Alternatives

Products that do what Nile-Auth – open-source auth designed for multi-tenant apps does

There are quite a few authentication services and libraries out there, but the vast majority treats tenants / organizations as an afterthought - in case of Firebase, tenants are literally in a different product. In B2B apps, users, tenants and data as fundamentally interrelated - users belong to tenants and authenticate in order to access data that belongs to the tenant. This means that user and auth data belong in the same database where the tenant data is stored (in our case, Postgres), and that the database should be aware of the user identity and control the access to tenant data.…

1. 1
   MonoCloud for Startups▲167

   One identity layer for your customers, APIs, and agents

   Jul 2026 · monocloud.com

2. 2
   SuperTokens▲146

   Open source email & password auth for developers

   2020

3. 3EA
   Etebase – An open source and end-to-end encrypted Firebase alternative▲308

   2020 · etebase.com

4. 4
   Supabase (Beta)▲322

   The open source Firebase alternative.

   2020

5. 5
   Authorizer▲296

   Open source authentication and authorization solution

   2021

6. 6
   authzed▲83

   The platform to store, compute, and validate app permissions

   2021

7. 7
   AuthPass▲75

   Simple, open source, cross platform password manager 😅️

   2020

8. 8
   Biometric Authentication by Passbase▲218

   Combining identity verification and secure user logins

   2021

9. 9
   AuthGuardian by OneGraph▲185

   The easiest 3rd-party sign-in for your apps and APIs

   2020

10. 10
    Tesseral▲141

    Open source authentication infrastructure for B2B software

    2025

11. 11
    Stytch B2B Authentication▲122

    Build enterprise-ready auth into your B2B app

    2023

12. 12
    Autho▲152

    cross-platform login box for web and native apps.

    2014

13. 13HO
    Hydra – Open-Source OAuth2 Server▲190

    2019 · gethydra.sh

14. 14
    FusionAuth▲120

    Auth for any app. Get every feature. Deploy everywhere.

    2018

15. 15
    SimpleID▲150

    Add decentralized auth and storage to your app in 10 minutes

    2019

16. 16BA
    Base – API for authentication, email sending, images and more▲140

    2019 · base-api.io

17. 17
    PropelAuth▲112

    Flexible auth for B2B products

    2023

18. 18
    SuperTokens Passwordless▲173

    Fully flexible, open source auth in 15 minutes

    2022

19. 19
    Authorizer▲21

    Open-source auth for enterprise applications, and AI agents

    4d ago · authorizer.dev

20. 20
    ZITADEL▲82

    Integrate user management and authentication easy as pie

    2022

21. 21
    NoPass.me▲129

    Open-source identity verification

    2021

22. 22AO
    An open source OAuth/auth system▲9

    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/

    2025 · github.com

23. 23
    Liquid▲119

    Seamless and customizable auth and user management

    2024

24. 24
    Rocketgraph▲121

    Build production grade web applications in minutes

    2024

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