Monday, June 15, 2026

Identity servers: ZITADEL, SuperTokens, Clerk

zitadel/zitadel: ZITADEL - Identity infrastructure, simplified for you. @GitHub

ZITADEL is an open-source identity and access management platform built for teams that need more than basic auth. Whether you're securing a SaaS product, building a B2B platform, or self-hosting a production IAM stack — ZITADEL gives you everything out of the box: SSO, MFA, Passkeys, OIDC, SAML, SCIM, and a battle-tested multi-tenancy model.

No vendor lock-in. No compromise on control. Just a robust, API-first identity platform you can own.

Go, AGPL3, Postgres



SuperTokens @GitHub
Java, Apache2

Our architecture is different than other auth providers as your backend API layer sits in the middle of your frontend and SuperTokens. This enables easy customizations to our auth logic and also enables us to provide a secure session solution.

Backend SDKs Available:

Frontend SDKs Available:





Clerk @GitHub

Clerk is a complete suite of embeddable UIs, flexible APIs, and admin dashboards to authenticate and manage your users.








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