Stytch
By Stytch
Stytch is a passwordless authentication infrastructure provider that gives developers APIs and SDKs for implementing login flows such as magic links, one-time passcodes, biometric passkeys, and SMS verification without requiring users to…
Definition
Stytch is a passwordless authentication infrastructure provider that gives developers APIs and SDKs for implementing login flows such as magic links, one-time passcodes, biometric passkeys, and SMS verification without requiring users to create or remember passwords. It targets both consumer and B2B applications that want to reduce password-related security risk and friction while retaining full control over their own user interface.
Overview
Passwords remain one of the most common sources of account compromise, through reuse, phishing, and weak credential choices, while also creating friction at signup and login that measurably affects conversion. Stytch was built on the premise that authentication should default to methods that do not depend on a shared secret the user must remember, replacing passwords with possession- or biometric-based verification instead. Stytch exposes authentication as a set of backend APIs rather than a hosted login page, so a product team builds its own sign-in interface and calls Stytch to send a magic link email, deliver a one-time SMS or email passcode, or verify a WebAuthn-based passkey using the device's fingerprint or face recognition. Session tokens issued after successful verification are then used by the application to authorize subsequent requests. For B2B use cases, Stytch also offers organization and role management along with single sign-on support for enterprise customers. Within authentication infrastructure, Stytch is most directly compared with Auth0 and WorkOS, both of which also offer developer-facing identity APIs, and with Frontegg, which layers on more prebuilt UI and self-service admin tooling. Stytch's particular emphasis is on passwordless methods as the default rather than an optional add-on to a traditional password flow, and on giving engineering teams API-level control rather than a hosted, less customizable login experience. This division of responsibility also means that as new authentication methods emerge, an application can often adopt them by enabling a new Stytch product rather than re-implementing its login flow from scratch. In practice, consumer apps use Stytch to reduce signup friction with magic links or passkeys instead of asking new users to create a password, while B2B products use it to combine passwordless consumer-facing login with enterprise SSO for larger customers. Security teams favor passwordless flows because they eliminate entire classes of credential-stuffing and password-reuse attacks by removing the shared secret altogether. Adopting Stytch means building custom UI around its APIs rather than using an out-of-the-box hosted login page, which requires more upfront engineering work than some competitors' drop-in widgets. It also introduces a dependency on Stytch's delivery infrastructure for email and SMS codes, and organizations must still support account recovery flows for users who lose access to their passkey device or registered phone number. Because verification challenges are delivered and confirmed through Stytch's own infrastructure, the application backend never has to implement the mechanics of generating secure one-time codes, managing passkey credential storage, or handling the cryptographic details of WebAuthn assertions itself.
Key Features
- Implements magic link email authentication without passwords
- Supports WebAuthn-based passkeys using device biometrics
- Provides SMS and email one-time passcode verification
- Offers organization and role management for B2B products
- Includes enterprise single sign-on support for larger customers
- Exposes authentication as backend APIs rather than hosted pages
- Issues and manages session tokens after successful verification
- Supports fraud and risk signals alongside authentication events