Key Mapper

Flexible key remapping for hardware buttons and Bluetooth gear

Key Mapper from sds100 is a focused utility that lets you redefine what your device’s physical keys do. Instead of treating volume or other hardware buttons as single-purpose controls, you can turn them into shortcuts for frequent tasks, creating a faster path to the actions you use most.

The app supports a wide range of outputs. You can assign a button to open an app, trigger a shortcut, paste preset text, or simulate on-screen taps and gestures. A standout feature is its Triggers system, which combines multiple button presses into one instruction. That means you can stack inputs to expand what each key can accomplish, all without touching the display.

Key Mapper does not confine itself to built-in keys. It recognizes external hardware connected over Bluetooth, including keyboards, so your add-on buttons can be pressed into service for the same actions. This broadens its appeal for anyone who prefers physical controls or works with accessories and wants consistent behavior across them.

There are important limits to note. The tool only deals with physical buttons, so on-screen navigation areas are off the table. Also, certain advanced actions need root access to function, which narrows the feature set if you are not using a rooted device. Within those boundaries, the interface feels approachable and the logic of setting up mappings is clear, so experimenting with different layouts is straightforward.

If you want more control over how your hardware keys behave, Key Mapper delivers a practical feature set with thoughtful extras like gesture simulation and multi-press Triggers. Its support for Bluetooth peripherals adds versatility, while the physical-only scope and occasional root requirement are the main trade-offs to consider.