Macometer
4
$7.99

Look for a small moving line with a percentage beside it.

That is how the app introduces itself on first launch. Macometer lives in the menu bar and the window is optional. Click the item and you get the verdict, four readings and the top apps, without opening anything else.

Firefox has used most of your CPU for 8 minutes.
51% of your Mac's CPU, about 3 times its usual. The CPU is at 69°C.
Also: 2 agents are waiting for you, 1 dev server is idle

Simulated data, not your Mac.

Simulated data, running in your browser.

One item, or several.

The Summary shows CPU. You can add separate items for CPU, Memory, GPU, Network, Temperature, Power and Battery, each as a value, a graph or both.

It speaks up when something is high.

When a reading crosses into trouble, the Summary swaps to it, such as "MEM 94%", and goes back when it clears.

Alerts are off until you want them.

You can get a notification for CPU, memory pressure, temperature and more. Thresholds and how long they must hold are yours. macOS asks for permission when you turn the first one on.

Light enough to leave running.

With the window closed, the engine measured 0.40 to 0.46% of one core, and 0.47 to 0.53% with the Agents item on. The budget is 0.3%, so this is a known issue we want lower.

$7.99 for the first 25, then $14.99, once. No subscription.