[mffap]

Thanks for mentioning ZITADEL. Co-founder here. Supertokens is a good solution with obviously a lot of open source traction, which is great to see in this space. Expanding to authorization makes a lot of sense. ZITADEL supports both authentication and authorization in a turnkey solution (AuthN, AuthZ, APIs, UI, DB). Looking at Supertoken's roadmap, Zitadel seems to be more feature rich offering Passkeys, OTP, multi-tenancy, account linking and a management ui.