)))))
 
 ;; --- Update Shape Position
 
@@ -708,22 +697,24 @@
 
 ;; --- Update Dimensions
 
-(deftype UpdateDimensions [id dimensions]
-  udp/IPageUpdate
-  ptk/UpdateEvent
-  (update [_ state]
-    (update-in state [:shapes id] geom/resize-dim dimensions)))
+(s/def ::width (s/and ::us/number ::us/positive))
+(s/def ::height (s/and ::us/number ::us/positive))
 
-(s/def ::update-dimensions-opts
+(s/def ::update-dimensions
   (s/keys :opt-un [::width ::height]))
 
 (defn update-dimensions
   "A helper event just for update the position
   of the shape using the width and height attrs
   instread final point of coordinates."
-  [id opts]
-  {:pre [(uuid? id) (us/valid? ::update-dimensions-opts opts)]}
-  (UpdateDimensions. id opts))
+  [id dimensions]
+  (s/assert ::us/uuid id)
+  (s/assert ::update-dimensions dimensions)
+  (reify
+    udp/IPageUpdate
+    ptk/UpdateEvent
+    (update [_ state]
+      (update-in state [:shapes id] geom/resize-dim dimensions))))
 
 ;; --- Update Interaction
 
@@ -983,16 +974,15 @@
 
 ;; Is a workspace aware wrapper over uxbox.data.pages/UpdateMetadata event.
 
-(defrecord UpdateMetadata [id metadata]
-  ptk/WatchEvent
-  (watch [_ state s]
-    (rx/of (udp/update-metadata id metadata)
-           (initialize-alignment id))))
-
 (defn update-metadata
   [id metadata]
-  {:pre [(uuid? id) (us/valid? ::udp/metadata metadata)]}
-  (UpdateMetadata. id metadata))
+  (s/assert ::us/uuid id)
+  (s/assert ::udp/metadata metadata)
+  (reify
+    ptk/WatchEvent
+    (watch [_ state s]
+      (rx/of (udp/update-metadata id metadata)
+             (initialize-alignment id)))))
 
 (defrecord OpenView [page-id]
   ptk/WatchEvent
diff --git a/frontend/src/uxbox/main/ui/auth/login.cljs b/frontend/src/uxbox/main/ui/auth/login.cljs
index 94d995fc1..7edd5d571 100644
--- a/frontend/src/uxbox/main/ui/auth/login.cljs
+++ b/frontend/src/uxbox/main/ui/auth/login.cljs
@@ -8,20 +8,22 @@
 (ns uxbox.main.ui.auth.login
   (:require
    [rumext.alpha :as mf]
-   [struct.alpha :as s]
+   [cljs.spec.alpha :as s]
    [uxbox.builtins.icons :as i]
    [uxbox.config :as cfg]
    [uxbox.main.data.auth :as da]
    [uxbox.main.store :as st]
    [uxbox.main.ui.messages :refer [messages-widget]]
    [uxbox.util.dom :as dom]
-   [uxbox.util.forms :as fm]
+   [uxbox.util.forms2 :as fm2]
    [uxbox.util.i18n :refer [tr]]
    [uxbox.util.router :as rt]))
 
-(s/defs ::login-form
-  (s/dict :username (s/&& ::s/string ::fm/not-empty-string)
-          :password (s/&& ::s/string ::fm/not-empty-string)))
+(s/def ::username ::fm2/not-empty-string)
+(s/def ::password ::fm2/not-empty-string)
+
+(s/def ::login-form
+  (s/keys :req-un [::username ::password]))
 
 (defn- on-submit
   [event form]
@@ -42,7 +44,8 @@
 
 (mf/defc login-form
   []
-  (let [{:keys [data] :as form} (fm/use-form ::login-form {})]
+  (let [{:keys [data] :as form} (fm2/use-form ::login-form {})]
+    (prn "login-form" form)
     [:form {:on-submit #(on-submit % form)}
      [:div.login-content
       (when cfg/isdemo
@@ -52,16 +55,18 @@
        {:name "username"
         :tab-index "2"
         :value (:username data "")
-        :on-blur (fm/on-input-blur form :username)
-        :on-change (fm/on-input-change form :username)
+        :class (fm2/error-class form :username)
+        :on-blur (fm2/on-input-blur form :username)
+        :on-change (fm2/on-input-change form :username)
         :placeholder (tr "auth.email-or-username")
         :type "text"}]
       [:input.input-text
        {:name "password"
         :tab-index "3"
         :value (:password data "")
-        :on-blur (fm/on-input-blur form :password)
-        :on-change (fm/on-input-change form :password)
+        :class (fm2/error-class form :password)
+        :on-blur (fm2/on-input-blur form :password)
+        :on-change (fm2/on-input-change form :password)
         :placeholder (tr "auth.password")
         :type "password"}]
       [:input.btn-primary
diff --git a/frontend/src/uxbox/main/ui/auth/register.cljs b/frontend/src/uxbox/main/ui/auth/register.cljs
index 261a2a98a..e9fe97786 100644
--- a/frontend/src/uxbox/main/ui/auth/register.cljs
+++ b/frontend/src/uxbox/main/ui/auth/register.cljs
@@ -53,7 +53,6 @@
 (mf/defc register-form
   [props]
   (let [{:keys [data] :as form} (fm/use-form ::register-form {})]
-    (prn "register-form" form)
     [:form {:on-submit #(on-submit % form)}
      [:div.login-content
       [:input.input-text
diff --git a/frontend/src/uxbox/main/ui/settings/password.cljs b/frontend/src/uxbox/main/ui/settings/password.cljs
index 9737f6725..fa559aabb 100644
--- a/frontend/src/uxbox/main/ui/settings/password.cljs
+++ b/frontend/src/uxbox/main/ui/settings/password.cljs
@@ -8,38 +8,40 @@
 (ns uxbox.main.ui.settings.password
   (:require
    [rumext.alpha :as mf]
-   [struct.alpha :as s]
+   [cljs.spec.alpha :as s]
    [uxbox.builtins.icons :as i]
    [uxbox.main.data.users :as udu]
    [uxbox.main.store :as st]
    [uxbox.util.dom :as dom]
-   [uxbox.util.forms :as fm]
+   [uxbox.util.forms2 :as fm]
    [uxbox.util.i18n :refer [tr]]
    [uxbox.util.messages :as um]))
 
+(defn- on-error
+  [form error]
+  (case (:code error)
+    :uxbox.services.users/old-password-not-match
+    (swap! form assoc-in [:errors :password-old]
+           {:type ::api :message "settings.password.wrong-old-password"})
+
+    :else (throw (ex-info "unexpected" {:error error}))))
+
 (defn- on-submit
   [event form]
-  (letfn [(on-error [error]
-            (case (:code error)
-              :uxbox.services.users/old-password-not-match
-              (swap! form assoc-in [:errors :password-old]
-                     {:type ::api :message "settings.password.wrong-old-password"})
+  (dom/prevent-default event)
+  (let [data (:clean-data form)
+        opts {:on-success #(st/emit! (um/info (tr "settings.password.password-saved")))
+              :on-error #(on-error form %)}]
+    (st/emit! (udu/update-password data opts))))
 
-              :else (throw (ex-info "unexpected" {:error error}))))
+(s/def ::password-1 ::fm/not-empty-string)
+(s/def ::password-2 ::fm/not-empty-string)
+(s/def ::password-old ::fm/not-empty-string)
 
-          (on-success [_]
-            (st/emit! (um/info (tr "settings.password.password-saved"))))]
-
-    (dom/prevent-default event)
-    (let [data (:clean-data form)
-          opts {:on-success on-success
-                :on-error on-error}]
-      (st/emit! (udu/update-password data opts)))))
-
-(s/defs ::password-form
-  (s/dict :password-1 (s/&& ::s/string ::fm/not-empty-string)
-          :password-2 (s/&& ::s/string ::fm/not-empty-string)
-          :password-old (s/&& ::s/string ::fm/not-empty-string)))
+(s/def ::password-form
+  (s/keys :req-un [::password-1
+                   ::password-2
+                   ::password-old]))
 
 (mf/defc password-form
   [props]
@@ -54,7 +56,8 @@
        :on-blur (fm/on-input-blur form :password-old)
        :on-change (fm/on-input-change form :password-old)
        :placeholder (tr "settings.password.old-password")}]
-     [:& fm/field-error {:form  form :field :password-old}]
+
+     [:& fm/field-error {:form  form :field :password-old :type ::api}]
 
      [:input.input-text
       {:type "password"
@@ -64,7 +67,7 @@
        :on-blur (fm/on-input-blur form :password-1)
        :on-change (fm/on-input-change form :password-1)
        :placeholder (tr "settings.password.new-password")}]
-     [:& fm/field-error {:form form :field :password-1}]
+     ;; [:& fm/field-error {:form form :field :password-1}]
 
      [:input.input-text
       {:type "password"
@@ -74,7 +77,7 @@
        :on-blur (fm/on-input-blur form :password-2)
        :on-change (fm/on-input-change form :password-2)
        :placeholder (tr "settings.password.confirm-password")}]
-     [:& fm/field-error {:form form :field :password-2}]
+     ;; [:& fm/field-error {:form form :field :password-2}]
 
      [:input.btn-primary
       {:type "submit"
diff --git a/frontend/src/uxbox/main/ui/settings/profile.cljs b/frontend/src/uxbox/main/ui/settings/profile.cljs
index 814d36e52..584935ff3 100644
--- a/frontend/src/uxbox/main/ui/settings/profile.cljs
+++ b/frontend/src/uxbox/main/ui/settings/profile.cljs
@@ -7,16 +7,16 @@
 
 (ns uxbox.main.ui.settings.profile
   (:require
+   [cljs.spec.alpha :as s]
    [cuerdas.core :as str]
    [lentes.core :as l]
    [rumext.alpha :as mf]
-   [struct.alpha :as s]
    [uxbox.builtins.icons :as i]
    [uxbox.main.data.users :as udu]
    [uxbox.main.store :as st]
    [uxbox.util.data :refer [read-string]]
    [uxbox.util.dom :as dom]
-   [uxbox.util.forms :as fm]
+   [uxbox.util.forms2 :as fm]
    [uxbox.util.i18n :as i18n :refer [tr]]
    [uxbox.util.interop :refer [iterable->seq]]
    [uxbox.util.messages :as um]))
@@ -32,11 +32,16 @@
   (-> (l/key :profile)
       (l/derive st/state)))
 
-(s/defs ::profile-form
-  (s/dict :fullname (s/&& ::s/string ::fm/not-empty-string)
-          :username (s/&& ::s/string ::fm/not-empty-string)
-          :language (s/&& ::s/string ::fm/not-empty-string)
-          :email ::s/email))
+(s/def ::fullname ::fm/not-empty-string)
+(s/def ::username ::fm/not-empty-string)
+(s/def ::language ::fm/not-empty-string)
+(s/def ::email ::fm/email)
+
+(s/def ::profile-form
+  (s/keys :req-un [::fullname
+                   ::username
+                   ::language
+                   ::email]))
 
 (defn- on-error
   [error form]
@@ -58,7 +63,6 @@
 
 (defn- on-submit
   [event form]
-  (prn "on-submit" form)
   (dom/prevent-default event)
   (let [data (:clean-data form)
         on-success #(st/emit! (um/info (tr "settings.profile.profile-saved")))
diff --git a/frontend/src/uxbox/main/ui/shapes/common.cljs b/frontend/src/uxbox/main/ui/shapes/common.cljs
index ef76169ec..c30f5b095 100644
--- a/frontend/src/uxbox/main/ui/shapes/common.cljs
+++ b/frontend/src/uxbox/main/ui/shapes/common.cljs
@@ -41,14 +41,12 @@
     (watch [_ state stream]
       (let [pid (get-in state [:workspace :current])
             selected (get-in state [:workspace pid :selected])]
-        (prn "start-move-selected" selected)
         (rx/from-coll (map start-move selected))))))
 
 (defn on-mouse-down
   [event {:keys [id type] :as shape} selected]
   (let [selected? (contains? selected id)
         drawing? @refs/selected-drawing-tool]
-    (prn "on-mouse-down" id type selected? (= type :canvas))
     (when-not (:blocked shape)
       (cond
         drawing?
diff --git a/frontend/src/uxbox/main/ui/shapes/path.cljs b/frontend/src/uxbox/main/ui/shapes/path.cljs
index 1cbd9b399..2889a1742 100644
--- a/frontend/src/uxbox/main/ui/shapes/path.cljs
+++ b/frontend/src/uxbox/main/ui/shapes/path.cljs
@@ -29,7 +29,6 @@
               (common/on-mouse-down event shape selected))
             (on-double-click [event]
               (when selected?
-                (prn "path-component$on-double-click")
                 (st/emit! (dw/start-edition-mode (:id shape)))))]
       [:g.shape {:class (when selected? "selected")
                  :on-double-click on-double-click
diff --git a/frontend/src/uxbox/util/forms2.cljs b/frontend/src/uxbox/util/forms2.cljs
new file mode 100644
index 000000000..8c3b8735c
--- /dev/null
+++ b/frontend/src/uxbox/util/forms2.cljs
@@ -0,0 +1,145 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; Copyright (c) 2015-2017 Andrey Antukh <niwi@niwi.nz>
+
+(ns uxbox.util.forms2
+  (:refer-clojure :exclude [uuid])
+  (:require
+   [beicon.core :as rx]
+   [cljs.spec.alpha :as s]
+   [cuerdas.core :as str]
+   [lentes.core :as l]
+   [potok.core :as ptk]
+   [rumext.alpha :as mf]
+   [uxbox.util.dom :as dom]
+   [uxbox.util.i18n :refer [tr]]))
+
+;; --- Handlers Helpers
+
+(defn- impl-mutator
+  [v update-fn]
+  (specify v
+    IReset
+    (-reset! [_ new-value]
+      (update-fn new-value))
+
+    ISwap
+    (-swap!
+      ([self f] (update-fn f))
+      ([self f x] (update-fn #(f % x)))
+      ([self f x y] (update-fn #(f % x y)))
+      ([self f x y more] (update-fn #(apply f % x y more))))))
+
+(defn- translate-error-type
+  [name]
+  "errors.undefined-error")
+
+(defn- interpret-problem
+  [acc {:keys [path pred val via in] :as problem}]
+  ;; (prn "interpret-problem" problem)
+  (cond
+    (and (empty? path)
+         (list? pred)
+         (= (first (last pred)) 'cljs.core/contains?))
+    (let [path (conj path (last (last pred)))]
+      (assoc-in acc path {:name ::missing :type :builtin}))
+
+    (and (not (empty? path))
+         (not (empty? via)))
+    (assoc-in acc path {:name (last via) :type :builtin})
+
+    :else acc))
+
+(defn use-form
+  [spec initial]
+  (let [[state update-state] (mf/useState {:data (if (fn? initial) (initial) initial)
+                                           :errors {}
+                                           :touched {}})
+        clean-data (s/conform spec (:data state))
+        problems (when (= ::s/invalid clean-data)
+                   (::s/problems (s/explain-data spec (:data state))))
+
+
+        errors (merge (reduce interpret-problem {} problems)
+                      (:errors state))]
+    (-> (assoc state
+               :errors errors
+               :clean-data (when (not= clean-data ::s/invalid) clean-data)
+               :valid (and (empty? errors)
+                           (not= clean-data ::s/invalid)))
+        (impl-mutator update-state))))
+
+(defn on-input-change
+  [{:keys [data] :as form} field]
+  (fn [event]
+    (let [target (dom/get-target event)
+          value (dom/get-value target)]
+      (swap! form (fn [state]
+                    (-> state
+                        (assoc-in [:data field] value)
+                        (update :errors dissoc field)))))))
+
+(defn on-input-blur
+  [{:keys [touched] :as form} field]
+  (fn [event]
+    (let [target (dom/get-target event)]
+      (when-not (get touched field)
+        (swap! form assoc-in [:touched field] true)))))
+
+;; --- Helper Components
+
+(mf/defc field-error
+  [{:keys [form field type]
+    :or {only (constantly true)}
+    :as props}]
+  (let [touched? (get-in form [:touched field])
+        {:keys [message code] :as error} (get-in form [:errors field])]
+    (when (and touched? error
+               (cond
+                 (nil? type) true
+                 (keyword? type) (= (:type error) type)
+                 (ifn? type) (type (:type error))
+                 :else false))
+      (prn "field-error" error)
+      [:ul.form-errors
+       [:li {:key code} (tr message)]])))
+
+(defn error-class
+  [form field]
+  (when (and (get-in form [:errors field])
+             (get-in form [:touched field]))
+    "invalid"))
+
+;; --- Form Validation Api
+
+;; --- Form Specs and Conformers
+
+(def ^:private email-re
+  #"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$")
+
+(def ^:private number-re
+  #"^[-+]?[0-9]*\.?[0-9]+$")
+
+(def ^:private color-re
+  #"^#[0-9A-Fa-f]{6}$")
+
+(s/def ::email
+  (s/and string? #(boolean (re-matches email-re %))))
+
+(s/def ::not-empty-string
+  (s/and string? #(not (str/empty? %))))
+
+(defn- parse-number
+  [v]
+  (cond
+    (re-matches number-re v) (js/parseFloat v)
+    (number? v) v
+    :else ::s/invalid))
+
+(s/def ::string-number
+  (s/conformer parse-number str))
+
+(s/def ::color
+  (s/and string? #(boolean (re-matches color-re %))))
diff --git a/frontend/src/uxbox/util/messages.cljs b/frontend/src/uxbox/util/messages.cljs
index edd1103d4..f5d50a987 100644
--- a/frontend/src/uxbox/util/messages.cljs
+++ b/frontend/src/uxbox/util/messages.cljs
@@ -25,11 +25,34 @@
 
 (def +animation-timeout+ 600)
 
-;; --- Message Event
+;; --- Main API
 
 (declare hide)
+(declare show)
 (declare show?)
 
+(defn error
+  [message & {:keys [timeout] :or {timeout 3000}}]
+  (show {:content message
+         :type :error
+         :timeout timeout}))
+
+(defn info
+  [message & {:keys [timeout] :or {timeout 3000}}]
+  (show {:content message
+         :type :info
+         :timeout timeout}))
+
+(defn dialog
+  [message & {:keys [on-accept on-cancel]}]
+  (show {:content message
+         :on-accept on-accept
+         :on-cancel on-cancel
+         :timeout js/Number.MAX_SAFE_INTEGER
+         :type :dialog}))
+
+;; --- Show Event
+
 (defn show
   [data]
   (reify
@@ -53,47 +76,19 @@
   [v]
   (= ::show (ptk/type v)))
 
-(defn error
-  [message & {:keys [timeout] :or {timeout 3000}}]
-  (show {:content message
-         :type :error
-         :timeout timeout}))
-
-(defn info
-  [message & {:keys [timeout] :or {timeout 3000}}]
-  (show {:content message
-         :type :info
-         :timeout timeout}))
-
-(defn dialog
-  [message & {:keys [on-accept on-cancel]}]
-  (show {:content message
-         :on-accept on-accept
-         :on-cancel on-cancel
-         :timeout js/Number.MAX_SAFE_INTEGER
-         :type :dialog}))
-
-;; --- Hide Message
+;; --- Hide Event
 
 (defn hide
   []
-  (let [canceled? (volatile! {})]
-    (reify
-      ptk/UpdateEvent
-      (update [_ state]
-        (update state :message
-                (fn [v]
-                  (if (nil? v)
-                    (do (vreset! canceled? true) nil)
-                    (assoc v :state :hide)))))
-
-      ptk/WatchEvent
-      (watch [_ state stream]
-        (if @canceled?
-          (rx/empty)
-          (->> (rx/of #(dissoc % :message))
-               (rx/delay +animation-timeout+)))))))
+  (reify
+    ptk/UpdateEvent
+    (update [_ state]
+      (update state :message assoc :state :hide))
 
+    ptk/WatchEvent
+    (watch [_ state stream]
+      (->> (rx/of #(dissoc % :message))
+           (rx/delay +animation-timeout+)))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; UI Components
@@ -145,6 +140,7 @@
 
 (mf/defc messages-widget
   [{:keys [message] :as props}]
+  (prn "messages-widget" props)
   (case (:type message)
     :error (mf/element notification-box props)
     :info (mf/element notification-box props)
diff --git a/frontend/src/uxbox/util/spec.cljs b/frontend/src/uxbox/util/spec.cljs
index 070824a79..592cbf11a 100644
--- a/frontend/src/uxbox/util/spec.cljs
+++ b/frontend/src/uxbox/util/spec.cljs
@@ -42,6 +42,12 @@
 (s/def ::uuid uuid?)
 (s/def ::email email?)
 (s/def ::color color?)
+(s/def ::string string?)
+(s/def ::number number?)
+(s/def ::positive pos?)
+(s/def ::inst inst?)
+(s/def ::keyword keyword?)
+(s/def ::fn fn?)
 
 ;; --- Public Api