API Fortress is an API testing suite as a platform. A versatile toolbox for any company that relies on APIs. Create functional tests, virtualize APIs, and perform load tests. API Fortress is an API testing suite as a platform. A versatile toolbox for any company that relies on APIs. Create and automate functional tests, virtualize APIs, and perform load tests. Save time with automated test generation, collaborate with an intuitive interface, and validate deployments to catch problems before your customers or partners. To learn more about why companies are switching to visit the API Fortress homepage.