Aserto is described as 'Application authorization as a service. It helps developers add real-time resource-level access controls to their applications. SDKs and quickstarts for every popular languages are available to help you get up and running quickly' and is an app. There are more than 10 alternatives to Aserto for a variety of platforms, including Self-Hosted, SaaS, Web-based, Amazon Web Services and Python apps. The best Aserto alternative is Keycloak, which is both free and Open Source. Other great apps like Aserto are ZITADEL , Authelia, Amazon Cognito and AWS Identity and Access Management.