Clerk
Drop-in authentication and user management with prebuilt UI components for React and Next.js apps.
- Verified facts
- 4 of 4
- Alternatives ranked
- 7
- Approved reviews
- 0
- Visits sent from here
- 0
About Clerk
Clerk is a hosted auth service built around ready-made components: you add sign-in, sign-up, user profile and organisation switcher widgets to your app and Clerk handles sessions, passwords, social logins, passkeys, MFA and bot protection behind them. It is especially popular in the Next.js and React world, with first-class SDKs for those frameworks, though it also supports Remix, Astro, Expo, plain JavaScript and several back-end languages. B2B features include organisations, roles, invitations, enterprise SSO and directory sync, and newer products add billing and API keys for machine access. The free Hobby plan covers a lot of users, and paid plans add a monthly base price plus per-user and per-connection charges. It is a cloud-only service, so your user data lives with Clerk. Developers like how quickly it gets a polished login working; the trade-off is less control over flows than a self-hosted library.
Best for: React and Next.js developers who want polished sign-in screens working in minutes.
Pros and cons
What works
- Prebuilt, customisable UI components save weeks of work
- Excellent Next.js and React integration
- Generous free tier per application
Why people leave
- Cloud only; user data cannot be self-hosted
- Enterprise SSO connections are billed individually
- Less flexible than code-first libraries for unusual flows
Top Clerk alternatives
See all 7- 1
Auth066.5More mature enterprise features and SDK coverage beyond the JavaScript world.
- 2
Better Auth62.6Free open-source TypeScript library that keeps users in your own database.
- 3
Kinde59.6Similar developer-friendly hosted auth with billing and feature flags included.
- 4StStytch57.2
API-first alternative with strong fraud and bot protection for consumer and B2B apps.
- 5
WorkOS55.3Free for the first million users and strong on enterprise SSO for B2B products.
Why people left Clerk
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Clerk: common questions
Is Clerk free?
Clerk has a free plan and paid plans. Free plan: Up to 50,000 monthly retained users per app (checked on Clerk's own site).
Is Clerk open source?
No, Clerk is not open source. Open-source alternatives include Better Auth, SuperTokens and Supabase.
What platforms does Clerk run on?
Clerk is available for Web, iOS and Android.
What are the best alternatives to Clerk?
The highest-ranked Clerk alternatives right now are Auth0, Better Auth and Kinde. See the full ranked list for pricing, platforms and verified facts.