Supabase Auth vs Firebase Authentication (2026)
Head-to-head comparison for vibe coders: scores, free tiers, pricing and best-for, using the same evidence-based methodology. Rankings are never for sale.
Auth built into your Supabase Postgres, with 50,000 free MAU
Google's drop-in auth for web and mobile apps
Side-by-side comparison
| Criterion | Supabase Auth | Firebase Authentication |
|---|---|---|
| Score | 85/100 | 74/100 |
| Free tier | Yes: 50,000 monthly active users on the Supabase Free plan (free projects pause after 1 week of inactivity, 2 active projects max) | Yes: no-cost on the Spark plan; with Identity Platform free up to 50K MAU (Spark caps Identity Platform at 3,000 daily active users, and password-reset emails at 150/day) |
| Open source | Yes | No |
| Pricing | Included in Supabase plans: Free $0 (50,000 MAU); Pro from $25/mo (100,000 MAU, then $0.00325 per MAU); Team from $599/mo; Enterprise custom. Advanced phone MFA, SAML SSO and leaked-password protection are paid features | No-cost Spark plan; with Identity Platform, no-cost up to 50K MAU (50 MAU for SAML/OIDC), then Google Cloud pricing; phone verification SMS is Blaze (pay-as-you-go) only and billed per SMS |
| Best for | Apps already on Supabase, or vibe-coded apps from Lovable and Bolt that need sign-in tied to row-level security | Mobile and Flutter apps, or projects already on Firebase and Google Cloud |
| Category | Auth | Auth |
Score breakdown
| Criterion | Supabase Auth | Firebase Authentication |
|---|---|---|
| Fit for the use case /25 | 22 | 19 |
| Vibe-coder friendliness /15 | 14 | 12 |
| Output quality & reliability /15 | 12 | 13 |
| Pricing & free tier /15 | 13 | 13 |
| Ecosystem & integrations /10 | 9 | 9 |
| Momentum /10 | 7 | 5 |
| Code ownership & lock-in /10 | 8 | 3 |
Based on desk research of official pricing pages and docs; see methodology.
Who wins: Supabase Auth or Firebase Authentication?
By score, Supabase Auth wins Supabase Auth vs Firebase Authentication at 85/100 vs 74/100. Supabase Auth: The most generous managed free tier in auth (50K MAU) and the default for Lovable/Bolt-style apps, with users living in your own Postgres. Fewer drop-in UI components than Clerk, and best when you're already on Supabase. Firebase Authentication: Battle-tested, free for most small apps and excellent on mobile. Lock-in to Google, tight Spark-plan email quotas and less momentum among web vibe coders than Supabase Auth or Clerk. Supabase Auth is best for Apps already on Supabase, or vibe-coded apps from Lovable and Bolt that need sign-in tied to row-level security. Firebase Authentication is best for Mobile and Flutter apps, or projects already on Firebase and Google Cloud.
FAQ
- Which is better, Supabase Auth or Firebase Authentication?
- By our score, Supabase Auth (85/100) ranks above Firebase Authentication (74/100). Supabase Auth is best for Apps already on Supabase, or vibe-coded apps from Lovable and Bolt that need sign-in tied to row-level security. The right pick still depends on your workflow; see the side-by-side table.
- What is the Supabase Auth vs Firebase Authentication score?
- Supabase Auth scores 85/100 and Firebase Authentication scores 74/100 on PromptToProd's evidence-based ranking. Scores are never for sale.