Clerk

Hosted authentication and user management with drop-in UI components.

Best for: Adding sign-in, users and organizations to a React/Next.js app quickly.
Open source: no
Pricing: Hobby free; Pro $20/month billed annually (50,000 MRU per app included, then $0.02 each); Business $250/month billed annually; Enterprise custom. (source: official page, checked 2026-10-21)
Last checked: 2026-10-21 (pricing 2026-10-21 · licence not checked)

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Pricing is copied from each tool's official page on the date shown and left out where we couldn't read it; prices change. Licences were checked on GitHub; 'unconfirmed' means not verified. No affiliate links.