Stytch

Stytch is an authentication and identity infrastructure platform that provides APIs and SDKs to securely manage user access in web and mobile applications. Its primary purpose is to help teams replace or avoid building custom auth systems by offering a comprehensive, modular set of authentication, authorization, and user management capabilities. Stytch focuses on secure, low-friction login experiences that can be tailored to both consumer and enterprise use cases.

Core features include passwordless authentication methods (email magic links, SMS one-time passcodes, OAuth, WebAuthn, and biometrics), as well as traditional email/password flows with secure session management. Stytch also supports user provisioning, account linking, and identity federation through SSO (SAML and OIDC) for B2B applications. Security capabilities such as step-up authentication, device fingerprinting, and risk-based controls help teams mitigate account takeover and fraud. Developer tooling includes client and server SDKs, detailed API documentation, environment management, and observability for login and security events.