diff --git a/libs/horizon/src/external/devtools.ts b/libs/horizon/src/external/devtools.ts
index 1fb1af9b..9e8295cb 100644
--- a/libs/horizon/src/external/devtools.ts
+++ b/libs/horizon/src/external/devtools.ts
@@ -39,7 +39,7 @@ export const helper = {
       return { name: HookName.RefHook, hIndex, value: (state as Ref<any>).current };
     } else if (isEffectHook(state)) {
       const name =
-        state.effectConstant == EffectConstant.LayoutEffect || (EffectConstant.LayoutEffect | EffectConstant.DepsChange)
+        state.effectConstant == EffectConstant.LayoutEffect || EffectConstant.LayoutEffect | EffectConstant.DepsChange
           ? HookName.LayoutEffectHook
           : HookName.EffectHook;
       return { name, hIndex, value: (state as Effect).effect };
diff --git a/libs/horizon/src/horizonx/devtools/constants.ts b/libs/horizon/src/horizonx/devtools/constants.ts
new file mode 100644
index 00000000..df41626f
--- /dev/null
+++ b/libs/horizon/src/horizonx/devtools/constants.ts
@@ -0,0 +1,8 @@
+export const INITIALIZED = 'horizonx store initialized';
+export const STATE_CHANGE = 'horizonx state change';
+export const SUBSCRIBED = 'horizonx subscribed';
+export const UNSUBSCRIBED = 'horizonx unsubscribed';
+export const ACTION = 'horizonx action';
+export const ACTION_QUEUED = 'horizonx action queued';
+export const QUEUE_PENDING = 'horizonx queue pending';
+export const QUEUE_FINISHED = 'horizonx queue finished';
diff --git a/libs/horizon/src/horizonx/devtools/index.ts b/libs/horizon/src/horizonx/devtools/index.ts
new file mode 100644
index 00000000..884daabf
--- /dev/null
+++ b/libs/horizon/src/horizonx/devtools/index.ts
@@ -0,0 +1,51 @@
+const sessionId = Date.now();
+
+function makeStoreSnapshot({ type, data }) {
+  const expanded = {};
+  Object.keys(data.store.$c).forEach(key => {
+    expanded[key] = data.store[key];
+  });
+  data.store.expanded = expanded;
+  const snapshot = makeProxySnapshot({
+    data,
+    type,
+    sessionId,
+  });
+  return snapshot;
+}
+
+function makeProxySnapshot(obj) {
+  let clone;
+  try {
+    if (!obj) {
+      return obj;
+    }
+    if (obj.nativeEvent) return obj.type + 'Event';
+    if (typeof obj === 'function') {
+      return obj.toString();
+    }
+    if (Array.isArray(obj)) {
+      clone = [];
+      obj.forEach(item => clone.push(makeProxySnapshot(item)));
+      return clone;
+    } else if (typeof obj === 'object') {
+      clone = {};
+      Object.entries(obj).forEach(([id, value]) => (clone[id] = makeProxySnapshot(value)));
+      return clone;
+    }
+    return obj;
+  } catch (err) {
+    throw console.log('cannot serialize object. ' + err);
+  }
+}
+
+export const devtools = {
+  emit: (type, data) => {
+    console.log('store snapshot:', makeStoreSnapshot({ type, data }));
+    window.postMessage({
+      type: 'HORIZON_DEV_TOOLS',
+      payload: makeStoreSnapshot({ type, data }),
+      from: 'dev tool hook',
+    });
+  },
+};
diff --git a/libs/horizon/src/horizonx/store/StoreHandler.ts b/libs/horizon/src/horizonx/store/StoreHandler.ts
index f8055275..af44a17f 100644
--- a/libs/horizon/src/horizonx/store/StoreHandler.ts
+++ b/libs/horizon/src/horizonx/store/StoreHandler.ts
@@ -6,6 +6,23 @@ import readonlyProxy from '../proxy/readonlyProxy';
 import { Observer } from '../proxy/Observer';
 import { FunctionComponent, ClassComponent } from '../Constants';
 import { VNode } from '../../renderer/Types';
+import { devtools } from '../devtools';
+import {
+  ACTION,
+  ACTION_QUEUED,
+  INITIALIZED,
+  QUEUE_FINISHED,
+  STATE_CHANGE,
+  SUBSCRIBED,
+  UNSUBSCRIBED,
+} from '../devtools/constants';
+
+const idGenerator = {
+  id: 0,
+  get: function (prefix) {
+    return prefix.toString() + this.id++;
+  },
+};
 
 const storeMap = new Map<string, StoreHandler<any, any, any>>();
 
@@ -73,7 +90,7 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
 ): () => StoreHandler<S, A, C> {
   //create a local shalow copy to ensure consistency (if user would change the config object after store creation)
   config = {
-    id: config.id,
+    id: config.id || idGenerator.get('UNKNOWN_STORE_'),
     /* @ts-ignore*/
     options: config.options,
     state: config.state,
@@ -92,10 +109,12 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
   proxyObj.$pending = false;
 
   const $subscribe = listener => {
+    devtools.emit(SUBSCRIBED, { store: handler, listener });
     proxyObj.addListener(listener);
   };
 
   const $unsubscribe = listener => {
+    devtools.emit(UNSUBSCRIBED, handler);
     proxyObj.removeListener(listener);
   };
 
@@ -115,11 +134,13 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
 
   function tryNextAction() {
     if (!plannedActions.length) {
+      devtools.emit(QUEUE_FINISHED, { store: handler });
       proxyObj.$pending = false;
       return;
     }
 
     const nextAction = plannedActions.shift()!;
+    devtools.emit(ACTION, { store: handler, action: nextAction, fromQueue: true });
     const result = config.actions
       ? config.actions[nextAction.action].bind(handler, proxyObj)(...nextAction.payload)
       : undefined;
@@ -139,6 +160,14 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
   if (config.actions) {
     Object.keys(config.actions).forEach(action => {
       ($queue as any)[action] = (...payload) => {
+        devtools.emit(ACTION_QUEUED, {
+          store: handler,
+          action: {
+            action,
+            payload,
+          },
+          fromQueue: true,
+        });
         return new Promise(resolve => {
           if (!proxyObj.$pending) {
             proxyObj.$pending = true;
@@ -164,6 +193,14 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
       };
 
       ($a as any)[action] = function Wrapped(...payload) {
+        devtools.emit(ACTION, {
+          store: handler,
+          action: {
+            action,
+            payload,
+          },
+          fromQueue: false,
+        });
         return config.actions![action].bind(handler, proxyObj)(...payload);
       };
 
@@ -171,6 +208,14 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
       Object.defineProperty(handler, action, {
         writable: false,
         value: (...payload) => {
+          devtools.emit(ACTION, {
+            store: handler,
+            action: {
+              action,
+              payload,
+            },
+            fromQueue: false,
+          });
           return config.actions![action].bind(handler, proxyObj)(...payload);
         },
       });
@@ -204,6 +249,16 @@ export function createStore<S extends object, A extends UserActions<S>, C extend
     storeMap.set(config.id, handler);
   }
 
+  devtools.emit(INITIALIZED, {
+    store: handler,
+  });
+
+  handler.$subscribe(() => {
+    devtools.emit(STATE_CHANGE, {
+      store: handler,
+    });
+  });
+
   return createStoreHook(handler);
 }