Clerk vs Supabase Auth in 2026
Clerk vs Supabase Auth comes down to whether you already use Supabase. Supabase Auth stores users in your project's Postgres database and ties sign-in to row level security, and the free plan covers 50,000 monthly active users. Clerk is a separate auth and user management service with prebuilt UI components and organizations, and its free plan covers 50,000 monthly retained users per app.
Facts and prices checked on against the sources listed below.
Quick verdict
Clerk
Starts atPro $25/mo
Pick Clerk if you want polished sign-in and account screens without building them, organizations for B2B, and an auth service that works with any database.
Pick Supabase Auth if your data is in Supabase, you want row level security tied to the signed-in user, and you expect many users on a fixed price.
Clerk vs Supabase Auth at a glance
| Feature | Clerk |  Supabase Auth |
|---|---|---|
| What it is | Auth and user management with prebuilt UI, organizations and billing | Auth built into each Supabase project |
| Where users live | In Clerk's service | In your project's Postgres database, in its own schema |
| Free plan | 50,000 MRU per app | 50,000 MAU, as part of Supabase Free |
| Paid plan | Pro, $25 a month, 50,000 MRU included | Supabase Pro, from $25 a month, 100,000 MAU included |
| More users | $0.02 per MRU from 50,001 to 100,000 | $0.00325 per MAU |
| MFA | Pro and up | TOTP or phone |
| SSO | 1 SAML connection on Pro, then from $75 a month each | SAML 2.0 SSO, billed per SSO MAU |
| Data access rules | Your backend checks the Clerk session | Row level security policies read the Auth token |
Pricing and free tier (checked Oct 2026)
Supabase Auth is part of each Supabase project, so it shares the project's plan. The Free plan includes 50,000 monthly active users and Pro, from $25 a month, includes 100,000. Past that, each extra MAU costs $0.00325. Third party MAU, SSO MAU and advanced MFA are billed as separate items.
Clerk is priced on its own. Hobby is free with 50,000 monthly retained users per app. Pro costs $25 a month ($20 billed yearly) with the same 50,000 included, then $0.02 per user up to 100,000, $0.018 up to 1 million and less after that. Business costs $300 a month.
At small scale both are free. At large scale the gap is wide: 100,000 users cost about $1,025 a month on Clerk Pro and fit inside Supabase Pro's $25 base price, at the time of writing.
Where your users live
This is the deeper difference. Supabase Auth keeps user records in your project's Postgres database, in a dedicated schema, and you can link them to your own tables with triggers and foreign keys. Row level security policies can read the signed-in user's token, so the database itself enforces who sees which rows.
Clerk keeps users in its own service. Your app checks the Clerk session, and your backend decides what each user can access. That works with any database, not only Postgres.
Sign-in methods and security
Supabase Auth supports password, magic link, one-time passwords, social sign-in with about 20 named providers plus custom OAuth2 and OIDC providers, phone sign-in through MessageBird, Twilio or Vonage, SAML 2.0 SSO and MFA with TOTP or phone.
Clerk offers several authentication strategies, MFA from Pro, one SAML connection per app on Pro and more from $75 a month each, plus a Protect add-on for abuse checks (10,000 checks a month free).
UI and B2B
Clerk's prebuilt UI components give you sign-in, sign-up and account screens without building them, and organizations are free for 100 monthly retained orgs per app. With Supabase Auth, you build or pick your own UI and model teams in your own tables.
When to pick Clerk
- You want polished auth screens and user management out of the box.
- You need organizations and roles for a B2B app.
- Your data is not in Supabase.
When to pick Supabase Auth
- Your app already runs on Supabase.
- You want row level security tied to the signed-in user.
- You expect many users and want a fixed monthly price.
See also Clerk vs Auth0 and Supabase vs Firebase.
FAQ
Which is cheaper at 100,000 users?
Supabase Auth, by a wide margin. At the time of writing Supabase Pro costs from $25 a month and includes 100,000 MAU. On Clerk Pro, 100,000 retained users means $25 plus 50,000 users at $0.02, or about $1,025 a month.
Is Supabase Auth free?
Up to 50,000 monthly active users on the Supabase Free plan, which also includes the database, storage and functions. Free projects pause after 1 week of inactivity, so a live app usually moves to Pro.
Does Clerk work without Supabase?
Yes. Clerk is its own service with quickstarts for Next.js, React, Expo and Astro and backend SDKs, so you can pair it with any database or backend.
Which is better for B2B apps?
Clerk has more built in for B2B: organizations are free for 100 monthly retained orgs per app, and the Enhanced B2B add-on ($100 a month) adds custom roles, verified domains and unlimited members. Supabase Auth supports SAML 2.0 SSO, but team and role models are yours to build in Postgres.
Sources, checked October 30, 2026
Prices and plans change often. If something here is out of date, tell us through the contact page.