API Circle Studio is an API workspace for developers who want API collections to live closer to code.
Instead of locking requests inside a cloud-only tool, API Circle keeps your workspace as readable JSON that can be synced through Git. Teams can review API changes through branches, diffs, and pull requests.
It also ships with local mock servers, 17 auth schemes, request execution, environments, assertions, CLI support, desktop/web apps, and MCP integration so AI clients can read, author, and run requests from the same workspace.
Built for developers who want API development to feel more like software development.
