Head to head
Firebase Authentication vs Supabase Auth
As a authentication & identity API, Firebase Authentication rates higher on the APIbenchmarks Index, 87.6 to 82.2, a 5.4-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Firebase Authentication | Supabase Auth |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 87.6 | 82.2 |
Specifications
| Firebase Authentication | Supabase Auth | |
|---|---|---|
| Best for | Mobile/web auth inside Firebase | Postgres-native auth in an OSS BaaS |
| Free tier | 50k MAU (basic email/social) | 50k MAU (Free plan) |
| Pricing | MAU-based (+ per-SMS) | MAU-based (+ platform fee) |
| Official SDKs | 11 languages | 6 languages |
Is Firebase Authentication better than Supabase Auth?
On the APIbenchmarks Index, Firebase Authentication rates higher (87.6 vs 82.2). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.
Verdict in one line
Firebase Authentication leads by 5.4 points (87.6 vs 82.2) and wins 3 of 4 criteria; Supabase Auth wins 1.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 85 | 84 | |
| Reliability | 90 | 76 | |
| Ecosystem & SDKs | 88 | 80 | |
| Accessibility | 88 | 90 |
Choose Firebase Authentication if… / choose Supabase Auth if…
- →documentation & dx matters most to you (85 vs 84)
- →reliability matters most to you (90 vs 76)
- →ecosystem & sdks matters most to you (88 vs 80)
- →you need broad SDK coverage (11 official SDKs vs 6)
- →your use case matches its focus: mobile/web auth inside firebase
- →accessibility matters most to you (90 vs 88)
- →your use case matches its focus: postgres-native auth in an oss baas
Pricing side by side
- Model
- MAU-based (+ per-SMS)
- Free tier
- 50k MAU (basic email/social)
- No-cost tier (Spark / Blaze free allowance)$0
- Standard MAU (Blaze, 50,001–100,000)$0.0055 / MAU
- Standard MAU (100,001–1,000,000)$0.0046 / MAU
- Standard MAU (1,000,001–10,000,000)$0.0032 / MAU
- Enterprise SSO (SAML / OIDC)$0.015 / MAU
- Phone / SMS authentication~$0.01–$0.06 / SMS
- Model
- MAU-based (+ platform fee)
- Free tier
- 50k MAU (Free plan)
- Free$0/mo
- Pro$25/mo
- Team$599/mo
- EnterpriseCustom
Vendor-published pricing, verified 2026-06-27 (Firebase Authentication) and 2026-06-27 (Supabase Auth).
SDK and language coverage
Both · 0
None
Only Firebase Authentication · 11
iOS (Swift/Objective-C)Android (Kotlin/Java)Web (JavaScript)Flutter (Dart)UnityC++Admin SDK: Node.jsAdmin SDK: JavaAdmin SDK: PythonAdmin SDK: GoREST API
Only Supabase Auth · 6
JavaScript / TypeScriptFlutter / DartSwiftKotlinPythonC# (.NET)
Strengths and weaknesses
- +50,000 free monthly active users plus cheap graduated per-MAU pricing makes it very low cost for consumer apps
- +Extremely fast to integrate, working auth in a few lines of code, with an optional FirebaseUI drop-in widget
- +Broad first-party SDK coverage: iOS, Android, Web, Flutter, Unity, C++, and Admin SDKs for Node, Java, Python, Go
- –Limited customization of auth flows and hosted UI; the SMS template and FirebaseUI widget cannot be meaningfully changed
- –Significant vendor lock-in, historically no clean user-export API and the Firebase UID is hard to map back when migrating off
- –Enterprise features (SAML/OIDC, MFA, SLA, real support) require the paid Identity Platform tier
- +Deep Postgres Row-Level Security integration: JWT claims are usable directly inside SQL policies for DB-layer authorization
- +Very generous free tier (50,000 MAU) and low overage pricing ($0.00325/MAU) versus Auth0/Okta
- +Broad auth methods out of the box: password, magic link, OTP, phone, anonymous, dozens of social OAuth providers, plus TOTP/phone MFA
- –B2C-first: no first-class Organizations model and no SCIM provisioning for B2B tenancy
- –SAML/OIDC support is comparatively immature; SSO gated to Pro and above
- –No adaptive/risk-based MFA or bot-detection capabilities
Firebase Authentication vs Supabase Auth: questions
- Which has better documentation, Firebase Authentication or Supabase Auth?
- Firebase Authentication scores higher on documentation and developer experience: 85 vs 84 out of 100.
- Which is more reliable, Firebase Authentication or Supabase Auth?
- Firebase Authentication scores higher on reliability: 90 vs 76 out of 100.
- Do Firebase Authentication and Supabase Auth have a free tier?
- Firebase Authentication: yes (50k MAU (basic email/social)). Supabase Auth: yes (50k MAU (Free plan)).
- How are Firebase Authentication and Supabase Auth priced?
- Firebase Authentication: MAU-based (+ per-SMS). Supabase Auth: MAU-based (+ platform fee).
- Which has more official SDKs?
- Firebase Authentication lists 11 official SDKs, Supabase Auth lists 6.