Testfully is a cloud-based platform for API development, testing, and monitoring. It allows users to define API requests and test scenarios (including multi-step workflows), either manually or via scripts, and supports automated background checks. The platform provides tools for collaboration (sharing requests, workspaces, versions), secret management (for credentials), and integration options such as a CLI for use in CI/CD pipelines. It also supports alerting via various channels when monitored APIs fail health or performance checks.