diff --git a/app/src/main/java/com/github/gotify/messages/MessagesActivity.java b/app/src/main/java/com/github/gotify/messages/MessagesActivity.java
index 0b680a1b..e873a2bc 100644
--- a/app/src/main/java/com/github/gotify/messages/MessagesActivity.java
+++ b/app/src/main/java/com/github/gotify/messages/MessagesActivity.java
@@ -43,8 +43,10 @@
 import com.github.gotify.Utils;
 import com.github.gotify.api.Api;
 import com.github.gotify.api.ApiException;
+import com.github.gotify.api.Callback;
 import com.github.gotify.api.ClientFactory;
 import com.github.gotify.client.ApiClient;
+import com.github.gotify.client.api.ApplicationApi;
 import com.github.gotify.client.api.ClientApi;
 import com.github.gotify.client.api.MessageApi;
 import com.github.gotify.client.model.Application;
@@ -60,6 +62,7 @@
 import com.github.gotify.messages.provider.MessageState;
 import com.github.gotify.messages.provider.MessageWithImage;
 import com.github.gotify.picasso.PicassoHandler;
+import com.github.gotify.service.MessagingDatabase;
 import com.github.gotify.service.WebSocketService;
 import com.github.gotify.settings.SettingsActivity;
 import com.github.gotify.sharing.ShareActivity;
@@ -171,6 +174,7 @@ public void onDrawerClosed(View drawerView) {
                             new SelectApplicationAndUpdateMessages(true)
                                     .execute(selectAppIdOnDrawerClose);
                             selectAppIdOnDrawerClose = null;
+                            invalidateOptionsMenu();
                         }
                     }
                 });
@@ -192,6 +196,10 @@ public void onDrawerClosed(View drawerView) {
     }
 
     public void onRefreshAll(View view) {
+        refreshAll();
+    }
+
+    public void refreshAll() {
         try {
             picassoHandler.evict();
         } catch (IOException e) {
@@ -560,6 +568,7 @@ protected void onPostExecute(Boolean update) {
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.messages_action, menu);
+        menu.findItem(R.id.action_delete_app).setVisible(appId != MessageState.ALL_MESSAGES);
         return super.onCreateOptionsMenu(menu);
     }
 
@@ -568,9 +577,36 @@ public boolean onOptionsItemSelected(MenuItem item) {
         if (item.getItemId() == R.id.action_delete_all) {
             new DeleteMessages().execute(appId);
         }
+        if (item.getItemId() == R.id.action_delete_app) {
+            android.app.AlertDialog.Builder alert = new android.app.AlertDialog.Builder(this);
+            alert.setTitle(R.string.delete_app);
+            alert.setMessage(R.string.ack);
+            alert.setPositiveButton(R.string.yes, (dialog, which) -> deleteApp(appId));
+            alert.setNegativeButton(R.string.no, (dialog, which) -> dialog.dismiss());
+            alert.show();
+        }
         return super.onContextItemSelected(item);
     }
 
+    private void deleteApp(Long appId) {
+        MessagingDatabase db = new MessagingDatabase(this);
+        db.forceUnregisterApp(appId);
+        db.close();
+
+        ApiClient client =
+                ClientFactory.clientToken(settings.url(), settings.sslSettings(), settings.token());
+
+        client.createService(ApplicationApi.class)
+                .deleteApp(appId)
+                .enqueue(
+                        Callback.callInUI(
+                                this,
+                                (ignored) -> refreshAll(),
+                                (e) ->
+                                        Utils.showSnackBar(
+                                                this, getString(R.string.error_delete_app))));
+    }
+
     private class LoadMore extends AsyncTask<Long, Void, List<MessageWithImage>> {
 
         @Override
diff --git a/app/src/main/java/com/github/gotify/service/MessagingDatabase.kt b/app/src/main/java/com/github/gotify/service/MessagingDatabase.kt
index 71571f93..3f4b01ec 100644
--- a/app/src/main/java/com/github/gotify/service/MessagingDatabase.kt
+++ b/app/src/main/java/com/github/gotify/service/MessagingDatabase.kt
@@ -47,10 +47,10 @@ class MessagingDatabase(context: Context) : SQLiteOpenHelper(context, DB_NAME, n
         db.delete(TABLE_APPS,selection,selectionArgs)
     }
 
-    fun forceUnregisterApp(packageName: String){
+    fun forceUnregisterApp(appId: Long){
         val db = writableDatabase
-        val selection = "$FIELD_PACKAGE_NAME = ?"
-        val selectionArgs = arrayOf(packageName)
+        val selection = "$FIELD_APP_ID = ?"
+        val selectionArgs = arrayOf(appId.toString())
         db.delete(TABLE_APPS,selection,selectionArgs)
     }
 
diff --git a/app/src/main/res/menu/messages_action.xml b/app/src/main/res/menu/messages_action.xml
index 3aa89356..5382c587 100644
--- a/app/src/main/res/menu/messages_action.xml
+++ b/app/src/main/res/menu/messages_action.xml
@@ -3,4 +3,8 @@
         android:title="@string/delete_all"
         android:id="@+id/action_delete_all"
         android:orderInCategory="100"/>
+    <item
+        android:title="@string/delete_app"
+        android:id="@+id/action_delete_app"
+        android:orderInCategory="101"/>
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 39c28489..5b07d3d9 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -25,6 +25,8 @@
     <string name="websocket_closed_try_reconnect">Connection closed, trying to establish a new one.</string>
     <string name="grouped_message">Received %d messages while being disconnected</string>
     <string name="delete_all">Delete all</string>
+    <string name="delete_app">Delete this application</string>
+    <string name="error_delete_app">Could not delete this app</string>
     <string name="delete_logs">Delete logs</string>
     <string name="copy_logs">Copy logs</string>
     <string name="logs_copied">Logs copied</string>
@@ -48,6 +50,8 @@
     <string name="refresh_all">Refresh all</string>
     <string name="logout_confirm">Do you really want to logout?</string>
     <string name="yes">Yes</string>
+    <string name="no">No</string>
+    <string name="ack">Are you sure?</string>
     <string name="missed_messages">Missed messages</string>
     <string name="grouped_notification_text">New Messages</string>
     <string name="websocket_listening">Listening to %s</string>