Clerk vs Supabase Auth: which should builders use?
Both handle sign-up, sign-in and sessions for web and mobile apps. Clerk is a dedicated auth product with prebuilt UI components and Organizations for B2B. Supabase Auth is part of the open-source Supabase stack (Postgres, Storage, Edge Functions) and ties into Row Level Security. Lovable and Bolt integrate Supabase natively; Clerk documents first-party setup for Lovable and agent skills for Cursor.
 Clerk |  Supabase | |
|---|---|---|
| Made by | Clerk | Supabase |
| What it is | Hosted auth and user management (drop-in UI, Organizations, Billing add-ons) | Auth as part of an open-source backend (Postgres, Storage, Edge Functions, Realtime) |
| Free tier | Hobby: 50,000 Monthly Retained Users (MRU) per app; up to 3 dashboard seats; up to 3 social connections; no MFA on Hobby | Free: 50,000 Monthly Active Users (MAU); 2 active projects; projects pause after 1 week idle |
| Paid entry | Pro $25/mo ($20/mo billed annually); Business $300/mo ($250/mo annual); Enterprise custom | Pro from $25/mo (100K MAU included); Team from $599/mo; Enterprise custom |
| How users are billed | Monthly Retained Users (MRU): a user counts only if they return at least one day after signing up (First Day Free). Overage on Pro from $0.02/MRU/mo | Monthly Active Users (MAU). Pro/Team: 100K included, then $0.00325 per MAU |
| Social / OAuth | Hobby: up to 3 social connections; Pro+: unlimited. Email codes, email links, passwords, usernames, Web3 wallets; SMS on Pro+ | Many social providers included (Google, GitHub, Apple, Discord, and more) plus custom OAuth/OIDC; phone via Twilio, MessageBird, Vonage |
| MFA | Pro and above: authenticator apps, SMS codes, and backup codes. Not on Hobby | Basic MFA (TOTP app authenticator) included on Free+. Advanced MFA (Phone) is a paid add-on ($75/mo first project, then $10/mo per extra project) |
| Organizations / B2B | Organizations on every plan (100 Monthly Retained Organizations/app, up to 20 members). Enhanced B2B Auth add-on $100/mo ($85 annual): unlimited members, custom roles, verified domains | No first-party Organizations product like Clerk's. Auth users live in Postgres; you model teams yourself and enforce access with RLS. Dashboard SSO is on Team+ |
| Prebuilt UI | Yes: SignIn, SignUp, UserButton, OrganizationSwitcher and related components across Clerk SDKs | Client SDKs and Auth APIs; you build the UI (or use community UI). Next.js with-supabase template includes auth routes |
| Framework support | First-party: Next.js, React, Expo, Astro, Nuxt, Vue, React Router, TanStack Start, JS, iOS, Android, plus backend SDKs | supabase-js and @supabase/ssr for Next.js, SvelteKit and other SSR frameworks; Flutter, Swift and more |
| Open source / self-host | Hosted SaaS; not offered as a self-hosted product | Yes: open source; self-host with Docker or the Supabase CLI |
| Database / RLS tie-in | No built-in database. Official third-party auth path lets Clerk JWTs drive Supabase RLS (or use Clerk with your own DB) | Auth JWTs integrate with Postgres Row Level Security via auth.uid() and auth.jwt(); RLS is the primary authorization model |
| AI app builders | Clerk documents a Lovable setup and ships Agent Skills, CLI and MCP for Cursor and other coding agents. First-party Next.js SDK (v0 defaults to Next.js) | Native in Lovable (all plans) and in Bolt on Pro/Teams. Supabase also ships Agent Skills and an MCP server for coding agents |
| Pricing (approx.) | Hobby free (50K MRU/app); Pro from $25/mo ($20/mo annual) | Free tier (2 projects; pause after 1 week idle); Pro from $25/mo |
| Our rankings | not in a ranking yet | #2 in Deploy & ship |
How the pricing units differ
Clerk bills Monthly Retained Users, not MAU. A signup who never returns after the first day does not count toward MRU, and Hobby includes 50K MRU per app. Past 50K on Pro, overage starts at $0.02 per MRU per month with volume discounts. Supabase Auth bills MAU: Free includes 50K, Pro and Team include 100K, then $0.00325 per MAU. Supabase Free also pauses projects after a week of inactivity and caps you at two active projects; Clerk Hobby does not pause apps.
Auth-only vs full backend
Pick Clerk when you want polished prebuilt sign-in UI, Organizations for B2B multi-tenancy, and auth that is separate from your database. Pick Supabase Auth when you want auth, Postgres, Storage and Edge Functions in one stack with Row Level Security enforcing who can read each row. You can also combine them: Supabase documents Clerk as a third-party auth provider so Clerk session tokens can drive Supabase RLS.
Pick Clerk if…
You want drop-in sign-in UI, Organizations for a multi-tenant SaaS, MFA/passkeys on a paid plan, or you're wiring auth into a Next.js / React app with Cursor (Clerk Skills) or Lovable using Clerk's documented guide.
Pick Supabase if…
You're shipping with Lovable or Bolt (native Supabase), you want SQL + RLS authorization in one place, you may self-host later, or you want auth included with Free/Pro Postgres instead of a separate auth vendor.
Our verdict
For AI-built apps in 2026, default to Supabase Auth when the app already uses Supabase (especially on Lovable or Bolt) so RLS stays the source of truth. Pick Clerk when auth UX and B2B Organizations matter more than bundling with the database — or use both, with Clerk as the identity provider and Supabase RLS reading Clerk JWTs.
Facts and prices checked on vendor pages on Oct 15, 2026: Clerk pricing, Clerk docs, Clerk Next.js quickstart, Clerk UI components, Clerk + AI / Skills, Clerk + Lovable guide, Supabase pricing, Supabase Auth, Supabase Auth MFA, Supabase Row Level Security, Supabase + Clerk third-party auth, Supabase Next.js quickstart, Lovable + Supabase, Bolt + Supabase. Plans and limits change often, so confirm before you buy.