diff --git a/app/src/main/java/com/github/gotify/init/InitializationActivity.java b/app/src/main/java/com/github/gotify/init/InitializationActivity.java
new file mode 100644
index 0000000..7acaa70
--- /dev/null
+++ b/app/src/main/java/com/github/gotify/init/InitializationActivity.java
@@ -0,0 +1,125 @@
+package com.github.gotify.init;
+
+import android.app.NotificationManager;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+import android.os.Bundle;
+
+import com.github.gotify.NotificationSupport;
+import com.github.gotify.R;
+import com.github.gotify.Settings;
+import com.github.gotify.api.Api;
+import com.github.gotify.api.Callback;
+import com.github.gotify.api.ClientFactory;
+import com.github.gotify.client.ApiException;
+import com.github.gotify.client.api.VersionApi;
+import com.github.gotify.client.model.User;
+import com.github.gotify.client.model.VersionInfo;
+import com.github.gotify.log.Log;
+import com.github.gotify.log.UncaughtExceptionHandler;
+import com.github.gotify.login.LoginActivity;
+import com.github.gotify.messages.MessagesActivity;
+import com.github.gotify.service.WebSocketService;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
+public class InitializationActivity extends AppCompatActivity {
+    private Settings settings;
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Log.init(this);
+        setContentView(R.layout.splash);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationSupport.createChannels(
+                    (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE));
+        }
+
+        UncaughtExceptionHandler.registerCurrentThread();
+        settings = new Settings(this);
+        Log.i("Entering " + getClass().getSimpleName());
+
+        if (settings.tokenExists()) {
+            tryAuthenticate();
+        } else {
+            showLogin();
+        }
+    }
+
+    private void showLogin() {
+        startActivity(new Intent(this, LoginActivity.class));
+        finish();
+    }
+
+    private void tryAuthenticate() {
+        Api.withLogging(ClientFactory.userApiWithToken(settings)::currentUserAsync)
+                .handleInUIThread(this, this::authenticated, this::failed);
+    }
+
+    private void failed(ApiException exception) {
+        if (exception.getCode() == 0) {
+            dialog(getString(R.string.not_available, settings.url()));
+            return;
+        }
+
+        if (exception.getCode() == 401) {
+            dialog(getString(R.string.auth_failed));
+            return;
+        }
+
+        String response = exception.getResponseBody();
+        response = response.substring(0, Math.min(200, response.length()));
+        dialog(getString(R.string.other_error, settings.url(), exception.getCode(), response));
+    }
+
+    private void dialog(String message) {
+        new AlertDialog.Builder(this)
+                .setTitle(R.string.oops)
+                .setMessage(message)
+                .setPositiveButton(R.string.retry, (a, b) -> tryAuthenticate())
+                .setNegativeButton(R.string.logout, (a, b) -> showLogin())
+                .show();
+    }
+
+    private void authenticated(User user) {
+        Log.i("Authenticated as " + user.getName());
+
+        settings.user(user.getName(), user.isAdmin());
+        requestVersion(
+                () -> {
+                    startActivity(new Intent(this, MessagesActivity.class));
+                    finish();
+                });
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            startForegroundService(new Intent(this, WebSocketService.class));
+        } else {
+            startService(new Intent(this, WebSocketService.class));
+        }
+    }
+
+    private void requestVersion(Runnable runnable) {
+        requestVersion(
+                (version) -> {
+                    Log.i("Server version: " + version.getVersion() + "@" + version.getBuildDate());
+                    settings.serverVersion(version.getVersion());
+                    runnable.run();
+                },
+                (e) -> {
+                    runnable.run();
+                });
+    }
+
+    private void requestVersion(
+            final Callback.SuccessCallback<VersionInfo> callback,
+            final Callback.ErrorCallback errorCallback) {
+        VersionApi versionApi = ClientFactory.versionApi(settings.url());
+        Api.withLogging(versionApi::getVersionAsync)
+                .handleInUIThread(this, callback, errorCallback);
+    }
+}
diff --git a/app/src/main/res/layout/splash.xml b/app/src/main/res/layout/splash.xml
new file mode 100644
index 0000000..758cf40
--- /dev/null
+++ b/app/src/main/res/layout/splash.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/drawer_layout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fitsSystemWindows="true"
+    tools:openDrawer="start">
+
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginStart="32dp"
+        android:layout_marginTop="32dp"
+        android:layout_marginEnd="32dp"
+        android:layout_marginBottom="32dp"
+        android:src="@drawable/gotify"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>