Subtle One-Click Timer
A simple (and subtle) one-click timer.
Just click 10, 30 or 60 minutes and it will notify you when it has completed. You can then close the notification or press a button to repeat the timer for the same period.
No extra settings or bells or whistles. It runs in the background and a notification will appear on screen when it is done. (Don't forget to allow notifications on Chrome and your computer.)
If you are using your computer already, why pull out your phone to set a timer?