Auth & Backend · side by side
Clerk vs Firebase Auth
Compare Clerk, Firebase Auth by active-user allowances, social login, MFA, SSO, organizations and audit logs.
Auth & Backend pricing calculator
25K
Clerk
$325 / mo
Pro · 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 | Clerk | Firebase Auth |
|---|---|---|
| Provider | Clerk | |
| Billing unit | MAUs | MAUs |
| Plan at selected usage | Pro | Spark |
| Monthly estimate | $325/mo | $0/mo |
| Workload | 25K MAUs | 25K MAUs |
| Free access | 10,000 MAUs | 50,000 MAUs |
| Published plans | Free, Pro, Enterprise | Spark, Blaze |
| Prices checked | Not listed | Not listed |
Provider
- Clerk
- Clerk
- Firebase Auth
Billing unit
- Clerk
- MAUs
- Firebase Auth
- MAUs
Plan at selected usage
- Clerk
- Pro
- Firebase Auth
- Spark
Monthly estimate
- Clerk
- $325/mo
- Firebase Auth
- $0/mo
Workload
- Clerk
- 25K MAUs
- Firebase Auth
- 25K MAUs
Free access
- Clerk
- 10,000 MAUs
- Firebase Auth
- 50,000 MAUs
Published plans
- Clerk
- Free, Pro, Enterprise
- Firebase Auth
- Spark, Blaze
Prices checked
- Clerk
- Not listed
- Firebase Auth
- Not listed
Auth & Backend monthly cost
Clerk: $325Firebase Auth: $0
Cost by MAUs
Cost curve data
| MAUs | Clerk | Firebase Auth |
|---|---|---|
| 0 | $0 | $0 |
| 6,250 | $0 | $0 |
| 12.5K | $75 | $0 |
| 25K | $325 | $0 |
| 50K | $825 | $0 |
| 125K | $2,325 | $413 |
| 250K | $4,825 | $1,100 |
0
- Clerk
- $0
- Firebase Auth
- $0
6,250
- Clerk
- $0
- Firebase Auth
- $0
12.5K
- Clerk
- $75
- Firebase Auth
- $0
25K
- Clerk
- $325
- Firebase Auth
- $0
50K
- Clerk
- $825
- Firebase Auth
- $0
125K
- Clerk
- $2,325
- Firebase Auth
- $413
250K
- Clerk
- $4,825
- Firebase Auth
- $1,100
Auth & Backend feature comparison
| Auth & Backend | Clerk | Firebase Auth |
|---|---|---|
| Monthly active users | 10K incl., then $0.02 | 50,000 MAUs |
| Social login | Unlimited social | Google, Apple, GitHub… |
| MFA / passkeys | MFA + passkeys | SMS MFA (Blaze) |
| Enterprise SSO (SAML) | $75/mo add-on | |
| Organizations / B2B | Orgs add-on | Multi-tenancy (Blaze) |
| Branding & custom domain | Remove branding | Basic |
| Audit logs | Full | Cloud Logging |
| Support | Community |
Monthly active users
- Clerk
- 10K incl., then $0.02
- Firebase Auth
- 50,000 MAUs
Social login
- Clerk
- Unlimited social
- Firebase Auth
- Google, Apple, GitHub…
MFA / passkeys
- Clerk
- MFA + passkeys
- Firebase Auth
- SMS MFA (Blaze)
Enterprise SSO (SAML)
- Clerk
- $75/mo add-on
- Firebase Auth
Organizations / B2B
- Clerk
- Orgs add-on
- Firebase Auth
- Multi-tenancy (Blaze)
Branding & custom domain
- Clerk
- Remove branding
- Firebase Auth
- Basic
Audit logs
- Clerk
- Full
- Firebase Auth
- Cloud Logging
Support
- Clerk
- Firebase Auth
- Community
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.
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