Stack Auth (YC S24)
Open-source Auth0/Clerk alternative
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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