Heads up: in an upcoming release, DevTools Studio becomes Stresseur Studio. It's the same app with the same flows, and it's still free, open source and local. You don't need to do anything. Read the announcement

DevTools Studio

Local‑first API client and flow builder. Import HAR, build visual flows, export YAML, and run in CI.

Studio

Auto‑selects the right binary for your OS and architecture.

Download Studio

Apple Silicon and Intel on macOS. x64 on Windows and Linux.

CLI

Run YAML flows in CI with JUnit/JSON outputs and proper exit codes.

curl -fsSL https://sh.dev.tools/install.sh | bash

See the CLI reference.

DevTools Studio with a checkout flow open

A recorded checkout flow in Studio.

Install steps

macOS: If Gatekeeper prompts, allow from identified developer in System Settings → Privacy & Security.
Windows: Installer is signed; run as administrator if required.
Linux: Make AppImage executable (chmod +x), or use .deb/.rpm if preferred.

FAQ

Is it free?

Yes. DevTools Studio and the DevTools CLI are open source under the Apache-2.0 license. View on GitHub.

Does it run offline?

Yes. DevTools is local‑first and does not require an account.

What’s the difference vs CLI?

Studio is the desktop app for building flows; the CLI runs exported YAML flows in CI with JUnit/JSON outputs.