Home

Live network speed in your Mac's menu bar, and which apps used your data.

Download · Website · Source

The README is the short version. These pages are the long one: how every feature works, and why it was built that way.

Using NetworkMonitor

Page	What's in it
Installing, updating and removing	Every step, how it updates itself, and what uninstalling puts back
Features	The menu bar readout, the popover, per-connection totals, Settings
Connections	Which companies, countries and servers your apps talk to, and what the names mean
Usage History	Looking back by day, week, month or year; sessions; CSV export
Speed test	What it measures, how it shows, and what it costs in data
Hotspot mode	What counts as a hotspot, what it pauses, the helper, Low Data Mode
Accuracy and battery	What the numbers mean, why rows don't add up exactly, and what it costs to run
Privacy	What it reads, sends and stores
Security policy	Reporting a vulnerability, what's in scope, checking a download

Working on NetworkMonitor

Page	What's in it
Architecture	How data flows (with a diagram), threads, the two measurement sources, files
Building, testing and releasing	Make targets, signing and notarizing, the test harness, CI, launch arguments, the release and website workflow
Decisions	Principles, a dated decision log, and approaches that were turned down
Roadmap and known limits	What the Developer ID made possible, and what's done; ideas; known limits

Start with Architecture and Decisions before changing how anything is measured.