At a glance
Clerk, Auth0 and Supabase Auth are the three authentication providers most teams choose between in 2026 to handle sign-up, login, sessions and access control without building auth from scratch, which is the part of an app you really do not want to get wrong. They aim at different users: Clerk leads on developer experience with drop-in UI components and the smoothest setup; Auth0 (an Okta product) is the enterprise standard for SAML single sign-on, compliance and advanced security; and Supabase Auth comes bundled with a Supabase Postgres database and Row Level Security, with the most generous free tier and the lowest cost at scale. All three implement modern standards like OAuth and OpenID Connect under the hood. This page compares them honestly on developer experience, free tiers, cost at scale and openness so you can match the provider to your project. For the standard they are built on, see our What Is OAuth explainer, and if you are also choosing a database, see our Convex vs Supabase vs Firebase comparison. Pricing is as of 2026 and moves over time.
The options
Side by side
| Dimension | Clerk | Auth0 | Supabase Auth |
|---|---|---|---|
| Vendor | Clerk | Auth0 (Okta) | Supabase |
| License | Closed-source (managed) | Closed-source (managed) | Open-source (Apache-2.0) |
| Self-hosting | No | No (managed) | Yes, with Supabase |
| Developer experience | Best-in-class drop-in UI | Powerful but more configuration | Good, more build-your-own UI |
| Free tier (as of 2026) | About 10,000 MAU | Free MAU tier (smaller) | About 50,000 MAU |
| Cost at scale | Moderate (per MAU) | Highest (per MAU) | Lowest (per MAU) |
| Best for | Fast SaaS setup, great auth UI | Enterprise SSO and compliance | Supabase users, cheap at scale, self-hosting |
The verdict
Pick Clerk if you want the best developer experience and the fastest path to production: drop-in UI components, modern features like passkeys and a generous free tier make it the favourite for indie hackers and React or Next.js SaaS, accepting that it is managed and priced per MAU. Pick Auth0 if you are an enterprise or B2B SaaS that needs SAML single sign-on, advanced security policies and broad compliance; it is the most capable and most battle-tested, with the trade-off that per-MAU pricing gets expensive at scale. Pick Supabase Auth if you are already on Supabase or you want the cheapest auth at scale with the option to self-host; it pairs naturally with Postgres and Row Level Security and has the most generous free tier, at the cost of fewer polished UI components and lighter enterprise features. The honest rule of thumb: Clerk for developer experience, Auth0 for enterprise needs, Supabase Auth for cost and openness. All three are built on standards like OAuth and OpenID Connect, explained in our What Is OAuth guide.