Tesseral is an open-source authentication solution that aims to provide a robust framework for managing user authentication, particularly in B2B contexts. User comments highlight varying perspectives on the necessity of such a service given the simplicity of existing auth methods. Some users are satisfied with their custom-built solutions, while others point out that added features in libraries like Tesseral could enhance scalability and usability for complex applications. Comparison to Keycloak suggests users are looking for alternatives that may better fit their operational needs. Additionally, concerns about dependencies, specifically with AWS, indicate that geographical preferences are influencing adoption decisions, especially in Europe.