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Google Sign-In

Let people sign in to your app with the Google account they already have: one tap instead of yet another password. Nowa stores your Google client IDs and prepares your iPhone and iPad app for Google's sign-in screen. This setup is for sign-in without Firebase, for example with Supabase. If you use Firebase Authentication, Firebase handles Google sign-in instead (see Sign users in with Firebase).

Before you start​

Create your client IDs in Google Cloud​

A client ID tells Google which app is asking to sign someone in. You create one for each kind of app, all in the same Google Cloud project:

  1. In the Google Cloud console, open the Google Auth Platform Clients page. If Google asks, create a project and register your app for Google sign-in first.
  2. Click CREATE CLIENT, choose Web application, give it a name and click CREATE. Copy the client ID. Google shows the client secret only now, so keep it somewhere safe if your backend asks for it.
  3. Click CREATE CLIENT again and choose iOS. Enter your Bundle Identifier as the bundle ID and click CREATE. Copy this client ID too.
  4. For Android, Supabase's guide has you create one more client of type Android, with your Bundle Identifier as the package name and the SHA-1 fingerprint of your signing key (Nowa shows it with a copy button, see Create a signing key). Once your app is on Google Play, create another Android client with the SHA-1 from the App signing key section of Play Console's app signing page, because Google signs the app people download with its own key. Nowa has no field for these: their client IDs go into Supabase with the others.

Google's Manage OAuth Clients help explains each client type, and Supabase's Login with Google guide covers the Supabase side, including the separate fingerprints for testing and publishing.

Add your client IDs in Nowa​

  1. Click the gear in the top bar (Settings) or press Ctrl/Cmd + ,. Under Integrations, click Google Sign-In.
  2. Turn on Enabled. Nowa adds what your app needs for Google sign-in.
  3. Under Configuration, paste your iOS Client ID and Web Client ID. Both look like xxxxx.apps.googleusercontent.com. Press Enter or click the send icon (Submit) after each one. A check mark confirms the save.
FieldWhat it's for
iOS Client IDLets Google's sign-in screen open from your iPhone and iPad app and come back to it. Needed for Google sign-in without Firebase.
Web Client IDLets your backend, such as Supabase, check who signed in. Its help text says it's also used as the server client ID on Android. It shows on the Constants page too. Nowa only stores it: the sign-in flow you build with Nowa AI uses it.

Also using a URL Scheme for deep links? Both settings add a link entry to your iPhone app, so read Use deep links with Google Sign-In before you test on iOS.

Build the sign-in flow​

Nowa stores your client IDs and prepares your app, but it doesn't create a sign-in function or a Google button for this setup. That's the part Nowa AI builds for you. With Supabase, connect your project and turn on Google in Supabase first, then ask.

Or ask Nowa AI

In Agent mode, try: "Add a Continue with Google button to the Login screen that signs the user in with Supabase." Then check Problems for errors and try the button in your app on a device.

When Firebase manages Google sign-in​

If your project is connected to Firebase and Nowa has saved a Google client ID from it, this page shows Managed by Firebase ("Google Sign-In is configured through Firebase Authentication. To modify settings, go to Firebase settings.") and an Open Firebase Settings button. The Enabled switch and the fields are hidden. Change the setup in the Firebase settings instead.

Nowa saves that client ID when it sets Firebase up for your project and your Firebase project has Google sign-in turned on, for example when you connect Firebase or add the Google provider in Firebase Authentication. Firebase's Google sign-in adds the same link entry to your iPhone app, so if you also use a URL Scheme, read Use deep links with Google Sign-In too.

Turn Google Sign-In off​

Turn Enabled off. Nowa takes the Google sign-in setup out of your iPhone and iPad app. Your Web Client ID stays on the Constants page, under Custom Constants as webClientId. Working in the code? See What Nowa adds to your code.

Next steps​