Network Monitor is a free, on-device macOS menu-bar network monitor. See, second by second, which apps are using your bandwidth — with per-app live up/down speed, history, and a remote-endpoint breakdown. No accounts, no telemetry, zero outbound connections.
Features
- Live up/down speed in the menu bar, refreshed every second.
- One unified list of every app, sorted by lifetime usage, with a live activity dot, code-signature trust, and a System/User tag. Chrome/Electron helper processes collapse into one row.
- Per-app charts in a floating panel — Live / 5 min / 15 min / 1 hour / 24 hours — with a trading-style hover crosshair and a per-port · service · remote-IP breakdown. Pin up to three to compare apps live.
- Search across app names, PIDs, ports, and services — just start typing.
- Cross-session lifetime totals, with one-click reset.
- End a runaway process straight from its row — graceful quit for GUI apps,
SIGTERM→SIGKILLfor background ones; system processes are never offered the action. - Private by design — everything computed on-device, a 24-hour history cap, and no socket of its own (a CI gate fails the build if any outbound-connection API appears in the shipped sources).
Install
Homebrew
brew install --cask light-house-group/taps/network-monitor
Direct download — grab NetworkUsageMonitor-1.0.0.dmg below, open it, and drag the app into Applications. Developer-ID signed, Apple-notarized, and stapled — no Gatekeeper warning.
Requires macOS 13 (Ventura) or later · Apple Silicon or Intel.
shasum -a 256 · c02c14ebaebff240a05df30423ca6ff49e58270e4fa469dfa70a153f718c82e9