What the app does

Updated 23 August 2026 · each page below quotes the wording the app actually shows, taken from its own strings. Who measures this.

Three measurements, and a matching set of sentences for the times a measurement cannot be made. The refusals are the part worth reading: they are what separates a number from a guess wearing a number's clothes.

The three

Watts per app Every app in watts instead of a unitless score, with helper processes folded into one row and system daemons kept out of the ranking. Chrome's forty processes appear once. On a machine without the kernel counter there is no list at all, and the app says so rather than showing zeros. The quit receipt What quitting an app is worth, stated as minutes before you do it, then checked two minutes afterwards against what the machine actually did. Including the answer nobody else prints: the effect could not be isolated, so nothing is claimed. Where the adapter's watts go Delivered, eaten, stored, spare. And when the Mac wants more than the charger gives, the shortfall named in watts next to the app responsible.

What is deliberately missing

No charge limiting. Since macOS 26.4, Apple silicon Macs cap charging natively. A second switch beside Apple's own would be a feature for a feature list rather than for you.

No per-app energy in the App Store edition, and not as a temporary gap: the sandbox forbids asking the system about other processes. The app's own wording is "not 'not yet', but never". That is why the version sold here and the version in the store are not the same product.

No Intel support. The per-process energy counter compiles on Intel and silently returns zero, so the app would ship a number that is always wrong.

No success rate for its own predictions. Publishing "our estimates hold N% of the time" would need a corpus we do not have yet, and the whole point of the receipt is not inventing figures.

Questions people ask

What does it need to run?

macOS 14 or later on Apple silicon. It reads counters the system already exposes, so there is no password prompt and no helper to install.

Does anything leave the Mac?

No. Measurement and storage are local, there is no account, and no per-app data is sent anywhere. The privacy page lists what is stored and where.

How long before it shows numbers?

The app list appears within seconds. The minutes need a run of measurement windows: half the time the first figure arrives within about three minutes, sometimes longer, which is why the app never shows a countdown.

Is there a free version?

A ten-day trial that starts the first time you unplug rather than when you install, because on the charger there is nothing to measure. After that it is $9.99 a year or $29 once.