Clerk vs Supabase Auth in 2026: Real Pricing at Scale

Clerk and Supabase Auth get compared constantly because they solve the same problem - who signs in, how sessions work, how you gate access to data - for two very different reasons to exist. Clerk is a dedicated authentication vendor: you install an SDK, drop in prebuilt UI components, and your user data lives in Clerk's infrastructure. Supabase Auth is one feature of a full backend platform: your users end up as rows in your own Postgres database, and access control is written as SQL policies that run at the database layer. That architectural split matters more than any feature checklist, and it is also what drives the pricing gap we calculate below.

Same $25 sticker price, two different products

Both companies publish the same headline number today: $25/month for the first paid tier. Clerk's official pricing page, fetched live on 2026-07-12, lists Pro at $25/mo billed monthly or $20/mo billed annually, with Business at $300/mo monthly ($250/mo annually) and a fully custom Enterprise tier that is annual-billing only. Supabase's pricing page, also fetched the same day, lists Pro starting from $25/month, Team starting from $599/month, and Enterprise as custom.

What differs immediately is what that $25 buys. Clerk's free Hobby plan and its Pro plan share a 50,000-user-per-app ceiling for what Clerk calls Monthly Retained Users, or MRU - a user only counts once they return to your app at least 24 hours after signing up, which is a stricter (and usually smaller) number than a raw signup count. Supabase's Pro plan raises its included user count to 100,000 monthly active users - double Clerk's ceiling - before any per-user overage starts. That single difference in where the free ceiling sits is the entire story for any app that expects to grow past 50,000 users.

The overage math nobody puts in a pricing table

Sticker prices only describe the floor. The real comparison is what happens once an app grows past the free ceiling, and the two vendors' overage tables point in opposite directions.

Clerk's overage ladder, taken directly from its pricing page (live-fetched 2026-07-12), charges per MRU above the shared 50,000 limit:

• 50,001 to 100,000 MRU: $0.02/mo each
• 100,001 to 1,000,000 MRU: $0.018/mo each
• 1,000,001 to 10,000,000 MRU: $0.015/mo each
• 10,000,001+: $0.012/mo each

Supabase's overage is a single flat rate once you clear its higher, 100,000-user included tier: $0.00325 per MAU beyond that threshold.

Running both tables against two real growth scenarios:

At 60,000 users (10,000 over Clerk's ceiling, still under Supabase's): Clerk Pro costs $25 base plus 10,000 x $0.02 = $200 in overage, for $225/month. Supabase Pro costs just the $25 base, because 60,000 users has not yet crossed its 100,000-user included tier - $25/month.

At 150,000 users: Clerk's overage crosses two rate tiers - the first 50,000 excess users (50,001-100,000) at $0.02 each is $1,000, and the next 50,000 (100,001-150,000) at $0.018 each is $900, for $1,900 in overage on top of the $25 base, landing at $1,925/month. Supabase's overage is 50,000 users beyond its 100,000-user ceiling at $0.00325 each, which is $162.50 on top of the $25 base, for $187.50/month.

That is more than a 10x gap at 150,000 users, and it is not a rounding artifact - it comes directly from Clerk pricing MRU overage roughly six times higher per user than Supabase prices MAU overage, combined with Clerk's free ceiling sitting at half of Supabase's. If your app has a credible path to six figures of monthly users, run these exact tables against your own growth forecast before committing to either vendor's free tier as a long-term home.

What the base $25 plan includes beyond user counts

Clerk Pro removes Clerk's branding from auth screens, adds multi-factor authentication and custom session lifetimes, extends log retention to 7 days, and includes one Enterprise Connection (EASIE/SAML/OIDC) with additional connections at $75/mo each for enterprise SSO. Transactional SMS is billed separately at $0.01/SMS for US and Canada numbers, with international texts priced at market rate. Business adds 10 dashboard seats (with $20/mo per additional seat), a SOC2 report, priority support, and 30-day log retention. Enterprise adds a 99.99% uptime SLA, HIPAA coverage with a signed BAA, and a dedicated support Slack channel, but only on annual billing.

Supabase Pro's $25 covers far more than auth: an 8 GB Postgres disk (then $0.125 per GB), 250 GB of egress bandwidth (then $0.09 per GB), 100 GB of file storage (then $0.0213 per GB), 2 million Edge Function invocations (then $2 per additional million), and 500 concurrent Realtime connections (then $10 per additional 1,000). Crucially, Pro and Team plans include $10/month in compute credits that cover one Micro instance - that credit is baked into the $25 you are already paying, so a workload that needs more than a Micro-class database instance adds compute cost on top, independent of how many users your auth system has.

Feature checklist: sign-in flows, MFA, and enterprise SSO cost models

Both products cover the authentication basics you would expect: email/password, magic links, social login, and multi-factor authentication. The gap opens in delivery and enterprise pricing model.

Clerk ships a full component library - prebuilt SignIn, SignUp, UserButton, and UserProfile React components, plus a Waitlist component for gated launches - so a team can have a production-looking auth flow running in an afternoon without writing custom screens. Clerk markets this directly as being "more than authentication," positioning itself as full-stack user management rather than a backend-only service. Native SDKs cover Next.js, React, Expo, React Router, TanStack React Start, and Astro, and the product explicitly lists integrations with Supabase, Convex, and Vercel - Clerk can sit in front of a Supabase database rather than only competing with Supabase's own Auth product (more on that combination below).

Supabase Auth supports "20+ providers out of the box (Google, GitHub, Apple, Azure/Microsoft, Facebook, Twitter, Discord, GitLab, and more)" and "SAML 2.0 support for enterprise single sign-on," but it does not ship an equivalent first-party component library - you build your own sign-in screens against its API, or reach for a community UI kit. What you get in exchange is that Supabase Auth is "deeply integrated with Postgres Row Level Security for fine-grained access control," with authorization policies "evaluated at the database level, no middleware needed" - your auth.users table lives in the same Postgres project as the rest of your data, across "16+ global regions," rather than in a separate vendor's infrastructure. If your team already compares Postgres-native auth against Auth0 and NextAuth, this database-level RLS integration is Supabase Auth's clearest structural advantage over every component-driven competitor, Clerk included.

The two vendors also price enterprise SSO on opposite models. Clerk charges per SAML/OIDC connection: one included free on Pro, then a declining per-connection scale - $75/month each for connections 2-15, $60/month for 16-100, $30/month for 101-500, and $15/month for 500+ - regardless of how many employees actually log in through any given connection. Supabase charges per SSO'd user: $0.015 per MAU once you exceed 50 included SSO users on a paid plan. A single enterprise customer with a few hundred daily-active SSO users can end up cheaper on Clerk's flat per-connection fee; a handful of small SSO customers with low headcount each can end up cheaper on Supabase's per-user model. Model your actual customer roster instead of assuming either pricing shape wins by default.

Organizations and B2B multi-tenancy

Clerk sells multi-tenancy as a dedicated add-on with its own UI: CreateOrganization, OrganizationSwitcher, OrganizationProfile, and OrganizationList components, plus custom roles, invitation flows, and auto-join rules for onboarding and managing multi-tenant SaaS organizations. The Hobby and default paid plans include 100 MROs (monthly retained organizations) per app; going wider requires the B2B add-on at $100/mo ($85/mo billed annually) for unlimited org members, with additional MRO volume pricing starting at $1 per organization beyond the included 100.

Supabase Auth has no comparable packaged product. Multi-tenancy is something you design yourself: a workspace or organization table, membership rows, and Row Level Security policies that key off the authenticated user's JWT claims. That is more implementation work up front, but it also means there is no separate per-organization bill to track - your multi-tenant logic lives in the same schema and the same pricing model as the rest of your database usage.

When Clerk is the right call

Pick Clerk when the team wants a production-ready auth surface without building screens: startups racing to a demo or an MVP, teams that need B2B organization management out of the box, or codebases that are not on Supabase's database at all (Clerk works fine as a standalone auth layer in front of any backend, including a plain Postgres instance, Convex, or Firebase). It is also the easier sell to a design team, since the component library already matches modern UI conventions without custom CSS work.

When Supabase Auth is the right call

Pick Supabase Auth when the app is already built on Supabase Postgres, or when the database-level Row Level Security model is the security posture you want: authorization rules live in SQL next to the schema they protect, not in a separate vendor's dashboard. It is also the stronger pick on pure unit economics for any app with a credible growth story past 100,000 users, given the roughly 6x gap between Clerk's MRU overage rate and Supabase's MAU overage rate demonstrated above. Teams already evaluating Supabase against Firebase for the database layer get Auth "for free" as part of that same platform decision, rather than adding a third vendor relationship on top of a two-vendor stack.

The hybrid path: Clerk on top of a Supabase database

These two products are not strictly either/or. Clerk's own site lists Supabase as a supported integration, and the common pattern is running Clerk for sign-in, session management, and organization UI, while forwarding a signed JWT into Supabase so Postgres Row Level Security policies can still authorize access to that same data. This costs more than either product alone - you are paying Clerk's per-user pricing on top of Supabase's database pricing - but it lets a team keep Clerk's component library and organization management while still getting RLS-enforced data access. It is worth pricing out explicitly if the deciding factor is "we want Clerk's UI but we also want Supabase's database," rather than treating this as a strict two-way comparison.

Migration risk and lock-in

Moving away from either vendor later carries different costs. Clerk stores user identities and credentials in its own infrastructure, so migrating off Clerk means exporting user records and re-implementing password/session handling against a new provider - a nontrivial data migration even with Clerk's export tooling. Supabase Auth's users already live in your own Postgres database (the auth schema in your project), so in principle the data never has to leave your infrastructure; the migration risk is smaller for the user records themselves, but larger for any Row Level Security policies and Postgres-specific logic you have built around them, which do not port cleanly to a non-Postgres backend. Neither risk is small enough to ignore before committing a production app to either vendor's free tier.

The verdict

Neither answer is wrong for every team. If the fastest path to a working, good-looking sign-in flow matters more than long-run per-user economics, Clerk earns its price. If the app's growth plan realistically crosses six figures of monthly users, or if keeping every table - including auth.users - in one Postgres project is a security requirement, Supabase Auth's overage math and database-level RLS integration make the stronger case.

Keep reading

• Best authentication services for 2026 — the wider shortlist across Clerk, Supabase Auth, Auth0, and every other option we track.
• Clerk on ToolPick — the full feature and alternatives breakdown for Clerk specifically.
• Supabase on ToolPick — the same treatment for Supabase, covering the database and platform beyond just Auth.