Auth & Backend · side by side
Auth0 vs Firebase Auth
Compare Auth0, Firebase Auth by active-user allowances, social login, MFA, SSO, organizations and audit logs.
Auth & Backend pricing calculator
25K
Auth0
$0 / mo
Free · 25K MAUs
Firebase Auth
$0 / mo
Spark · 25K MAUs
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Auth & Backend overview & pricing
| Auth & Backend | Auth0 | Firebase Auth |
|---|---|---|
| Provider | Okta | |
| Billing unit | MAUs | MAUs |
| Plan at selected usage | Free | Spark |
| Monthly estimate | $0/mo | $0/mo |
| Workload | 25K MAUs | 25K MAUs |
| Free access | 25,000 MAUs | 50,000 MAUs |
| Published plans | Free, B2C Essentials, B2C Professional, Enterprise | Spark, Blaze |
| Prices checked | 2026-09-25 | 2026-09-25 |
Provider
- Auth0
- Okta
- Firebase Auth
Billing unit
- Auth0
- MAUs
- Firebase Auth
- MAUs
Plan at selected usage
- Auth0
- Free
- Firebase Auth
- Spark
Monthly estimate
- Auth0
- $0/mo
- Firebase Auth
- $0/mo
Workload
- Auth0
- 25K MAUs
- Firebase Auth
- 25K MAUs
Free access
- Auth0
- 25,000 MAUs
- Firebase Auth
- 50,000 MAUs
Published plans
- Auth0
- Free, B2C Essentials, B2C Professional, Enterprise
- Firebase Auth
- Spark, Blaze
Prices checked
- Auth0
- 2026-09-25
- Firebase Auth
- 2026-09-25
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Auth & Backend monthly cost
Auth0: $0Firebase Auth: $0
Cost by MAUs
Cost curve data
| MAUs | Auth0 | Firebase Auth |
|---|---|---|
| 0 | $0 | $0 |
| 6,250 | $0 | $0 |
| 12.5K | $0 | $0 |
| 25K | $0 | $0 |
| 50K | $3,500 | $0 |
| 125K | $8,750 | $413 |
| 250K | $17,500 | $1,100 |
0
- Auth0
- $0
- Firebase Auth
- $0
6,250
- Auth0
- $0
- Firebase Auth
- $0
12.5K
- Auth0
- $0
- Firebase Auth
- $0
25K
- Auth0
- $0
- Firebase Auth
- $0
50K
- Auth0
- $3,500
- Firebase Auth
- $0
125K
- Auth0
- $8,750
- Firebase Auth
- $413
250K
- Auth0
- $17,500
- Firebase Auth
- $1,100
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Auth & Backend feature comparison
| Auth & Backend | Auth0 | Firebase Auth |
|---|---|---|
| Monthly active users | 25,000 MAUs | 50,000 MAUs |
| Social login | Unlimited social | Google, Apple, GitHub… |
| MFA / passkeys | Basic | SMS MFA (Blaze) |
| Enterprise SSO (SAML) | ||
| Organizations / B2B | Up to 5 orgs | Multi-tenancy (Blaze) |
| Branding & custom domain | Custom domain | Basic |
| Audit logs | 1-day logs | Cloud Logging |
| Support | Community | Community |
Monthly active users
- Auth0
- 25,000 MAUs
- Firebase Auth
- 50,000 MAUs
Social login
- Auth0
- Unlimited social
- Firebase Auth
- Google, Apple, GitHub…
MFA / passkeys
- Auth0
- Basic
- Firebase Auth
- SMS MFA (Blaze)
Enterprise SSO (SAML)
- Auth0
- Firebase Auth
Organizations / B2B
- Auth0
- Up to 5 orgs
- Firebase Auth
- Multi-tenancy (Blaze)
Branding & custom domain
- Auth0
- Custom domain
- Firebase Auth
- Basic
Audit logs
- Auth0
- 1-day logs
- Firebase Auth
- Cloud Logging
Support
- Auth0
- Community
- Firebase Auth
- Community
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Which authentication & backend providers fit your needs?
How to compare authentication & backend providers
Check how each provider defines an active user and separates consumer identity from enterprise organizations. SAML, MFA, custom domains and audit logs can be gated behind higher plans. A backend platform can also charge separately for storage, functions and traffic.
Browse Auth & Backend pricing