Run your own OAuth2/OpenID Connect provider

In plain words

This is an OpenID Certified OpenID Connect and OAuth2.1 provider written in Go that handles authentication and authorization at scale. It integrates with existing user management systems through headless APIs and can be deployed as a managed service or self-hosted. Organizations can use it to implement single sign-on and secure API authentication without building these systems from scratch.

written from the facts on this page · September 2026

From the sources

Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go. - ory/hydra

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  Run your own OAuth2 and OpenID Connect Provider2016 · github.com · ▲88

  Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go. -

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  Open-source OAuth2 & OpenID server Ory Hydra v22022 · github.com · ▲108

  Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go. -

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  Graceful token refresh for open source OAuth2 Server Ory Hydra2025 · github.com · ▲7

  Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go. -

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  Hydra – Open-Source OAuth2 Server2019 · gethydra.sh · ▲190

  Ory Hydra is the open-source, OpenID Certified® OAuth 2.0 server and OpenID Connect provider. Cloud-native, API-first, and built for scale.

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  Ory Kratos – Open-source identity server written in Go2022 · github.com · ▲290

  Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Factor Auth, SMS, SAML, TOTP, and more. Runs everywhere, runs best on Ory Network.

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  Fosite – OAuth2 framework for Go2016 · github.com · ▲38

  Extensible security first OAuth 2.0 and OpenID Connect SDK for Go. - ory/fosite

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