Clerk vs Firebase Auth / Identity Platform
Answer: As of 2026-10-31: Clerk and Firebase Auth / Identity Platform tie at $0 for 1k users · no SSO; Firebase Auth / Identity Platform wins 10k users · 1 SSO at $2.25/mo ($273/yr less than Clerk) [Firebase Auth / Identity Platform SSO assumes 200 SSO users per connection; at 2,000 per connection: Clerk $25/mo, Firebase Auth / Identity Platform $29.25/mo, so Clerk becomes cheaper]; Firebase Auth / Identity Platform wins 50k users · 5 SSO at $14.25/mo ($3,729/yr less than Clerk) [Firebase Auth / Identity Platform SSO assumes 200 SSO users per connection; at 2,000 per connection: Clerk $325/mo, Firebase Auth / Identity Platform $149.25/mo]; Firebase Auth / Identity Platform wins 100k users · 10 SSO at $304.25/mo ($16,749/yr less than Clerk) [Firebase Auth / Identity Platform SSO assumes 200 SSO users per connection; at 2,000 per connection: Clerk $1,700/mo, Firebase Auth / Identity Platform $574.25/mo].
Cost by MAU (no SSO)
| Monthly users | Clerk | Firebase Auth / Identity Platform |
|---|---|---|
| 10k users | $0 Hobby | $0 Pay as you go |
| 50k users | $0 Hobby | $0 Pay as you go |
| 100k users | $1,025 Pro | $275 Pay as you go |
With enterprise SSO
| Scenario | Clerk | Firebase Auth / Identity Platform |
|---|---|---|
| 1k users · no SSO | $0 Hobby | $0 Pay as you go |
| 10k users · 1 SSO | $25 Pro | $2.25 Pay as you go |
| 50k users · 5 SSO | $325 Pro | $14.25 Pay as you go |
| 100k users · 10 SSO | $1,700 Pro | $304.25 Pay as you go |
Cheapest verified plan per vendor, monthly USD list price. SSO users: Amazon Cognito, Supabase Auth and Firebase Auth / Identity Platform bill SAML/OIDC per SSO user, not per connection (first 50 free, then $0.015 per SSO user a month). Their SSO results here assume 200 SSO users per connection (5 connections = 1,000 SSO users). See how 1,000 or 2,000 per connection changes the result or set your own. How we calculate this.
Clerk
Hobby free to 50k MRU/app. Pro $25/mo ($20 annual) with 50k MRU + 1 SSO + 1 Directory Sync. Extra SSO $75 (2–15) then $60 (16–100) and $48 (101–250). Directory Sync billed from 2027-01-01.
Source: clerk.com/pricing · 2026-10-31
Firebase Auth / Identity Platform
No cost up to 50k MAU (email, phone, anonymous, social), then $0.0055/MAU to 100k, $0.0046 to 1M, $0.0032 to 10M, $0.0025 above. SAML/OIDC: 50 MAU free then $0.015/MAU. SMS (phone sign-in and MFA) billed per message by region (US $0.01); first 10 SMS a day not billed. Sources: cloud.google.com/identity-platform/pricing and firebase.google.com/pricing.
Source: cloud.google.com/identity-platform/pricing · 2026-10-31
Also see: Clerk alternatives · Firebase Auth / Identity Platform alternatives · all vendors by MAU · vs self-hosting (Better Auth / Auth.js)
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