At 100K monthly active users, Clerk costs $1,825/month and Supabase Auth costs $25/month. Same authentication. 73x price difference. Find your number before you scale.
Enter your MAU · Select feature tier · Compare all providers instantly
Same authentication. Wildly different pricing at scale.
Clerk and Supabase Auth both let users sign in with email, Google, and GitHub. Both handle sessions, JWTs, and user management. At 1,000 users they cost the same: $0. At 100,000 users, Clerk charges $1,825/month ($0.02/MAU after 10K free). Supabase charges $25/month ($0.00325/MAU after 50K free).
| Provider | Free MAU | Rate after free | 10K MAU | 50K MAU | 100K MAU |
|---|---|---|---|---|---|
| Supabase AuthCHEAPEST | 50,000 | $0.00325 | $0 | $0 | $25 |
| WorkOS | 1,000,000 | $0.001 | $0 | $0 | $0 |
| Firebase Auth | 50,000 | $0.0055 | $0 | $0 | $275 |
| Clerk | 10,000 | $0.02 | $0 | $800 | $1,825 |
| Auth0 (Okta) | 7,500 | $0.07 | $175 | $2,975 | $5,000+ |
The cheapest option is not always the right option.
Best if you are already using Supabase for your database. Auth is essentially included. No pre-built UI — you build login forms yourself with their SDK.
Best developer experience. Pre-built React/Next.js components, organizations, multi-session. Worth the cost below 10K MAU (free). Gets expensive fast after that.
Best for enterprise B2B. 1M MAU free, then $0.001/MAU. Built for SSO-first products. Overkill for B2C apps.
Auth0's per-MAU pricing becomes extremely expensive at scale. The 7,500 free MAU limit is the lowest of all providers compared here.
Start building with auth included:
Clerk is free up to 10,000 MAU. After that, it costs $0.02 per MAU. At 100,000 users that is $1,825/month — significantly more than alternatives like Supabase Auth ($25/month).
Supabase Auth is the cheapest at scale: 50,000 free MAUs then $0.00325/MAU. At 100K users it costs ~$25/month. If you are already using Supabase for your database, auth is essentially free.
Clerk wins for developer experience and Next.js/React apps. Auth0 wins for enterprise compliance, SAML SSO, and complex B2B requirements. For most indie developers and startups, Clerk or Supabase Auth is the better choice.
Yes. Select Enterprise feature tier in the calculator to include SSO/SAML pricing. Auth0 and WorkOS are optimized for enterprise SSO; Clerk charges extra for SSO connections.