Firebase Authentication vs Supabase Auth for social login

Here’s the practical comparison for social login between Firebase Authentication and Supabase Auth.

Quick take

• Firebase Auth: best if you want the most polished, mature, and low-friction social login experience with broad provider support and very little setup.
• Supabase Auth: best if you want auth tightly integrated with Postgres and your own backend/data stack, and you’re okay with a bit more setup/limitations.

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Social login support

Firebase Authentication

Supports many social providers out of the box, including:

• Google
• Apple
• Facebook
• Twitter/X
• GitHub
• Microsoft
• Yahoo
• LinkedIn
• Phone auth, anonymous auth, etc.

Strengths for social login:

• Very mature provider integrations
• Good docs and examples
• Easy SDK flows on web/mobile
• Smooth account linking and popup/redirect flows

Supabase Auth

Supports:

• Google
• GitHub
• Facebook
• Apple
• Azure
• Discord
• GitLab
• Bitbucket
• Twitter/X
• LinkedIn
• Slack
• Dropbox
• Notion
• Zoom
• and more via custom OIDC/OAuth setup

Strengths for social login:

• Good standard OAuth support
• More flexible if you want to use your own auth/database architecture
• Easy to store user data directly in Postgres

Caveat: provider setup can be a little more hands-on, and some provider-specific flows may be less smooth than Firebase.

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Developer experience

Firebase Auth

Pros

• Very easy to get started
• SDKs are polished
• Good error handling and provider linking patterns
• Strong mobile support

Cons

• Can feel tied into the broader Firebase ecosystem
• Some auth behaviors are more opinionated
• Advanced customization can be awkward

Supabase Auth

Pros

• Great if you’re already using Supabase/Postgres
• JWT-based auth fits well with custom APIs
• Nice for row-level security workflows

Cons

• Less “plug-and-play” than Firebase for some social providers
• Smaller ecosystem and fewer battle-tested edge cases
• Mobile/social login setups may require a bit more manual work

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Backend/data integration

Firebase Auth

• Works best with Firebase services
• If your app is already on Firestore/Functions/Storage, auth integrates nicely
• If you use your own backend, you’ll often verify Firebase JWTs there

Supabase Auth

• Auth is built around Postgres and RLS
• Very natural if your app data lives in Postgres
• Easier to enforce database-level authorization policies

If your app is data-centric and you want auth to directly govern SQL access, Supabase has a big advantage.

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Account linking and identity management

Firebase Auth

• Strong account linking support
• Good for apps where users may sign in with multiple providers
• Mature handling of provider collisions

Supabase Auth

• Supports multiple providers per user too
• Works well for standard cases
• In some edge cases, identity linking can be less ergonomic than Firebase

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Customization and control

Firebase Auth

• More managed, less flexible
• Good if you want simplicity over control

Supabase Auth

• More aligned with open web standards and your own stack
• Better if you want to own more of the auth/data boundary

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Pricing

This changes over time, but generally:

Firebase Auth

• Very cost-effective for many apps
• Pricing can become relevant depending on MAUs and provider usage patterns
• Strong free tier for many use cases

Supabase Auth

• Auth is included with Supabase projects
• Pricing depends more on overall Supabase usage
• Good value if you already need Supabase for database/storage

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Which should you choose?

Choose Firebase Auth if:

• You want the easiest social login setup
• You need excellent mobile support
• You want a battle-tested auth product
• You’re already using Firebase services

Choose Supabase Auth if:

• You want auth integrated with Postgres
• You care about row-level security and database-native authorization
• You prefer an open, backend-friendly architecture
• You’re already using Supabase for your DB

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Bottom line

• Best pure social login UX / maturity: Firebase Auth
• Best if your app is built around Postgres and custom backend logic: Supabase Auth

If you want, I can also give you:

1. a feature-by-feature table,
2. a recommendation for web vs mobile, or
3. a setup guide for Google login in both.