Firebase Authentication
Simple, multi-platform sign-in
- Also known as
- firebase-authentication
What is Firebase Authentication?
Provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users to your app. Supports email and password accounts, phone auth, Google, Apple, X, Facebook, and GitHub login.
Firebase Authentication pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
Free tier with 50K MAUs, then usage-based pricing. Phone auth billed per SMS.
Spark
FreeNo-cost plan with usage limits
- saml_oidc_maus
- 50
- identity_platform_maus
- 50K
- Email and password authentication
- Phone authentication
- Social login (Google, Apple, X, Facebook, GitHub)
- FirebaseUI
- No payment method required
Blaze
Pay as you go plan
- All Spark features
- Higher usage limits
- Phone auth billed per SMS
- Identity Platform SAML/OIDC available
What Firebase Authentication does
The capabilities that matter for auth & identity software, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Hosting
- Cloud only
- Social login
- ✓
- Passwordless
- ✓
- Passkeys / WebAuthn
- -
- Multi-factor auth
- -
- SAML SSO
- ✓
- SCIM provisioning
- -
- B2B / multi-tenancy
- -
- OpenID Connect provider
- ✓
- Hosted UI
- Both
- RBAC
- -
- Self-hostable OSS core
- ✗
Platform & deployment
Independently observed- iOS
- Web
- Android
- Cloud / SaaS
Firebase Authentication alternatives
Other auth & identity software we track, ranked by the same independent score.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Firebase Authentication, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Reliability | 50 | 18.00 | 900.0 | ✓ |
| Capabilities | 67 | 12.00 | 805.4 | ✓ |
| Pricing Transparency | 80 | 10.00 | 800.0 | ✓ |
| Price Level | 80 | 8.00 | 640.0 | ✓ |
| Integrations | 0 | 12.00 | 0.0 | - |
| Security Posture | 0 | 40.00 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.