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Stack Auth vs Zitadel
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Authentication & Identity
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Authentication & Identity
Overview
Focus
Authentication & Identity
Identity & Access Management
Product
Stack Auth is an open-source authentication platform for modern web applications with support for organizations, roles, and hosted auth workflows.
Zitadel is an open-source identity management platform providing authentication, authorization, and user management with multi-tenancy support for B2B SaaS applications.
Headquarters
San Francisco, California
Bern, Switzerland
Company size
2-10 employees
11-50 employees
Founded
2024
2019
Pricing details
Free options
Free plan, Free trial
Free plan, Free trial
Source updated
Oct 29, 2026
Oct 29, 2026