Version History

• •A newly connected keyboard could fail to switch input sources until Settings was opened.

Added

• •Each ⌘ and ⌥ key that switches input sources can now switch the instant it is pressed, instead of when it is released. Choose it per key under Settings › Remapping › Switches. A key set this way stops working as a modifier and no other app sees the press, so keep the release option for keys whose shortcuts you use.
• •Caps Lock can now jump to one specific input source, or switch through Keystone instead of the system shortcut, the same way the ⌘ and ⌥ keys can.

Changed

• •Settings › Remapping now has one section per key, with only the controls that key's choice calls for.
• •The menu bar toggle now turns all remapping on and off, not only Caps Lock.

Fixed

• •The Settings window could no longer be dragged after a switch in it was flipped.

• •The app icon's background looked flat in the Dock and Finder. It now shows its gradient.

• •Closing Settings or the welcome window now returns you to the app you were using, so other apps' shortcuts keep working right away.

• •Fixed steady processor use that began once Settings had been opened and went on after the window was closed.

• •1.5.0 crashed on launch: the release toolchain generates a stricter localization-bundle lookup than the one the app was tested against, and it never checked Contents/Resources. The bundle is now resolved explicitly, so the lookup works regardless of the toolchain that built the app.

• •Hold for real Caps Lock (Settings › Remapping, off by default): hold the remapped key for about half a second to toggle actual Caps Lock, uppercase, keyboard LED and all, just like the key used to. Quick taps keep switching the input source the instant you press, and once Caps Lock is engaged only another hold turns it off. Needs the Input Monitoring permission.
• •The app now speaks Korean. Menus, Settings, and onboarding follow the macOS language, with English everywhere else.

Added

• •Each tap key can now jump to a specific input source instead of cycling. Pick any enabled source per key in Settings, e.g. left ⌘ for ABC and right ⌘ for 2-Set Korean. Existing tap settings carry over as "Next input source".

Changed

• •Settings redesigned in the system's grouped style, with section headers, rounded boxes, and switches like Xcode's settings.

Added

• •Tap a ⌘ or ⌥ key on its own to switch the input source. Choose left, right, or both sides of each in Settings. Every shortcut using the key keeps working, since a lone press-and-release is the whole gesture.
• •Watching for that tap is the one Keystone feature that observes keys, so it asks for the Input Monitoring permission, and only once it's turned on.

Fixed

• •Settings panes now scroll when their content is taller than the window.

• •Spotlight now finds the app by its Korean name and by what it does: 키스톤, 한영 전환, 한영키, 캡스락, and caps lock all match.

• •Settings is now two panes: the Caps Lock toggle, destination key, and the Keyboard Settings shortcut moved to their own Remapping pane in the sidebar, leaving General to launch-at-login, the menu bar icon, and updates.
• •The version and build number under Check for Updates now show in development builds too (as "Version dev").

Added

• •The menu bar icon can be hidden (Settings › General). While hidden, launching Keystone again opens Settings, and the app appears in the Dock only while the Settings window is open, the same arrangement as its siblings.

Fixed

• •⌘W, ⌘Q, and ⌘, now work in the Settings window: the accessory app was missing the main menu that dispatches key equivalents.

• •The icon's arch now declares a blur material like its siblings, keeping the frosted-glass treatment consistent across appearances.

• •The dark-mode icon lost its glass entirely. The previous fix dimmed the arch image instead of declaring materials. The icon document now declares real Liquid Glass (specular highlights and a translucent frosted arch under the solid keystone), so every appearance keeps the glassy look.

• •The dark-mode app icon rendered the arch as a near-opaque slab; it now carries the suite's translucent-glass alpha and reads as frosted glass against the dark fill.

• •Raised the icon's arch: the keystone's narrow protrusion doesn't read as the glyph's top edge, so the ring itself is now what sits optically centered.

• •New brand color: terracotta, the fired brick of the Roman arches that gave the keystone its job, replacing the amber that sat too close to its sibling Transom.
• •The icon's arch is now optically centered, its voussoir seams cut the flanks into equal stones, and impost seams mark where the arc meets the legs.

• •Quitting Keystone now clears the mapping and returns Caps Lock to stock macOS behavior. The remap is active exactly while the app runs, so what you see in the menu bar is the whole story. Launch at login keeps switching seamless across restarts. (A force-quit can't clean up after itself. The next launch, toggle, or reboot does.)

• •The Caps Lock mapping was installed on every HID service in the system, including the Apple vendor services that translate the keyboard's fn row into brightness/volume events, which silently broke those keys (and apps driven by them, such as Transom) until the mapping was cleared, even after quitting Keystone. The mapping is now scoped to actual keyboard services, and enabling, disabling, or re-asserting the remap first sweeps away the stray mappings older versions left behind.

• •Initial release: Caps Lock rerouted to a spare function key (F19 by default, F13–F20 selectable) inside macOS's HID system, for instant input-source switching with none of Caps Lock's built-in delay, and no process ever touching a keystroke.
• •The mapping is re-asserted automatically after sleep and whenever a keyboard (re)connects, so Bluetooth keyboards can't shake it off.
• •First-run onboarding walks through the one manual step: binding "Select next source in Input menu" to the rerouted key in System Settings.
• •Menu bar toggle, Settings with launch at login and destination-key choice, and Sparkle auto-updates.