Firebase Authentication vs Supabase Auth for Google login

Here’s the practical comparison for Google login specifically:

Short answer

• Choose Firebase Auth if you want the most polished, low-friction Google sign-in with excellent mobile support and minimal setup.
• Choose Supabase Auth if you want Auth + Postgres + backend ownership in one stack, and you’re okay with a bit more configuration and occasional edge-case handling.

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Firebase Authentication for Google login

Pros

• Very easy to set up for Google OAuth
• Excellent SDKs for web, iOS, Android, Flutter
• Mature, stable, widely used
• Good UX for sign-in flows
• Strong support for anonymous auth, phone auth, and many provider integrations

Cons

• More tied to Google ecosystem / Firebase platform
• Data lives outside your database, so auth + app data are separate systems
• Less flexible if you want everything in SQL and self-managed backend logic
• Pricing/usage can become less predictable at scale depending on your architecture

Best for

• Mobile apps
• Quick MVPs
• Teams that want the least auth complexity
• Apps already using Firebase services

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Supabase Auth for Google login

Pros

• Auth integrated with Postgres
• Good fit if your app data is already in Supabase
• Easier to use Row Level Security (RLS) with auth
• Open-source-ish, more portable stack
• Good for backend-centric apps and SQL-first workflows

Cons

• Google OAuth setup can be a little more manual than Firebase
• SDKs are good, but Firebase’s auth experience is generally more mature
• Some auth edge cases can require more hands-on debugging
• If you need advanced identity features, Firebase may feel smoother

Best for

• Web apps with Postgres
• Apps that need tight auth + database authorization
• Teams that want a more open backend stack
• SaaS products with SQL/RLS-based permissions

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For Google login specifically

If your main requirement is just:

• “Users sign in with Google”
• “I want it to work reliably”
• “I want the easiest developer experience”

Firebase Auth usually wins.

If your requirement is:

• “I want Google login, but also tight integration with my database permissions”
• “I want auth to be part of my SQL backend”
• “I’m building a SaaS app using Postgres and RLS”

Supabase Auth is often the better architectural fit.

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Recommendation by scenario

Pick Firebase if:

• You’re building a mobile app
• You want the fastest setup
• You don’t want to manage auth/database coupling
• You want mature SDKs and UX

Pick Supabase if:

• You already use Postgres
• You want auth tied directly to your database rows
• You prefer a more open, SQL-first stack
• You’re building a web SaaS app

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My opinion

For Google login alone, Firebase is slightly better and smoother.

For Google login as part of a full app stack, Supabase can be better if you want auth, database, and access control to work together naturally.

If you want, I can also give you:

1. a feature-by-feature table,
2. a cost comparison, or
3. a recommendation for your specific app stack.