Features

Everything in API Circle

A complete API client, rebuilt around two ideas the others miss: your workspace is a Git repo, and your workspace is an AI tool catalog.

Your collections are plain JSON in your own repo — branch, diff, review, merge.

A built-in MCP server exposes 94 tools so any AI client can read, author, and run requests.

Point at an OpenAPI, Swagger, Postman, or Insomnia file and get a running mock on localhost.

Bearer to AWS SigV4 to the full OAuth2 grant set — verified against the relevant RFCs.

Run collections, spin up mocks, and import specs from any terminal — no UI required.

Nine sidebar views and YAML request editing — no webview, no separate sync.

A complete request toolkit

And all the essentials, done right

The day-to-day capabilities you expect from a serious API client — none of them an afterthought.

cURL, OpenAPI/Swagger, Postman, Insomnia, HAR, and portable .apicircle.json — 6 formats.

Turn any saved request into cURL, fetch, Node (axios), Python, Go, or Rust.

Priority ordering and cross-workspace variable sources, with encrypted secret rows.

Status, header, body, JSON-path, and duration checks on every response.

Chain requests into multi-step plans, run them with assertions, and replay from history.

Reusable JSON Schemas, GraphQL definitions, and file assets tracked alongside the repo.

Full headers, body previews, and assertion results for every run — per device.

AES-GCM encryption, OS-keychain wrapping on desktop, passphrase model on web.

Open the web app in your browser, or grab the desktop build. No account, no setup — your first workspace is created the moment you arrive.