How is this different from Auth0?

I may be missing something but this looks like an open source project vs. Auth0 which, while it has a free plan, is part of Okta and is a commercial product.

Maybe a better comparison point would be Keycloak. I’d also like to know how it compares to it.

I tried and it seems it's Keycloak with an easy UX, a lot less features, and you're limited to only one realm.

In case you're looking for multi-tenancy with self-service, maybe try out https://github.com/zitadel/zitadel Would be glad to get your thoughts on the platform. (discl: I work for ZITADEL.