Clerk

Hosted auth with drop-in React UI

Free tier + paidAuth & user managementclerk.com

What it is

Hosted authentication with prebuilt React and Next.js components — sign-in, user profile and organization UI you drop in as JSX. Handles sessions, MFA, passkeys, social login and B2B organizations. Billing is measured in monthly retained users rather than raw signups, so users who never return are never charged.

Why it earns a slot

Fastest zero-to-login path in the React world: drop in the SignIn component and you have a styled production auth page in minutes. The Feb 2026 jump to 50k free users made it viable far longer than before.

Know before you commit

The free tier jumped to 50k MRU in February 2026, but enterprise SSO, user impersonation and enhanced B2B org features sit behind $100/mo add-ons that stack on top of Pro. Clerk-hosted components mean your login UI lives in their iframe-free but proprietary React layer.

Getting started

npm i @clerk/nextjs

Field notes

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Pricing snapshot

Free to 50k MRU · $25/mo Pro then $0.02/MRU

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate Clerk (https://clerk.com) for this project, then use it only if it fits what we are already building.
Context: Hosted auth with drop-in React UI. Hosted authentication with prebuilt React and Next.js components — sign-in, user profile and organization UI you drop in as JSX. Handles sessions, MFA, passkeys, social login and B2B organizations. Billing is measured in monthly retained users rather than raw signups, so users who never return are never charged.
Reviewer notes (general, not written for this codebase): Fastest zero-to-login path in the React world: drop in the SignIn component and you have a styled production auth page in minutes. The Feb 2026 jump to 50k free users made it viable far longer than before.
Watch out for: The free tier jumped to 50k MRU in February 2026, but enterprise SSO, user impersonation and enhanced B2B org features sit behind $100/mo add-ons that stack on top of Pro. Clerk-hosted components mean your login UI lives in their iframe-free but proprietary React layer.
Pricing: Free to 50k MRU · $25/mo Pro then $0.02/MRU
Setup: npm i @clerk/nextjs
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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Neighbourhood

How Clerk sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.