Clerk
Drop-in user authentication and account management for modern web apps
About Clerk
## Intro Clerk is an authentication and user management service for developers and AI-assisted builders. Instead of building sign-up, sign-in and profile screens yourself, you drop in Clerk's prebuilt components and it handles sessions, security and user data for you. It is popular with people building on Next.js and with vibe coders using AI coding tools who need working logins fast. Auth is one of the easiest places to make a costly security mistake, so handing it to a dedicated service is a sensible call for most small teams. ## Key features - **Prebuilt UI components.** Ready-made sign-up, sign-in and user profile screens are available on every plan, plus APIs if you want to build a custom flow. SDKs are highlighted for React, Next.js and Expo. Clerk manages sessions, user records and profile updates for you, and the dashboard lets your team see and manage users. Paid plans keep logs longer, from 1 day on Hobby to 7 days on Pro and 30 days on Business. - **Organizations for B2B apps.** Teams, invites and member roles are built in. 100 monthly retained organizations are included per app, and an add-on unlocks unlimited members, custom roles and domain-based auto-join. - **Clerk Billing.** Prebuilt pricing page and subscription management components sit on top of Stripe, so you can charge for your app without wiring up billing logic from scratch. - **Security options.** Paid plans add multi-factor authentication, SMS authentication and custom session lifetimes. Business customers can add SSO connections and directory sync. You get 5 free user impersonations per month, so you can see exactly what a customer sees when they report a problem. An add-on unlocks unlimited impersonations. ## Best for Clerk is best for founders building SaaS products or internal apps on React, Next.js or Expo who want production-grade auth in an afternoon. It is a strong fit for B2B products that need teams and organizations from day one, and for anyone who wants auth and subscriptions handled together. If you are building inside a no-code builder that already includes user accounts, such as Bubble or Softr, you probably do not need it. It also makes sense for agencies shipping several client apps, since the Hobby plan allows unlimited applications and up to 3 dashboard seats. ## Pricing summary The Hobby plan is free and includes 50,000 monthly retained users per app, which covers most early products. Pro costs $25 per month, or $20 per month billed annually, and adds MFA and removes Clerk branding. Business is $300 per month ($250 annually). Clerk Billing charges 0.7% of billing volume on top of Stripe's fees. Extra retained users above 50,000 cost $0.02 each per month, falling at higher volumes. ## Quick verdict Clerk is one of the fastest ways to add polished, secure logins to a code-based app, and the free tier is generous enough for most early products. The trade-offs are vendor lock-in and add-on costs that creep up once you need enterprise SSO or large organizations. For most early-stage builders, it is worth it. Start on Hobby, and only upgrade when you need MFA or want the Clerk branding removed.
