Auth0 vs Stytch

The fundamental difference

Auth0 ships a CIAM platform with UI, customization layers, and a vendor relationship. Stytch ships auth APIs and lets you build everything else. Pick based on whether you want a platform or primitives.

When Auth0 wins

• You want a vendor to own the auth UX surface
• You need broad protocol coverage and federation
• Enterprise SSO upsell is on your near-term roadmap
• You don't have engineering capacity to build auth UI from scratch

When Stytch wins

• You have a strong product design team building bespoke flows
• Passwordless-first is the strategy (magic links, OTP, passkeys)
• You want API primitives, not opinionated platform features
• Per-MAU economics favor your scale and use pattern

Common scenarios

• B2C consumer app with custom design system: Stytch
• B2B SaaS moving upmarket: Auth0
• Greenfield startup with React + product polish goals: Either, lean Stytch if passwordless-first
• Marketplace with social login + complex flows: Auth0

Verdict

Stytch is the right call when your team wants to build the UX itself. Auth0 is the right call when you want a platform that does most of the thinking for you.