Every MacBook comes with build-in support for a setting called low and automatic power mode, select MacBook's also support high power mode. Normally you have to change these from the system settings, the PowerMode app gives you an easier way to switch between these energy modes.

The app also gives you the option to automatically enable low power mode on low battery.

The app supports macOS 26.0 and newer.

All MacBooks running macOS 26.0 or later are supported. Note that only MacBook's are supported. Mac desktops are not supported as they do not support energy modes.

When enabled, this feature will automatically enable low power mode when the battery level falls below 20%. It will be reset to the original energy mode when connecting to a power source or can be cancelled until sufficiently charged by manually selecting another energy mode.

Currently, the only programmatic interface to change the energy mode is the pmset terminal command.

The pmset interface is designed such that it requires privileges to make any changes to the energy mode. As there are currently no alternatives to this, a helper tool had to be created which, when installed and approved by the user, can use the pmset interface.

When developing this helper tool, the latest security protocols were used. This includes verifying the connection using modern API's and using enabling sandboxing which restricts the helper tool such that it can only make changes to preference files actually used by pmset.