Stormpath vs Casbin: What are the differences?

Stormpath: User Management and Authentication for Developers. Stormpath is an authentication and user management service that helps development teams quickly and securely build web and mobile applications and services; Casbin: An authorization library that supports access control models like ACL, RBAC, ABAC in Golang. In Casbin, an access control model is abstracted into a CONF file based on the PERM metamodel (Policy, Effect, Request, Matchers). So switching or upgrading the authorization mechanism for a project is just as simple as modifying a configuration. You can customize your own access control model by combining the available models.

Stormpath and Casbin can be categorized as "User Management and Authentication" tools.