Clerk is an authentication solution that provides a developer-centric approach with customizable pre-built components, suitable for teams looking for a cost-effective solution without sacrificing customization options. Auth0 offers a more traditional out-of-the-box authentication solution with basic customization options, catering to developers seeking a hassle-free experience. WorkOS targets service providers looking to rapidly upgrade their applications for enterprise adoption, providing enterprise-grade authentication features and an admin portal that streamlines the onboarding process.