diff --git a/app/scripts/app.js b/app/scripts/app.js
index 6dcaea4e..f7c52d60 100644
--- a/app/scripts/app.js
+++ b/app/scripts/app.js
@@ -33,6 +33,7 @@ ready(() => {
         .then(loadConfigs)
         .then(initModules)
         .then(loadRemoteConfig)
+        .then(ensureCanRun)
         .then(showApp)
         .catch(e => {
             appModel.appLogger.error('Error starting app', e);
@@ -43,6 +44,20 @@ ready(() => {
         require('./helpers');
     }
 
+    function ensureCanRun() {
+        return Promise.resolve()
+            .then(() => FeatureDetector.ensureCanRun())
+            .catch(e => {
+                Alerts.error({
+                    header: Locale.appSettingsError,
+                    body: Locale.appNotSupportedError,
+                    buttons: [],
+                    esc: false, enter: false, click: false
+                });
+                throw e;
+            });
+    }
+
     function loadConfigs() {
         return Promise.all([
             AppSettingsModel.instance.load(),
diff --git a/app/scripts/locales/base.json b/app/scripts/locales/base.json
index 40c27d13..e87eef89 100644
--- a/app/scripts/locales/base.json
+++ b/app/scripts/locales/base.json
@@ -287,6 +287,7 @@
   "appSaveErrorBodyMul": "Failed to auto-save files:",
   "appSettingsError": "Error loading app",
   "appSettingsErrorBody": "There was an error loading app settings. Please double check app url or contact your administrator.",
+  "appNotSupportedError": "Your browser is not supported.",
   "appTabWarn": "Too many tabs",
   "appTabWarnBody": "KeeWeb cannot be used in two browser tabs simultaneously, please close this tab.",
 
diff --git a/app/scripts/util/feature-detector.js b/app/scripts/util/feature-detector.js
index 2eb74540..bbaf385d 100644
--- a/app/scripts/util/feature-detector.js
+++ b/app/scripts/util/feature-detector.js
@@ -34,6 +34,18 @@ const FeatureDetector = {
     },
     hasUnicodeFlags: function() {
         return this.isMac;
+    },
+    ensureCanRun: function() {
+        if (/MSIE |Trident/.test(navigator.userAgent)) {
+            throw 'IE detected';
+        }
+        if (!localStorage.length) {
+            try {
+                localStorage.appSettings = '';
+            } catch (e) {
+                throw 'localStorage not available';
+            }
+        }
     }
 };
 
diff --git a/release-notes.md b/release-notes.md
index 9163f629..eebfdde4 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -4,6 +4,7 @@ Release notes
 `+` plugins  
 `*` translations are available only as plugins  
 `*` Dropbox API V2  
+`*` deprecated IE  
 `+` entry templates  
 `+` support cloud providers in iOS homescreen apps  
 `+` auto-type improvements and bugfixes  
@@ -17,6 +18,7 @@ Release notes
 `+` mac os window style options  
 `+` lock on hide mac os hide  
 `+` release distribution improvements  
+`+` error message for not supported browsers  
 `-` removed support of devices without clipboard api  
 
 ##### v1.4.1 (2017-03-26)