Stack Auth is an open-source authentication and user management platform designed for developers building modern web and SaaS applications. It provides common auth features such as social sign-in, email login, MFA, organizations, teams, and role-based access control. Teams can use it through a managed cloud service or self-host the open-source core.
Stack Auth Cloud has a Free plan with up to 10,000 monthly active users, a Pro plan around $25/month for custom domains, branding removal, and email support, and custom Enterprise pricing for SSO, audit logs, and priority support; self-hosting is available under the open-source license.
Open Source
Stack Auth is strongest for teams that want open-source authentication without rebuilding user management. Its organizations, roles, social login, and self-hosted option make it appealing for SaaS and internal tools. The main trade-offs are a smaller ecosystem and fewer mature enterprise integrations than Auth0 or Clerk. It is best for developers who value code ownership and fast setup.
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