diff --git a/browser/lib/Mutable.js b/browser/lib/Mutable.js
index c7aa213d..bcf39275 100644
--- a/browser/lib/Mutable.js
+++ b/browser/lib/Mutable.js
@@ -1,6 +1,12 @@
 class MutableMap {
   constructor (iterable) {
     this._map = new Map(iterable)
+    Object.defineProperty(this, 'size', {
+      get: () => this._map.size,
+      set: function (value) {
+        this['size'] = value
+      }
+    })
   }
 
   get (...args) {
@@ -54,6 +60,12 @@ class MutableMap {
 class MutableSet {
   constructor (iterable) {
     this._set = new Set(iterable)
+    Object.defineProperty(this, 'size', {
+      get: () => this._map.size,
+      set: function (value) {
+        this['size'] = value
+      }
+    })
   }
 
   add (...args) {
diff --git a/browser/main/lib/mixpanel.js b/browser/main/lib/mixpanel.js
index 3fe157d4..5fd54b90 100644
--- a/browser/main/lib/mixpanel.js
+++ b/browser/main/lib/mixpanel.js
@@ -1,8 +1,11 @@
+import store from 'browser/main/store'
+
 const _ = require('lodash')
 const keygen = require('browser/lib/keygen')
 const Mixpanel = require('mixpanel')
 const mixpanel = Mixpanel.init('7a0aca437d72dfd07cbcbf58d3b61f27', {key: 'fde4fd23f4d550f1b646bcd7d4374b1f'})
 const moment = require('moment')
+const electron = require('electron')
 
 function _getClientKey () {
   let clientKey = localStorage.getItem('clientKey')
@@ -84,6 +87,13 @@ function _flush () {
         _flush()
       }
     })
+
+    let state = store.getState()
+    mixpanel.people.set(_getClientKey(), {
+      storage_count: state.data.storageMap.size,
+      note_count: state.data.noteMap.size,
+      version: electron.remote.app.getVersion()
+    })
   }
 }