Zitadel offers a free plan with paid upgrades.
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Write a ReviewSelf-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.