ory/kratos

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.

290 best points · 385 comments · 8 Hacker News posts · 13,948 GitHub stars · View on GitHub

Hacker News discussions

• Show HN: Ory Kratos – Open-source identity server written in Go (290 points, 65 comments, by nottennis, 2022-06-09)
• Auth0 OSS alternative Ory Kratos now with passwordless and SMS support (203 points, 112 comments, by oporquinho94, 2024-02-22)
• Ory Kratos v1.0 with passkeys, MFA and multi-region (146 points, 43 comments, by gvusfraber, 2023-07-13)
• Kratos - Cloud native Auth0 open-source alternative (self-hosted) (138 points, 97 comments, by curtistyr, 2025-11-13)
• Show HN: Open-source Auth0 alternative Ory Kratos v0.13 released – nearing v1.0 (88 points, 50 comments, by quartzbox, 2023-04-19)
• Show HN: OSS Auth0 Alternative Ory Kratos Now with Full PassKey Support (41 points, 18 comments, by V0rtexV0xter, 2024-06-06)
• Show HN: Open Source Auth0 alternative Ory Identifier First Auth and OTP MFA (11 points, 0 comments, by zzzzzzzzzz10, 2024-09-26)
• Show HN: Ory Kratos, an open source Auth0 / Clerk alternative (2 points, 0 comments, by vwpolo3, 2025-11-12)