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It is one app per platform, and each reads Bluetooth the way that system allows — which is why the phone one can separate left, right and case, and the Mac one lives in the menu bar. Since 2.0 the two can talk, if you want them to: neither asks for an account, neither shows an ad, and neither sends anything anywhere until you link one to the other.
It lives in the menu bar, next to the clock: the battery of your headphones, keyboard and mouse in real time, whatever your phone can see right below, and the warning when one of them disconnects with little left.
One-time purchase What the app does on the Mac A home-screen widget with every battery in real time, left, right and case kept apart, an app with a tile for your Wear OS watch, and your Mac on the same list.
Free, with optional Pro What the app does on your phone and watch What comes next
2.0 closed the gap between the two that already exist: they can see each other. The Mac one is on the App Store; the Android one is still waiting on Play. What is missing is a third platform — and support is the way to follow along: I send an e-mail when each version lands.
What the phone reads, showing up on the computer's panel, and the other way around
The same idea on a third platform
Privacy
Nothing leaves your device — except what you send to your own Mac, encrypted end to end.
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BT Battery Notifier