Karabiner Elements

Karabiner Elements is a utility for macOS that enables advanced key remapping, keyboard event modification, and the creation of complex configuration profiles. The program operates at the system level, offering detailed control over the behavior of input hardware.

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• Simple Key Remapping. This function allows changing the output of a physical key to another. A user can configure the Caps Lock key to act as the Escape or Control key. This modification is global and affects all applications on the system. The configuration is applied through rules defined in the preferences interface.
• Application-Specific Remapping. This function executes specific key remappings only when a particular application is active. It is possible to have a key combination behave one way in a web browser and differently in a code editor. The rule is defined by specifying the bundle identifier of the target application.
• Complex Modifications. This function enables the creation of multi-layered and conditional remapping rules. It allows defining actions such as turning a single key press into a combination, or activating a profile by holding down a key. Rules are built with conditions and multiple layers of event transformation.
• Device Profiles. This function associates specific configurations with particular input devices by identifying them via vendor_id and product_id. An external keyboard can have a different set of rules than the laptop's built-in keyboard. The profile switching is automatic when connecting or disconnecting the device.
• Function Key Modification (F1-F12). This function controls the behavior of the function key row. It allows choosing between the standard behavior of F1-F12 keys or the media keys (brightness, volume, etc.) without needing to press the Fn key. The setting can be applied globally or per device.
• International Keyboard Simulation. This function emulates the layout of keyboards from different regions by remapping key positions. It facilitates typing special characters or accents without changing the operating system's layout. This is achieved by mapping dead keys or specific combinations.
• EventViewer. This tool displays keyboard events generated by the hardware in real-time and their transformation after applying rules. It serves to debug complex configurations, verifying the key codes and modifier flags that the system ultimately receives.
• Keyboard Parameter Modification. This function adjusts system parameters like Key Repeat speed, Delay Until Repeat, and cursor blink rate. These adjustments are more granular than those offered in macOS System Preferences.
• Virtual Key Creation. This function allows defining keys that do not physically exist on the keyboard, such as Hyper (⌃⌥⇧⌘) or Meh (⌃⌥⇧). These virtual keys can be used as modifiers in other rules to trigger actions without conflicts with existing application shortcuts.
• JSON-Based Rules. All program configuration is stored in files using the JSON format. Advanced users can edit these files manually to create rules that are not possible through the graphical interface. This structure allows copying, versioning, and sharing complex configurations.
• Observation Mode (Karabiner-EventViewer). A separate component that captures and logs all incoming keyboard and mouse events. It provides raw data such as key codes, pointer coordinates, and modifier states. It is used to understand the event flow before designing rules.
• Selective Key Disabling. This function allows completely disabling the output of a specific key. A damaged or unwanted physical key (like the Windows Command key on a PC keyboard) can be deactivated to prevent accidental presses. The key then ceases to generate any event in the system.

The development of Karabiner Elements began in 2016 as a complete rewrite of the original Karabiner tool (formerly KeyRemap4MacBook). The project was created and is maintained by Takayama Fumihiko. The original version, KeyRemap4MacBook, was started around 2008. The program is written primarily in the C++ programming language, with system components and device drivers. The new architecture of Karabiner Elements was designed to be compatible with the security restrictions and APIs of macOS versions after 10.12 Sierra.

Alternatives to Karabiner Elements:

Bettermouse

Bettermouse is a utility application for macOS that provides smooth mouse scrolling, precise cursor speed control, and configurable links between mouse buttons and the keyboard.

Price: Free   Size: 5.2 MB   Version: 1.6.8568   OS: MacOS