Alternatives

Products that do what Authentica does

APIs to verify users via Nafath, OTP, and Biometrics.

1. 1
   VerifyKit▲175

   Verify your users faster and cheaper than ever

   2022

2. 2
   Nango Auth▲604

   Free OAuth for 250+ APIs

   2024

3. 3
   Prelude Verify▲482

   Verify more users for less cost with our spam-free SMS API

   2024

4. 4
   Keyri▲127

   Turn your app into an ultrasecure authenticator

   2021

5. 5
   NoPass.me▲129

   Open-source identity verification

   2021

6. 6
   Stack Auth (YC S24)▲424

   Open-source Auth0/Clerk alternative

   2024

7. 7
   Verify API by Telnyx▲83

   Secure apps & services with multichannel user authentication

   2021

8. 8
   Authyo Secure logins made simple▲5

   Fast. Flexible. Frictionless MFA for Every App

   2025

9. 9
   Biometric Authentication by Passbase▲218

   Combining identity verification and secure user logins

   2021

10. 10AR
    ApproveAPI – Real-Time user approvals via email, SMS, and push▲183

    2019 · approveapi.com

11. 11
    Email OTP / 2FA by Dexatel Verify▲22

    Verify users safely with Email OTP fallback

    Oct 2025

12. 12
    AuthGuardian by OneGraph▲185

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

    2020

13. 13
    Valora▲109

    Send money like a text message to anyone worldwide

    2021

14. 14
    Sawo Labs▲124

    Allow your users to sign-in without a password or OTPs

    2021

15. 15
    Obsidian 2.0▲126

    OTP authenticator for iOS & macOS

    2021

16. 16
    Checker▲124

    Detect fake signups in under 200ms with an easy-to-use API

    2025

17. 17SA
    Stack, an open-source Clerk/Firebase Auth alternative▲144

    Hey HN! Happy to finally launch Stack. We made it because we like to put apps into production quickly, and authentication & user management was taking up way too much time. We have components like and that automatically adapt to whatever theme & design system you're using. Check the blog post to see the example with Radix UI and Joy UI. Also, there's an admin dashboard for monitoring and editing accounts. Stack is 100% AGPL/MIT-licensed, so you can self-host it. Cheers!

    2024 · stack-auth.com

18. 18OS
    Open Source Authentication and Authorization▲128

    I’m Rishabh and the co-founder and CTO at https://supertokens.com (YC S20). We offer open-source user authentication and we just released our user roles product for companies implementing authorization. Our users are web developers, and a prominent and adjacent pain point for our users is authorization. Developers typically implement two independent solutions for authentication and authorization. Offering AuthN and AuthZ in a single solution is something we’ve been thinking about for the last few years. Quick primer, authentication is knowing who the user is, and authorization is…

    2022

19. 19
    Everify▲69

    SMS verification made dead-simple, secure and cheap.

    2021

20. 20
    Mtalkz ▲2

    Fast OTP Delivery Across SMS, WhatsApp & Voice

    Jun 2026 · mtalkz.com

21. 21
    WhatsApp OTP Verification▲4

    Send OTPs via WhatsApp with one blazing fast, low-cost API.

    Nov 2025

22. 22
    Phone-verif.com public opening▲8

    Reverse-OTP phone verification over WhatsApp

    Jul 2026 · phone-verif.com

23. 23OO
    Obsidian - OTP Authenticator▲36

    2021 · obsidianapp.io

24. 24AO
    Authian – Open Source 2-Factor Authentication Using Instant Messengers▲37

    2017 · authian.org

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