Cost by Monthly Active Users
Feature Comparison
| Feature | Clerk | Auth0 | Supabase | Firebase | Kinde | BetterAuth |
|---|
Which to choose?
Clerk — Best DX and prebuilt UI. Ideal for Next.js/React apps. Priciest at scale.
Auth0 — Enterprise-grade, most mature. Every feature exists but gets expensive.
Supabase Auth — Best value if using Supabase DB. Huge free tier (50k MAU). Open source.
Firebase Auth — Free for email/social. Best for mobile. Google lock-in risk.
Kinde — Best free tier (10.5k MAU), modern API. Great for bootstrapped startups.
BetterAuth — Self-hosted TypeScript library. Truly free, no MAU limits. Needs your infra.