System Headroom turns a noisy process list into a clear answer: which apps are actually using your Mac's CPU, memory, and network ports. Open the menu bar and see your top 10 CPU consumers, your top 10 memory consumers, and every local listening port, sorted and readable in seconds. No more scrolling through a list of cryptic helper processes trying to figure out which app they belong to. GROUPED BY APP, NOT BY PROCESS Fourteen Chrome processes show up as one Chrome row, with a combined total and a process count. Tap to expand and see the individual helpers when you want the detail. Every app on the list collapses the same way, so the answer is always the app, not the process noise underneath it. SEE WHAT'S LISTENING The Ports tab lists every TCP and UDP port your Mac is listening on, grouped by the app that owns it. Port numbers sit right on the row, so "which app is using port 3000" takes one glance instead of a trip to Terminal. A small tag marks system services, so your own apps stand out from the built-in ones. BUILT FOR A GLANCE - Top 10 CPU and top 10 memory consumers, updated automatically - Every local listening port, grouped by the owning app - Refresh interval you control: 2, 5, 10, or 30 seconds - A built-in glossary explains cryptic system processes like corespotlightd in plain language - Light and dark mode, with a calm, native design that fits right into macOS - Sampling pauses while the popover is closed, so the app stays out of your way PRIVATE BY DESIGN System Headroom reads what it needs from your Mac and shows you the answer. Nothing leaves your machine. No account, no analytics, no network calls, and zero third-party dependencies. Even the Ports tab reads from your Mac's own tables and never touches the network. It runs inside Apple's App Sandbox, the same protection every Mac App Store app gets. ONE-TIME PURCHASE No subscription, no in-app purchases, no ads. Buy it once and it's yours. Requires macOS 14 or later. Questions or feature requests? Use the support link on this page.
Utilities · iPhone, iPad · $4.99
