Install latest/stable of Kronometer
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Kronometer is a stopwatch application. It features the basic stopwatch actions (pause/resume/reset/laps), as well as the ability to save the times and resume them later. Kronometer is part of the KDE Extragear collection, within the Utils sub-module.
Features:
Generate an embeddable card to be shared on external websites.
Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.