I did a web design project in college where I made a combination reminder / clock app based around internet beats. You could mark down when you started working

I did a web design project in college where I made a combination reminder / clock app based around internet beats. You could mark down when you started working on something and then set down reminders for when things needed to happen, in relative minute or best measurements, and you'd get an automatic countdown that would repeat every day, all backed by Firebase so I could share it between my desktop and my phone. It's probably not around anymore, but it was really fun to use for the few weeks where I was using it full time to help keep track of things. I did use a slightly different implementation of beats compared to Swatch's though—I found it more elegant and natural to base the "day" of the beats on the UTC timezone, rather then the GMT+1 timezone that Swatch chose for themselves to represent their headquarters in Switzerland.