What changed

Updated 21 September 2026 · the current version is 1.4. These are the same notes the app shows in its update window. One source, so the two cannot say different things about the same release.

1.4 21 September 2026

Favourite app. Star one app and it keeps the top row of the Apps list, gets its own menu bar item with the app's icon and its watts, and opens a panel with a verdict on the last hour. The app's page carries the same verdict under the name.
A notification when the favourite stays over a threshold you set, in Settings under Notifications. On battery only, once per spell.
While a phone charges from the Mac the app list says why it is empty instead of printing figures the cable has inflated, and the adapter bar names the phone.
macOS 27: the battery temperature row is back, battery health shows the measured figure again, and the graphics row is measured again.
Fixes: a burst on the first tick after launch is no longer billed as minutes of CPU, app rows no longer repeat "saves N min" under the watts, and the popover's links read on light wallpapers again on macOS 27.

1.3.1 16 September 2026

macOS 27: the quit receipt, the minutes on the header and the battery health page are back. macOS 27 moved the battery's capacity readings to a different place in the system registry, and without them every quit ended in "couldn't isolate the effect" and the health page went blank.
macOS 27: the chip's energy counters can be read but no longer advance on this release, so the app now says so on the Measurements page instead of showing a zero as a measurement. The graphics share and the background remainder are not measured there; per-app watts, the total and the receipt are.
macOS 27 has no battery temperature reading, so that row is gone there rather than showing a wrong number.

1.3 16 September 2026

The menu bar icon shows the charge percentage beside the battery, the same whole number macOS prints, so you can switch the system battery icon off and keep one. Off is a toggle in Settings, under The app.
The battery in the menu bar is drawn on the pixel grid now, with the terminal nub the system icon has: outline, gap and fill match it on every side, and the glyph no longer shifts by a hair when the percentage appears or goes.
The card that says the adapter is a few watts short shows the app's icon, the way the row beneath it already did.

1.2 9 September 2026

Runs read as a journal: grouped by day, each day totalled beside its name, and the rows adding up to the total above them, which they used to miss by eighteen minutes. A run also keeps every app that ran in it instead of the top five.
A receipt credits only the app you quit. Everything that went quiet alongside it used to count, and one exit claimed 203 minutes where the honest answer was 23.
The screens agree with each other now. The header prints the session the journal recorded, a run row says what its minutes were counted over rather than how long the run looked on the clock, and the stats window waits for the new session instead of showing the last one for a few seconds after the cable comes out.
With a device charging from your Mac, the card at the top says so instead of naming an app and promising minutes back. Apps that macOS keeps behind a link, Safari among them, show their own icon again.

1.1 31 August 2026

The night is an hour by hour account: how the charge went, when the cable was in, and what was charging from your Mac while it slept.
Charging has its own page: how fast the charge came back, what the adapter delivered, and whether the Mac slept through part of it.
History is rebuilt around the journal. Every row opens, charges included, a run that cost more than your usual is marked, and period totals name the dearest day and set the period against the one before.
"How WattMate measures" moved inside the app, the "Now" screen is gone, and light and dark can be pinned.
Quitting an app updates the screen at once, windows redraw only when something changed, and percentages stopped jittering.
Build 9, 2 September 2026.
A device charging from your Mac no longer inflates the app numbers, and a run survives the cable being pulled: the session stays whole at the cut, and the charge that left through the cable is named rather than blamed on the apps.
An app you have quit stops counting as running. A shared system service, such as the Open and Save panel, could speak for it and hold the top of the list with a Quit button that had nothing left to close. Quit no longer reaches another app's helpers either.
A session opens: an app goes to its own page, and "Screen and system", "Background work" and "Graphics" go to how we measure. It also says when the split covers less time than the session lasted, instead of leaving you to wonder why the parts do not add up.
An exit we could not measure is written down as that instead of being dropped, a receipt crediting an app with more than it was ever using is refused, and the feed no longer leaves a hole where a hidden run was.

1.0.2 24 August 2026

Buying works. The Buy button pointed at test products, so the checkout it opened could never take money, and a permanent key introduced itself as a subscription that would have locked itself a year later.
The launch price applies on its own: $19 for the first hundred permanent keys, with no code to type.
The card above the app list stops suggesting you quit everything and names the ceiling instead: with all apps closed, this is what the charge gains, usually a reminder that the apps were never the problem.
The list of wireless devices has left the discharge screen. A mouse costs your Mac nothing and cannot be quit. It stays where the charge of a mouse is the whole point: on a Mac with no battery of its own.

1.0 12 August 2026

WattMate shows the power every app on your Mac is using, in watts, and how much longer the charge lasts without it.
Two minutes after you quit something, it measures the Mac again and prints what actually changed, or says plainly that the effect could not be isolated.
It reads the macOS power log to name what woke the Mac while you slept.
Requires an Apple silicon Mac and macOS 14 or later.