InterceptorHTTPS decryption
Generate a root CA, install it on the clients you want to inspect, and read HTTP/1, HTTP/2 and WebSocket traffic in plain text.
HTTP(S) debugging proxy
See every request.
Change any response.
Interceptor captures and decrypts traffic from your browser, desktop apps, simulators and phones. Inspect it, pause it, mock it and replay it, without touching your code.
Everything you need to debug the network
Built on mitmproxy's battle-tested engine, with a fast inspector on top.
Live inspector
Flow list, domain sidebar, filters, headers, highlighted JSON, image, HTML, font and protobuf previews. Copy as cURL, fetch, Python, Kotlin or Swift.
Breakpoints
Pause matching requests or responses, edit method, URL, headers, status and body, then execute or abort.
Mock & map
Return fake responses with custom status and delay, serve a local file, or redirect a request to another host.
Mock assistant
Describe a mock in plain words. It builds the rule from your captured traffic.
Replay & edit
Re-send any captured request as-is, or tweak it first. Replays skip your rules so they reach the real server.
Network presets
Simulate Wi-Fi, 4G, 3G, Edge, packet loss or fully offline to see how your app copes.
Per-app filtering
Filter by desktop process or client device so you only see the traffic you care about.
MCP server
Let AI assistants list and search flows, replay requests and manage rules through the built-in interceptor-mcp server.
Up and running in three steps
- InstallDownload for your platform and open Interceptor. The proxy starts on port 8080.
- ConnectUse Setup → Connect a device to launch a wired-up browser or configure Android, iOS or a real device.
- InspectInstall the CA once, then watch traffic arrive. Right-click any request to break, mock or replay.
Download Interceptor
Choose your platform.
Not sure which Mac? Apple menu → About This Mac. “Chip: Apple M…” means Apple silicon; “Processor: Intel…” means Intel.
FAQ
Do I have to install a certificate?
To read HTTPS traffic, yes: Interceptor generates its own root CA and you install it on each client you want to inspect. The Connect a device wizard guides you, or open mitm.it from a device already using the proxy.
macOS says the app can’t be opened or verified.
Open the downloaded app with right-click → Open the first time, or go to System Settings → Privacy & Security and choose Open Anyway.
Can I use it with iOS simulators and Android emulators?
Yes. The Connect a device dialog has tabs for Web, Android, iOS, real devices and other clients, with one-click helpers where possible.
Where is my data stored?
Captured traffic stays on your computer. Rules are saved locally in ~/.interceptor/rules.json.