Auth0 vs Firebase
Auth0 and Firebase are both developer tools tools. Auth0 is aimed at developers and enterprise, while Firebase is aimed at developers. Both have a free plan.
| Pricing | Freemium · $35 | Freemium |
| Starting price | $35/mo | Not published |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers, Enterprise | Developers |
| Platforms | web | web, ios, android |
| Country | US · 2013 | US · 2011 |
| Rating | — | — |
Choose Auth0 if
Companies with enterprise SSO requirements or large consumer user bases.
- Generous free tier (25k MAU)
- Enterprise SSO and compliance depth
- Reliable at huge scale
Look elsewhere if: Early-stage React apps wanting prebuilt UI (Clerk) or teams wanting self-hosted ownership (Better Auth, Keycloak).
Choose Firebase if
Mobile and Flutter developers and teams in the Google ecosystem.
- Best-in-class mobile tooling and real-time sync
- Free tier suits prototypes and small apps
- Deep Google Cloud integration
Look elsewhere if: Relational data needs or teams wary of lock-in (Supabase, Neon).
Auth0 vs Firebase pricing
Auth0
- Free$0Up to 25,000 MAU, 1 custom domain, community support
- Essentials$35/moB2C, 500 MAU base; B2B from $150/mo; yearly = 11x monthly
- Professional$240/moB2C, 500 MAU base; B2B from $800/mo; 12 tenants
- EnterpriseCustom99.99% SLA, 30-day log retention
Firebase
- Spark$0No-cost usage limits, no payment method needed
- BlazePay as you goUsage-based beyond free quotas; $300 free credit if eligible
Auth0 · Key features
- Universal Login with social, enterprise and passwordless
- MFA, passkeys and adaptive attack protection
- Organizations for B2B multi-tenant SSO
- Fine-grained authorization and RBAC
- Actions for custom flows and integrations
- SDKs for web, mobile and backend
Cons
- Expensive once beyond free or with enterprise connections
- Complex configuration
- UI customization takes effort
Firebase · Key features
- Firestore and Realtime Database with offline sync
- Authentication with many providers and phone auth
- Cloud Functions, Hosting and Cloud Storage
- Cloud Messaging push, Remote Config and A/B testing
- Crashlytics, Performance Monitoring and Analytics
- Extensions marketplace and Genkit AI framework
Cons
- NoSQL data modeling pitfalls
- Costs can spike with read/write volume
- Heavy vendor lock-in
Auth0 vs Firebase: FAQ
Do Auth0 and Firebase have a free plan?
Yes, both Auth0 and Firebase have a free plan; paid plans add more usage and features.