Like a StackMat timer, but for Linux.
CubeTimer is a simple app timer for measuring your solve time while playing Rubik's cube puzzle. It can generate scrambled notation for 333 cube and record your last three solves.
CubeTimer is still under review by Flathub team but if you don't want to wait you can install this via test branch,
flatpak install --user https://dl.flathub.org/build-repo/51051/xyz.aguno.CubeTimer.flatpakref
CubeTimer is available at Snapcraft.io and Ubuntu Software.
snap install cubetimer
Press and hold spacebar key, then release to start the timer. Press spacebar again to stop the timer. Repeat.
MIT