Clerk vs Auth0

Clerk vs Auth0: the short answer

Pick Clerk if you want working, polished auth this afternoon for a SaaS or Next.js app. Pick Auth0 if your customers bring their own identity providers or you need fine control over the auth pipeline. Before you have enterprise customers, Auth0 is more platform than you need.

What is Clerk?

Clerk is a drop-in authentication product covering both the UI (sign-in, sign-up, user profile) and the backend user and organization management. Prebuilt components handle the screens, and SSO is available without writing enterprise flows.

What is Auth0?

Auth0, now part of Okta, is an identity platform built for harder problems: single sign-on, SAML and OIDC federation, and login across many customer organizations. Teams reach for it when "add login" turns into supporting enterprise customers' existing identity providers.

Clerk vs Auth0 pricing

Pricing checked November 2026.

Clerk (billed by monthly retained users, MRU):

• Hobby: free, 50,000 MRU per app, custom domain, up to 3 social connections. No SSO, MFA or passkeys.
• Pro: $20/month billed annually ($25 monthly). Adds MFA, passkeys and unlimited social connections. Users past 50,000 cost $0.02 each per month. One SSO connection included, extras are $75/month each.
• Business: $250/month billed annually ($300 monthly).
• Enterprise: custom.

Auth0 (billed by monthly active users, MAU):

• Free: $0, up to 25,000 MAU, 5 organizations, 1 enterprise connection.
• Essentials: from $35/month.
• Professional: from $240/month.
• Enterprise: custom.

For a solo builder, both are free to start, and Clerk's free tier covers more users once you count retained rather than active ones. The picture flips when you need MFA or SSO: Clerk Pro at $20/month is cheap, while Auth0's paid tiers start at $35 and $240. A user only counts toward Clerk's bill if they return at least 24 hours after signing up.

Key differences

• Setup speed: Clerk ships prebuilt components and Next.js-friendly middleware. Auth0 offers Universal Login, with more configuration to work through.
• Customization depth: Auth0's Actions and Forms let you shape the auth flow, such as custom claims and MFA logic. Clerk keeps you in a more standard flow.
• Enterprise identity: Auth0 goes deeper on SAML and OIDC federation and enterprise connections. Clerk supports SSO but is not as deep.
• Billing metric: Clerk counts retained users, which can come out lower for apps with many one-time sign-ups. Auth0 counts monthly active users.
• Organizations: Both support them. Clerk has B2B organizations free up to 100 monthly retained organizations per app, and Auth0 includes 5 on the free plan.
• AI agent features: Auth0 lists Auth for MCP and Token Vault. Clerk lists machine auth with API keys and M2M tokens.

When to pick Clerk

• You're building a SaaS and want auth working fast.
• You use Next.js and want matching middleware and components.
• You want MFA and passkeys on a low-cost plan.
• Your sign-ups include many users who never return.

When to pick Auth0

• You're selling to businesses that bring their own identity provider.
• You need custom logic in the login pipeline.
• You want a bigger free tier by raw user count (25,000 MAU).
• You need a private cloud option or an enterprise SLA.

Other options

If you want to own your auth code and data, Better Auth is open source and has no per-user fee. If you only need SSO and directory sync for B2B deals, look at WorkOS.

Verdict

For most SaaS products, take Clerk: it's the faster route to real auth. Take Auth0 once enterprise identity requirements are real, not before.