The API client that stays out of your way.

restless is offline-first and open source. No account, no telemetry, and your data stays on your machine.

Free. Apache-2.0. Windows, macOS and Linux.

Everything local. Nothing to sign in to.

Every core feature works with no cloud and no account.

The only network calls are the ones you ask for, plus an update check you can turn on.

Open any folder and keep collections as YAML, with commits, branches and history. No remote needed.

Environments, request chaining, scripts, cookies, and OAuth, AWS IAM, NTLM and more.

An OpenAPI editor with live preview and Spectral linting.

Scripts, test suites and a collection runner, in the app or in CI with rl.

Create mock routes and serve them from a mock server you host.

Optional AI, MCP, secret managers and Git sign-in stay off until you enable them, using your own keys.

Extend it with plugins and themes. Supports Insomnia's plugins and themes.

Imports Insomnia, Postman, OpenAPI, HAR and cURL. Your Insomnia YAML works as it is.

All four cover the core protocols. The difference is in what comes after.

	restless	Postman	Insomnia	Bruno
REST, GraphQL, gRPC, WebSockets	Yes	Yes	Yes	Yes
Every feature free	Yes	Paid plans	Paid plans	Paid editions
Offline first	Yes	Cloud-based	Optional	Yes
No telemetry	Yes	No opt-out found	Always on with an account	On by default, can be turned off
No account needed	Yes	Limited client only	Scratch Pad only	Yes
Open source	Apache-2.0	No	Apache-2.0	MIT, paid parts are proprietary
Files in Git	Yes	Yes	Free for up to 3 users	Yes
Insomnia plugins and themes	Yes	No	Yes	No
Free secret managers	Yes	Enterprise add-on	Enterprise plan	Ultimate plan

Windows and macOS builds aren't signed yet, so you may see a warning on first launch.

# Run your collections in CI with the rl command
$ rl run collection -w ./api.yaml --ci -e staging