ZITADEL is a multi-tenant, API-first identity platform with SDKs, a customizable hosted login page, single sign-on, and social logins.
It supports multifactor authentication and passkeys, role-based access control, and machine identities, and it can be self-hosted across different data regions.

ZITADEL is a multi-tenant, API-first identity platform that bridges open-source and enterprise authentication.


Kinde Auth is Kinde's authentication and user management product for developers building B2B and consumer apps.


FusionAuth is a customer identity and access management product that secures access for people, services, and AI agents.


PropelAuth provides B2B authentication software with organization-aware permissions and enterprise single sign-on.


Open-source user authentication for app developers, with prebuilt login UI and SDKs that keep sign-in on the app's domain.



The Ping Identity Platform provides identity and access management for workforce, customer, and AI agent identities.



Auth0-based customer identity and access management for B2C, B2B, and developer-built applications.


Plugin-based authentication framework that runs inside a developer's own application across Next.js, Nuxt, SvelteKit, and other stacks.


Developer-first identity platform providing APIs and SDKs for passwordless authentication, session management, B2B identity, and fraud prevention.


Versine lets platforms authenticate AI agents acting under a user's delegated permission at sign-in.



Universal proof-of-human protocol offering a portable anonymous digital passport that proves unique humanness with zero-knowledge proofs.


Identity governance product from Okta to discover, onboard, protect, and govern AI agents as first-class identities.


Hanko Auth provides open-source authentication and user management for application developers, with cloud hosting and self-hosted deployment.


OneLogin Customer Identity is a customer identity and access management product securing customer authentication at scale.


Alter Vault gives AI agents per-agent identities with keys traceable to a person and scoped delegation.


Passwordless customer identity platform letting consumer apps sign in via passkeys, magic links, codes, and social login through one API.
Kinde Auth is Kinde's authentication and user management product for developers building B2B and consumer apps.

FusionAuth is a customer identity and access management product that secures access for people, services, and AI agents.

PropelAuth provides B2B authentication software with organization-aware permissions and enterprise single sign-on.

Open-source user authentication for app developers, with prebuilt login UI and SDKs that keep sign-in on the app's domain.

Descope provides customer identity software with visual authentication workflows for business and consumer applications.

The Ping Identity Platform provides identity and access management for workforce, customer, and AI agent identities.

AuthKit is WorkOS's drop-in authentication UI with SSO, MFA, social login, and role-based access control.

Auth0-based customer identity and access management for B2C, B2B, and developer-built applications.

Plugin-based authentication framework that runs inside a developer's own application across Next.js, Nuxt, SvelteKit, and other stacks.

Developer-first identity platform providing APIs and SDKs for passwordless authentication, session management, B2B identity, and fraud prevention.

Versine lets platforms authenticate AI agents acting under a user's delegated permission at sign-in.

Open-source identity and access management with single sign-on and social login support.

Universal proof-of-human protocol offering a portable anonymous digital passport that proves unique humanness with zero-knowledge proofs.

Identity governance product from Okta to discover, onboard, protect, and govern AI agents as first-class identities.

Hanko Auth provides open-source authentication and user management for application developers, with cloud hosting and self-hosted deployment.

OneLogin Customer Identity is a customer identity and access management product securing customer authentication at scale.

Alter Vault gives AI agents per-agent identities with keys traceable to a person and scoped delegation.

Passwordless customer identity platform letting consumer apps sign in via passkeys, magic links, codes, and social login through one API.
