Stack Auth (YC S24)
Open-source Auth0/Clerk alternative
Stack Auth (YC S24) launched on August 2, 2024 with 424 votes, #83 of 5,471 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Stack Auth is an open-source authentication and authorization platform designed as an alternative to Auth0 and Clerk. Aimed at developers, it offers managed user authentication with pre-built components that can be integrated within minutes. The platform is fully open-source and self-hostable, giving developers control over their deployment while reducing setup complexity. It provides a developer-friendly approach to handling authentication needs for applications.
written from the facts on this page · September 2026
From the sources
Stack Auth is managed user authentication & authorization. It is developer-friendly and fully open-source & self-hostable. Within 5 minutes, you can setup Stack and use its components such as and .
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Does a similar job
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Stack, an open-source Clerk/Firebase Auth alternative2024 · stack-auth.com · ▲144Hey 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!
- CAClerk – all of user management as-a-service, not just authentication2021 · clerk.dev · ▲582
The task came with a sense of helplessness. We knew what "great" looked like, but it was impractical to build all of that functionality.
- OSOpen Source Authentication and Authorization2022 · ▲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…
Open-source Auth0 alternative Ory Kratos v0.13 released – nearing v1.02023 · github.com · ▲88Headless 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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