Health ring at a glance
Maximum capacity divided by design capacity, shown as a green, orange or red ring with charging, adapter or battery status.
Open source · macOS 14+ · Universal binary · Battery & Power
Know your battery's
real health
See your Mac battery's cycle count, true capacity and wear from the menu bar. Click the icon for a popover with a health ring, live stats and a daily history chart.
Free & MIT licensed · Apple Silicon & Intel · Latest release
Features
Everything your battery reports.
BatteryHealthLens reads the data macOS already exposes and keeps it on your Mac.
Nine detailed stat tiles
Cycle count, design and full-charge capacity, current charge in mAh, temperature, voltage, amperage, adapter connection and wattage. Missing values show a dash.
Daily health history
One snapshot per day feeds a chart with 1M, 6M and All ranges, so you can watch wear develop over months.
Optional threshold alerts
Get a local notification when health falls below a level you choose or the cycle count reaches your target. Each alert fires once per crossing.
Copy a plain-text report
One click puts the current readings on the clipboard, handy for support tickets or resale listings.
Settings that stay simple
Show or hide the menu bar percentage, switch between Celsius and Fahrenheit, set alert thresholds and launch at login.
Screenshots
See it in action.
Install
Up and running in a minute.
BatteryHealthLens is open source and not notarized with a paid Apple Developer ID, so macOS needs one extra step the first time.
- Download BatteryHealthLens-macOS.zip and unzip it.
- Move BatteryHealthLens.app to your Applications folder.
- Clear the quarantine flag once, then right-click the app and choose Open:
xattr -cr /Applications/BatteryHealthLens.app
- No special permissions are required macOS asks for notification access only if you turn on alerts, and Launch at login appears under System Settings General Login Items.
Download
Get BatteryHealthLens for macOS
Free, forever. Built for macOS 14 Sonoma or newer, Apple Silicon and Intel.
Not notarized: on first launch right-click BatteryHealthLens.app → Open.
- macOS 14 Sonoma+
- Universal (Apple Silicon + Intel)
- MIT licensed · open source
- No ads, no accounts, no telemetry
- Built with Claude Code · how and why
FAQ
Questions, answered.
Is BatteryHealthLens free and open source?
Yes. It is free to use and released under the MIT license, with the full source on GitHub. There are no accounts, no ads and no paid tier if it is useful, an optional Ko-fi donation button is available.
What permissions does it need?
None for reading battery data, since the AppleSmartBattery registry entry is readable by any user. It asks for notification access only when you enable alerts, and shows up in Login Items only if you enable Launch at login.
Where is my data stored?
Only on your Mac. The daily history is a small JSON file at ~/Library/Application Support/BatteryHealthLens/history.json, limited to five years. The app makes no network calls and has no analytics.
Why isn't the app notarized?
Notarization requires a paid Apple Developer account, and this is a free project. Right-click the app and choose Open once to get past Gatekeeper, or build it yourself from source with Xcode and XcodeGen.
Was this written by AI?
Yes. BatteryHealthLens was generated by Claude Code from a written spec as a clean-room reimplementation, with no code or assets from any commercial app. The full source is on GitHub under MIT, so you can read every line before you run it. It has had less human review than a hand-written app, so bug reports are welcome.
Support ❤️
Built by one person, given away for free.
BatteryHealthLens is a free, open-source alternative to paid utilities. If it earns a spot on your Mac, a coffee keeps the updates coming.
☕ Support Or on Ko-fi