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§ Private Profile · San Francisco, CA, USA
The open-source Auth0 alternative
Stack Auth has raised $500K across 1 funding round.
Key people at Stack Auth.
Stack Auth was founded in 2024 by Konstantin Wohlwend (Founder) and Zai Shi (Founder).
Stack Auth has raised $500K in total across 1 funding round.
Stack is the open-source authN, authZ, and user management platform.
We build for devs who want to iterate quickly, offering both managed auth and self-hosting. You can set it up in one minute and scale with the project as it grows.
Stack was built by repeat founders with strong technical backgrounds. Check out our GitHub: https://github.com/stack-auth/stack
Key people at Stack Auth.
Stack Auth is an open-source authentication platform designed as a powerful alternative to Auth0, offering developers full control over user authentication without costly subscriptions or vendor lock-in. It provides a comprehensive suite of authentication features—including password authentication, OAuth integrations, single sign-on (SSO), multi-factor authentication (2FA), role-based access control (RBAC), and team management—tailored especially for Next.js developers but applicable more broadly. By enabling self-hosting and complete data ownership, Stack Auth addresses common pain points of proprietary services like Auth0, such as high costs, limited customization, and privacy concerns[1][2][6].
For an investment firm, Stack Auth represents a mission-driven project focused on democratizing secure authentication by empowering developers with open-source tools that reduce dependency on expensive, closed-source platforms. Its investment philosophy would likely emphasize supporting open-source infrastructure projects that enhance developer autonomy and security. Key sectors include identity and access management (IAM), developer tools, and cybersecurity. Its impact on the startup ecosystem lies in lowering barriers to implementing robust authentication, enabling startups to build secure applications without vendor lock-in or prohibitive costs.
For a portfolio company, Stack Auth builds an authentication product serving developers and companies needing flexible, secure user management. It solves the problem of expensive, rigid authentication services by providing a customizable, self-hosted solution that supports modern security standards and developer-friendly APIs. The product has gained growth momentum through community adoption, active development, and positive user feedback highlighting ease of migration from proprietary platforms like Clerk[1][2][6].
Stack Auth was founded recently, emerging from the recognition that dominant players like Auth0, while enterprise-focused, suffer from vendor lock-in, high costs, and limited developer-friendliness. The founders, experienced in developer tools and authentication challenges, built Stack Auth as a fully open-source, MIT/AGPL-licensed alternative that can be self-hosted or used via managed hosting without lock-in. Early traction came from developers and startups seeking an Auth0 replacement that offers full control over authentication flows and user data, with a simple setup and active community support[5][6].
Stack Auth rides the growing trend toward open-source infrastructure and developer empowerment in identity and access management. As enterprises and startups increasingly demand privacy, customization, and cost control, open-source alternatives to proprietary CIAM (Customer Identity and Access Management) platforms gain traction. The timing is favorable due to rising concerns about data ownership, regulatory compliance complexities, and the need for flexible authentication solutions that integrate seamlessly with modern web frameworks like Next.js. Stack Auth influences the ecosystem by providing a viable, community-supported alternative that challenges vendor lock-in and promotes innovation in authentication technology[1][2][5].
Looking ahead, Stack Auth is poised to expand its feature set and ecosystem integrations, potentially addressing compliance certifications to appeal to larger enterprises. Trends such as passwordless authentication, decentralized identity, and enhanced privacy regulations will shape its development. Its influence may grow as more startups and mid-sized companies seek open-source, customizable authentication solutions that scale without escalating costs. The project’s success will depend on maintaining strong community engagement, evolving security standards, and balancing ease of use with enterprise-grade capabilities. Stack Auth’s open-source ethos and developer-first approach position it well to become a foundational tool in the modern identity landscape[1][2][5].
Stack Auth has raised $500K across 1 funding round. Most recently, it raised $500K Seed in September 2024.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Sep 1, 2024 | $500K Seed | — | Y Combinator | Announced |
Stack Auth was founded in 2024 by Konstantin Wohlwend (Founder) and Zai Shi (Founder).
Stack Auth has raised $500K in total across 1 funding round.
Stack Auth's investors include Y Combinator.
