Hanko is described as 'Modern open source Authentication & User Management system – built and hosted in the EU. Alternative to Clerk, Auth0, Stytch, Descope' and is a identity management tool in the security & privacy category. There are more than 25 alternatives to Hanko for a variety of platforms, including Web-based, SaaS, Self-Hosted, Android and iPhone apps. The best Hanko alternative is VoidAuth, which is both free and Open Source. Other great apps like Hanko are Keycloak, Authelia, ZITADEL and AuthKit.
Okta's main product is workforce protection. Their Hanko alternative is Auth0 which they acquired a while ago.