Auth0
Secure access for everyone. But not just anyone.
★ 4.3
Identity platform for applications to authenticate and authorize users. Part of Okta, offering B2C and B2B authentication solutions.
Features
✓ Social login (unlimited connections)
✓ Multi-factor authentication (OTP, Duo, WebAuthn)
✓ Single sign-on (SSO) with Okta
✓ User management
✓ Passwordless (SMS, email, Passkey, OTP)
✓ Machine-to-machine authentication
✓ Custom domains
✓ Role-based access control (paid)
✓ Organization management for B2B
Pros
- + Generous free tier (25,000 MAU for B2C)
- + Comprehensive feature set including passwordless
- + Great developer documentation
- + Enterprise-grade security
Cons
- − Expensive at scale ('growth penalty')
- − Complex pricing structure with B2C/B2B split
- − Professional B2B requires sales contact
- − Step-function pricing jumps at thresholds