Free Alternative to BetterTouchTool

Karabiner-Elements 16.1.0 (July 2026) is the definitive free keyboard customizer for macOS, with builds that track new OS trains including Tahoe-class releases. Simple Modifications handle key swaps. Complex Modifications cover dual-function keys, layers, device-specific profiles and app-aware rules via JSON or the community rules library. It is open source, widely trusted, and often more capable than BTT for pure keyboard work. It does not replace trackpad gestures, Touch Bar layouts or BTT's visual gesture editor. Pair it with Rectangle for window management if that is all you needed from BTT. Practical notes: install with brew install --cask karabiner-elements, then start with Simple Modifications for Caps Lock to Escape or Control. Move to Complex Modifications and the community rules library when you need dual-role keys, layers or app-aware rules. Export JSON backups of working configs. On new macOS versions, Karabiner's release cadence is a major reason people trust it as a free daily driver. For Hyperkey setups (Caps Lock as Command+Control+Option+Shift), Karabiner is the usual free recipe and often cleaner than rebuilding the same idea inside BTT.

Many people buy BetterTouchTool mainly to snap windows with gestures or shortcuts. Rectangle does the snapping part for free with keyboard shortcuts and menu actions. It is actively maintained, light and available on Homebrew. It will not read multi-finger trackpad draws the way BTT does, but combined with Karabiner hyperkeys it covers a huge slice of productivity setups without $15-$25. Rectangle Pro is paid if you want more, but the free app is enough for classic halves, thirds and corners. Practical notes: rebind snap actions to hyperkeys created in Karabiner and you may never miss BTT window gestures. Install with brew install --cask rectangle. If your BTT config is 80% snap gestures and 20% keys, Rectangle plus Karabiner is the free stack to try before you pay.

Hammerspoon is a free automation bridge that can bind keys, react to events, move windows and call system APIs through Lua. In skilled hands it can recreate pieces of BTT and more. In unskilled hands it is a blank editor with outage potential. Maintenance is slower than Karabiner's rapid OS-tracking releases, so verify compatibility on your macOS version. Hammerspoon is free automation for people willing to maintain scripts instead of a gesture GUI. Start from known spoons, keep config in Git, and do not use it as your first free BTT alternative unless you already write Lua. For most free-alternative searches, Karabiner plus Rectangle should come first; Hammerspoon is the third layer when you need custom event logic.