Date Time Counter lets you count date and time for your important events on your computer.
Finito lets you use your wallpaper as a countdown timer for your tasks on Mac.
Countdowns helps you add and view countdowns to your events in your menu bar.
Hurry enables you to add various kinds of countdowns as widgets to your Android home-screen.
Want a simple and customizable countdown in your browser? TikTok is the one you should go for.