Brands AI mentions

Mentioned in on each AI engine, by brand
Mentioned in	ChatGPTChatGPT	Google AI ModeGoogle AI Mode
Auth0	96%	83%
Descope	96%	61%
Stytch	96%	57%
Clerk	61%	61%
FusionAuth	30%	57%

Questions and answers

Google AI ModeOct 26, 2026

Several developer-first and enterprise identity platforms provide robust APIs and SDKs supporting magic links, biometrics, FIDO2 hardware keys, and WebAuthn passkeys.

Top API-driven options for building a passwordless architecture include:

1. Stytch

Overview: Built from the ground up specifically for passwordless authentication, Stytch provides developer-friendly APIs and comprehensive UI components/SDKs.
Supported Methods: Email and SMS magic links (with smart link detection for secure corporate email filters), WebAuthn/passkeys, hardware FIDO2 keys, biometrics (native iOS and Android biometric login), and OTP codes.
Best For: Developers who want granular control over their UI/UX while offloading complex cryptographic session management and WebAuthn flows.

2. Descope

Overview: A visual, drag-and-drop workflow platform with backend APIs that simplifies implementing multi-step, multi-factor, and passwordless authentication.
Supported Methods: Magic links, WebAuthn passkeys, FIDO2, biometrics, social login, and risk-based step-up auth.
Best For: Teams looking to orchestrate complex auth flows visually without writing hundreds of lines of frontend/backend state logic.

3. Auth0 (by Okta)

Overview: An enterprise-grade Identity and Access Management (IAM) platform with mature APIs and extensive customization hooks via Actions.
Supported Methods: Universal/native passkeys (FIDO/WebAuthn), email and SMS magic links, biometrics (FaceID/TouchID integrations), and standard social/enterprise connections.
Best For: Large-scale or enterprise applications that need rigorous compliance, multi-tenant directory support, and a heavily battle-tested ecosystem.

4. Clerk

Overview: An exceptionally fast-growing user management and auth toolkit built heavily for modern web frameworks (Next.js, React, Remix).
Supported Methods: Email/SMS magic links, WebAuthn passkeys/biometrics, and social identities.
Best For: Rapid application development where you want drop-in components that look modern out of the box.

Comparison at a Glance

Platform	Magic Links	WebAuthn / Passkeys	FIDO2 Hardware	Native Mobile Biometrics	Primary Strength
Stytch	Yes	Yes	Yes	Yes (Mobile SDK)	Developer-first API flexibility
Descope	Yes	Yes	Yes	Yes	Visual workflow builder & low-code
Auth0	Yes	Yes	Yes	Yes	Enterprise scale and governance
Clerk	Yes	Yes	Yes	Yes	Frictionless frontend UI integration

If you can share your tech stack (e.g., React/Next.js, Python/Django, iOS/Android mobile app) and whether you prefer pre-built UI components or headless APIs , I can recommend which of these options fits your project best.

Sources cited in this answer6

ChatGPTOct 26, 2026

If you want one authentication API that supports magic links, biometric authentication, FIDO2 security keys, and WebAuthn passkeys, I’d start by evaluating Auth0, Stytch, Descope, Clerk, and FusionAuth. They offer different trade-offs in terms of implementation effort, flexibility, and control over the authentication experience.

One important distinction: biometrics, FIDO2, and passkeys aren't four entirely separate authentication methods. WebAuthn passkeys can use a fingerprint, face recognition, or a device PIN to verify the user, and they can also work with external FIDO2 security keys. Magic links are a separate, email-based authentication method.

APIs worth evaluating

1. Auth0

(Broad feature set)

A mature, full-featured identity platform with passwordless email authentication, passkeys/WebAuthn, biometric verification through the device authenticator, and enterprise identity features.

Best for: applications needing flexible authentication policies, OAuth/OIDC, SSO, and extensibility.

Docs: Passwordless authentication · Authentication platform.

2. Stytch

An API- and SDK-oriented option supporting email magic links, WebAuthn, passkeys, sessions, and user management. Its consumer and B2B products target different application architectures.

Best for: teams that want to build a custom login UI and integrate authentication directly into an application.

Docs: Stytch API specifications · Mobile SDKs.

3. Descope

Supports magic links, passkeys, biometrics through WebAuthn, email/SMS OTPs, and configurable authentication flows. You can use its visual flow builder or integrate through SDKs and REST APIs.

Best for: rapidly implementing several login methods, custom journeys, or passwordless authentication alongside an existing identity system.

Docs: Authentication methods · Passwordless authentication.

4. Clerk

Offers developer-friendly authentication components and SDKs, magic-link and other passwordless sign-in options, and passkey registration and authentication.

Best for: React and Next.js applications where you want a polished login experience with less UI and session-management work.

Docs: Sign-up and sign-in strategies · Custom passkey flows.

5. FusionAuth

Provides passwordless login APIs, passkey/WebAuthn support, and the option to use hosted login pages or build a more customized experience. Deployment and licensing options are worth evaluating if you need greater infrastructure control.

Best for: teams wanting ownership of their identity architecture or a self-managed deployment option.

Docs: Passwordless API · Passkey integration.

6. Hanko

A strong candidate when passkeys are the main requirement. Its Passkey API supports WebAuthn credentials, including hardware security keys, and can be integrated into an existing authentication system. It also offers self-hosting.

Best for: teams that want dedicated passkey infrastructure rather than a full identity platform. You would generally pair it with a separate magic-link implementation if you need both methods.

Docs: Hanko Passkey API.

Feature comparison

This is a practical shortlist, not a guarantee that every feature is available in every SDK, plan, or deployment.

API	Magic links	Passkeys / WebAuthn	Hardware FIDO2 keys	Custom or self-hosted control
Auth0	Yes	Yes	Via WebAuthn	Customizable hosted/embedded flows
Stytch	Yes	Yes	Via WebAuthn	API- and SDK-oriented
Descope	Yes	Yes	Via WebAuthn	Flexible flows and federation
Clerk	Yes, depending on flow/platform	Yes	Via WebAuthn	Custom flows; managed service
FusionAuth	Yes	Yes	Via WebAuthn	Deployment options
Hanko	Separate integration generally needed	Core feature	Yes	Self-hosted option

Sources: official documentation for Auth0, Stytch, Descope, Clerk, FusionAuth, and Hanko.

Other options worth considering

Supabase Auth — convenient if your application already uses Supabase. It supports email magic links and has experimental passkey support, which currently requires explicit opt-in. Passkey documentation.
WorkOS AuthKit — particularly relevant for B2B applications that need Magic Auth, SSO, and enterprise identity features. Verify the exact passkey support for your intended flow. Magic Link documentation.
Native WebAuthn API — use navigator.credentials.create() and navigator.credentials.get() directly in the browser, with a server-side FIDO2 library for challenge generation and credential verification. This gives you more control but requires more implementation and security work. MDN WebAuthn guide · Google's server-side guide.

My recommendation

Best general-purpose starting point: Auth0.
Best API-first approach: Stytch.
Best for configurable, multi-method flows: Descope.
Best for React/Next.js developer experience: Clerk.
Best if passkeys are the primary feature and self-hosting matters: Hanko.

Whichever you choose, verify three things before committing:

Hardware security keys: Confirm support for roaming FIDO2 authenticators, not just platform passkeys.
Biometrics: On the web, biometrics are normally handled by the device or passkey provider through WebAuthn. Your app should not collect or store fingerprint or face data.
Recovery and account linking: Support safe fallback when a user loses a device, changes email addresses, or needs to register another passkey.

One question that would help narrow this to the best two or three APIs: What are you building?

1. Application platform

Web app (React, Next.js, or other)

Native iOS / Android app

Web and mobile

Backend API or custom authentication service

2. Infrastructure preference

Managed auth service; minimal maintenance

Self-hosted or open-source preferred

Maximum control; implement more ourselves

3. Intended users

Consumer application (B2C)

Business / enterprise (B2B)

Internal workforce authentication

[Compare the best options]

Sources cited in this answer19

Google AI ModeOct 17, 2026

Several major identity and authentication platforms offer robust APIs/SDKs that support both email magic links (passwordless links sent to an inbox) and biometric authentication (via FIDO2/WebAuthn passkeys, FaceID, or TouchID integration).

The primary providers offering both capabilities include:

1. Auth0 (by Okta) : Supports email-based passwordless magic links alongside modern FIDO2/WebAuthn-powered passkeys, which leverage device-native biometrics like facial recognition or fingerprints. You can implement these via their Auth0 Passwordless Documentation and Auth0 Passkey Documentation.
1. Clerk : A developer-first authentication platform that natively supports email magic links, one-time passwords, and passkeys (which rely on device biometrics across web and mobile ecosystems like Android and iOS). Implementation guidelines are available on the Clerk Android Passkeys Guide.
1. Descope : A visual workflow-based CIAM (Customer Identity and Access Management) platform explicitly built around passwordless journeys. It provides drag-and-drop APIs and SDKs to combine magic links, social login, and biometric passkeys seamlessly.
1. Stytch : A developer platform built specifically for passwordless authentication. Stytch's API natively supports email magic links, SMS/WhatsApp passcodes, and WebAuthn/biometric authenticators.

If you'd like to narrow this down, let me know:

Are you building for web, mobile (iOS/Android), or both?
Do you prefer a hosted UI or headless APIs for custom frontend design?

I can recommend the most cost-effective and straightforward provider for your stack.

Sources cited in this answer3

ChatGPTOct 17, 2026

Several identity and authentication platforms offer APIs that support magic-link login and biometric authentication. The best fit depends on whether you need a web app, a native mobile app, or enterprise identity management.

One important distinction: biometric login is often implemented through passkeys/WebAuthn, which let a user verify their identity with Face ID, Touch ID, Android biometrics, Windows Hello, or a device PIN. The biometric check typically happens on the user's device, not on the authentication provider's servers.