Supabase Auth UI for React Native (Free, Secure)

Supabase is a popular open-source backend, and its Auth handles the hard parts of sign-up, login, sessions, social logins, and password resets, so you do not roll your own. The short answer is, design clean auth screens (welcome, sign in, sign up, reset) from a free VP0 design, wire them to Supabase Auth for the actual identity work, and store the session securely rather than handling raw credentials yourself. Auth is one of the two riskiest parts of any app, so the rule is: build the UI, delegate the security.

Why delegate auth to Supabase

Authentication is where mistakes leak everything, and roughly 71% of mobile apps were found to leak sensitive data, often through auth and token handling. Building your own auth (hashing, session management, social logins, resets) is a lot of surface to get wrong. Supabase Auth handles it for you: email/password, magic links, OAuth providers, and Sign in with Apple, returning a session your app stores and uses. Your job shrinks to a clean UI and secure session storage. Note that if you offer other social logins on iOS, Apple requires offering Sign in with Apple too, which Supabase supports.

How to build Supabase auth screens

VP0 is a free iOS design library for AI builders. Pick welcome, sign-in, sign-up, and reset designs, copy the links, and have Cursor or Claude Code build them in React Native: a welcome with provider buttons, an email/password form with clear validation and error states, and a password-reset flow. Wire each to Supabase Auth’s client methods, and store the returned session token securely (the Keychain via secure storage, not plain AsyncStorage). Never store raw passwords; Supabase handles credentials. Add Sign in with Apple if you offer other social logins. For a starter that bundles auth, see React Native boilerplate with auth and payments UI.

Auth UI building blocks

Here is what each part should do.

Part	What to get right
Welcome	Clear provider and email options
Sign in / up	Validation, honest error states
Password reset	Simple, reassuring flow
Session storage	Secure (Keychain), not plain
Sign in with Apple	Offer it if you offer socials

A worked example

Say you build a notes app needing accounts. From VP0 designs, build a welcome (Continue with Apple, Continue with Google, or email), an email sign-in/sign-up form with inline validation and clear errors, and a reset flow. Call Supabase Auth for each action; on success, store the session token in secure storage and route into the app. Never touch raw passwords, Supabase handles them. Add Sign in with Apple since you offer Google. Show a clear loading state while Supabase verifies, and a specific message on failure, so users are never left wondering whether sign-in worked. For the data layer behind the app, see server-driven UI JSON to React Native examples, and for a finance app needing the same auth, Binance-style crypto exchange UI. A project .cursorrules file helps keep AI-generated auth code consistent and free of hardcoded secrets.

Common mistakes

The most common mistake is rolling your own auth instead of delegating to a service like Supabase, a large risk for little benefit. The second is storing the session token in plain storage instead of the Keychain. The third is storing or logging raw passwords, which you should never see. The fourth is offering Google or Facebook login on iOS without Sign in with Apple, which fails review. The fifth is vague error states, leaving users stuck when login fails.

Key takeaways

• Delegate auth to Supabase Auth; do not roll your own, since auth is where leaks happen (around 71% of apps leak).
• Build clean welcome, sign-in, sign-up, and reset screens from a free VP0 design.
• Store the session securely (Keychain), never raw passwords or plain-storage tokens.
• Offer Sign in with Apple if you offer other social logins on iOS, which Supabase supports.

Frequently asked questions

How do I build a Supabase auth UI in React Native? Design welcome, sign-in, sign-up, and reset screens from a free VP0 design, wire each to Supabase Auth’s client methods, and store the returned session token in secure storage. Supabase handles credentials; you build the UI.

Should I build my own authentication? No. Auth is one of the riskiest parts of an app; delegate it to a service like Supabase Auth that handles hashing, sessions, social logins, and resets. Building your own is a large surface to get wrong.

Where do I store the session token? In secure storage (the Keychain via a secure-storage library), not plain AsyncStorage. And never store or log raw passwords, since Supabase handles credentials.

Do I need Sign in with Apple? If you offer other social logins (Google, Facebook) on iOS, Apple requires offering Sign in with Apple too. Supabase supports it, so add it to your provider options.