No proxy settings
A Network Extension catches traffic at the system level. Your apps need no proxy configuration.
macOS · HTTP(S) debugging
A bird's-eye view of your network.
A macOS app for inspecting and debugging HTTP(S) traffic. It captures with a Network Extension, so your apps need no proxy settings.
Why Puffin
Built to stay out of your way
You pick the apps
Capture only the apps you choose. Everything else keeps its normal network path, untouched.
Fails open
If Puffin quits or crashes, traffic goes direct. It should never take your network down with it.
Stays on your Mac
No telemetry. Your certificate key is unique to your install and never leaves the machine.
How it works
From your app to your screen
- Your appsOutbound connections from the apps you chose, and from iOS Simulator.
- Network ExtensionDecides which connections to claim and hands them to the app.
- Puffin engineDecrypts listed hosts, parses HTTP/1.1, HTTP/2 and WebSocket, then forwards upstream.
- InspectorEvery request lands in the traffic table, ready to inspect and export.
What you get
Everything you need to see what your app sends
See inside HTTPS
Puffin makes its own certificate authority on your Mac and decrypts only the hosts you list.
HTTP/1.1, HTTP/2, WebSocket
Each HTTP/2 stream is its own transaction. WebSocket messages are assembled and listed with direction and size.
A table that keeps up
A native table built for 100,000+ rows, with a sidebar by app and host, and filters.
A proper inspector
Headers, query, cookies, body, raw, timing and TLS, with JSON, XML, form, image and hex viewers.
Take it with you
Save and reopen sessions, redact secrets, import and export HAR, and copy any request as cURL or code.
Change it on the way
Map Local, Map Remote, Block and Rewrite rules, and breakpoints to pause and edit a request or response.
Find the one that broke
Filter on sizes, timings, headers and bodies, compare two requests side by side, and see a summary per host.
Send it again
Replay a request, edit it first, or build one in the Composer and repeat it as many times as you need.
iOS Simulator
Simulator traffic is labelled by device, and Puffin can install its certificate into booted simulators.