Clerk | Yes - 10k MAU | $0.02/MAU after 10k | No | No | SMS, TOTP, Backup codes | Yes (Pro plan) | React, Next.js, Remix, Astro, Vue | Google, GitHub, Microsoft, Apple, Discord, X | Yes |
Auth0 | Yes - 7.5k MAU | Starts at $35/month | No | No | SMS, TOTP, Email, Push | Yes | React, Angular, Vue, Native SDKs | Google, GitHub, Facebook, Twitter, LinkedIn, Apple | Yes |
Supabase Auth | Yes - 50k MAU | $0.00325/MAU after 100k | Yes | Yes | TOTP | Yes (Row Level Security) | React, Vue, Svelte, SolidJS | Google, GitHub, GitLab, Bitbucket, Azure, Discord | Yes |
Auth.js (NextAuth) | Yes - Unlimited (self-hosted) | Free (open source) | Yes | Yes (required) | Via custom implementation | Custom implementation | Next.js, SvelteKit, Express, Qwik | Google, GitHub, Facebook, Twitter, 80+ providers | Yes |
Firebase Auth | Yes - Unlimited | Free (pay for usage) | No | No | SMS, TOTP | Via Firebase Security Rules | React, Angular, Vue, Flutter, iOS, Android | Google, Facebook, Twitter, GitHub, Microsoft, Apple | Yes |
Lucia | Yes - Unlimited (library) | Free (open source) | Yes | Yes (library) | Custom implementation | Custom implementation | Framework agnostic | Via Arctic (50+ providers) | Yes (built-in) |
WorkOS | Yes - 1M MAU | $2,500/1M MAU after 1M | No | No | SMS, TOTP | Yes | React, Next.js, Vanilla JS | Google, Microsoft, GitHub + Enterprise SSO/SAML | Yes |
Keycloak | Yes - Unlimited (self-hosted) | Free (open source) | Yes | Yes (required) | OTP, WebAuthn | Yes (built-in) | JavaScript, Java, Node.js adapters | Google, GitHub, Facebook, SAML, LDAP | Yes |