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Bosun.dev
See what's exposed. The macOS menu bar app that shows every open port, tunnel, VPN, and container โ before it's a problem.
Bosun is a native macOS menu bar app that shows you everything your Mac has open to the network, right when you need it, with no Terminal digging required.
It runs lsof in the background to list every listening port, then goes further than a simple port scanner: it maps each port to the process actually holding it, and adds context most tools miss.
What it shows you:
- Every listening port, grouped by process, with PID, binary path, and working directory
- Active ngrok and Cloudflare tunnels (named + quick), with the public URL inline
- Native macOS VPN connection status
- Docker containers, mapped by container name and image instead of a generic docker-proxy PID
- SSH -L port forwards, parsed automatically
- Per-process CPU, memory, and uptime on demand
- Persistent port history with configurable retention
What it lets you do:
- Kill any process with one click (graceful SIGTERM, SIGKILL fallback if it lingers)
- Kill All with confirmation, for clearing out a cluttered dev environment fast
- Copy localhost:PORT or open it in the browser instantly
- Toggle everything from a configurable global hotkey
Bosun is built for developers running local dev servers, Docker containers, and tunnels day to day, who need to know instantly what's bound to which port, what's exposing their machine to the network, and what's safe to kill.
Pure Swift, no Electron, no third-party dependencies beyond Sparkle for auto-updates. One-time purchase, 14-day free trial, no subscription.
- Paid
- Free Trial
- $12.99 / One-off (Solo, 1 computer)
- Official Pricing
