Alternatives

Products that do what An open source OAuth/auth system does

Can be deployed to Cloudflare or fully selfhosting. A simple demo site available with only Password Sign-in/Sign-up, OTP MFA, Passkey enrollment features enabled, no real email needed: https://auth-demo.valuemelody.com/

1. 1HO
   Hydra – Open-Source OAuth2 Server▲190

   2019 · gethydra.sh

2. 2
   SuperTokens▲146

   Open source email & password auth for developers

   2020

3. 3
   Authentiq▲157

   Strong authentication, without the passwords

   2017

4. 4OS
   Open-Source Auth for NextJS / React▲107

   2021 · ory.dev

5. 5AM
   A microservice that makes adding authentication to your app easy▲89

   2017 · github.com

6. 6RY
   Run your own OAuth2/OpenID Connect provider▲161

   2016 · github.com

7. 7
   EmDash CMS▲126

   EmDash is a new open-source CMS from Cloudflare

   Apr 2026

8. 8BA
   Base – API for authentication, email sending, images and more▲140

   2019 · base-api.io

9. 9
   Simple OTP 2.0▲131

   Passwordless, source-code-included auth for your website

   2024

10. 10
    SuperTokens Passwordless▲173

    Fully flexible, open source auth in 15 minutes

    2022

11. 11
    NoPass.me▲129

    Open-source identity verification

    2021

12. 12EI
    Emauth.io – Free service for Slack-style passwordless login links▲36

    2020 · emauth.io

13. 13
    AuthPass▲75

    Simple, open source, cross platform password manager 😅️

    2020

14. 14
    Autho▲152

    cross-platform login box for web and native apps.

    2014

15. 15OM
    OAuth microservice for FB, Twitter, etc.▲127

    2017 · login-with.com

16. 16
    Logto Cloud (Preview)▲129

    Comprehensive alternative to Auth0

    2023

17. 17KA
    Keratin AuthN – Accounts and Auth Microservice in Go▲104

    2017 · keratin.tech

18. 18IB
    I built a free, simple login service. Would you use this?▲93

    2020 · login.land

19. 19MO
    Mashape open-sources Guardian to solve your OAuth headaches▲25

    2014 · guardianjs.com

20. 20RY
    Run your own OAuth2 and OpenID Connect Provider▲88

    2016 · github.com

21. 21OS
    Open Source Auth w/ Passkeys▲5

    2024 · github.com

22. 22TE
    The easiest 2-factor auth▲27

    2014 · developer.mepin.com

23. 23LA
    LoginBox – Authentication, payments and memberships from a single box▲53

    2015 · loginbox.io

24. 24VE
    Visa – Easy third party auth (OAuth 2.0) for flutter apps▲53

    2020 · github.com

Ranked by how close each launch is in meaning, then by votes. Refine with a description →