Capture
Inspect requests, responses, timing phases, and matched rules without leaving the desktop.
PostGate
See the request. Change the outcome.
A desktop MITM proxy for frontend engineers who need precise capture, programmable rules, repeatable replay, and browser-level debugging.
Stable channel
Latest release
Checking GitHub for the newest signed macOS build.
From first capture to verified fix.
Capture, rewrite, replay, and debugging stay together in one local workspace.
Rewrite
Redirect hosts, replace files, edit bodies and headers, inject code, simulate latency, throttle bandwidth, or return mocks.
Replay
Save requests in collections, edit them precisely, and run them again.
Debug
Inject a CDP bridge and collect console output, errors, Fetch, and XHR activity.
Stay oriented in real traffic.
Dense request streams remain easy to scan. Status, protocol, timing, and rule matches stay distinct.
Explore captureMethodRequestResultTime
GET/api/cart200POST/checkout201GET/assets/app.jsLOCALGET/profileDEBUG# route the API to a local service
api.example.com host://127.0.0.1:3000
# replace a bundle and enable browser debug
cdn.example.com/app.js file:///project/dist/app.js
example.com debug://Small rules. Immediate outcomes.
Use Whistle-compatible patterns and actions to control upstream routing, requests, responses, local files, timing, browser injection, and plugins.
Read the rules guide