Clerk
User management and authentication with pre-built UI components for React, Next.js, and more.
Best for Next.js and React apps that need drop-in auth UI components with minimal setup.
Use Cases
Free Tier
10K monthly active users, 100 organizations, social login
How to Maximize the Free Tier
Clerk's 10K MAU free tier is generous — enough for beta launches and early-stage products. Set up social login (Google, GitHub) immediately to offload authentication UX to providers. The 100 free organizations work well for B2B SaaS MVPs. Watch the pricing jump from free to $25/month — plan your migration path early. Clerk's pre-built components handle 90% of auth UI; use custom components only when you absolutely need unique branding.
Getting Started
Sign up → create application → copy API keys → install `@clerk/nextjs` or `@clerk/react` → wrap app with `<ClerkProvider>` → add `<SignIn />` component → users auto-managed.
Pros
- Pre-built UI: Drop-in auth components (sign-in, sign-up, user profile) that work out of the box with your framework
- MAU allowance: 10,000 monthly active users on the free tier — generous for beta launches and early-stage products
- Social auth: Social login and multi-factor authentication included on the free plan — no extra per-provider costs
Cons
- Hosted UI lock-in: The pre-built components are hosted by Clerk — deep customization requires moving to custom UI
- Org limits: Organization features (teams, roles, permissions) are limited on the free tier — advanced orgs need paid
- Price jump: Pricing jumps significantly after the free tier — from free to $25+/month for the next tier