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Zitadel offers a generous free tier with optional paid upgrades for advanced features.
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Fine-grained, scalable authorization for applications and APIs, delivered in minutes.
Self-hosted is free and open source. Cloud from $100/month. Enterprise available. Apache 2.0 license.
Zitadel is identity management infrastructure. Authentication, authorization, and user management. Auth0 alternative.
Zitadel is open source and self-hostable. Auth0 is more polished. Zitadel for control and cost.
Custom logic in authentication flows. Modify tokens, enrich user data. Extensibility without forking.
Source: zitadel.com