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by vthommeret 1995 days ago
I built a similar tool to the OP that implements the same rounding behavior if you’re in the iOS ecosystem — https://apps.apple.com/us/app/synctimer-by-practice/id152297...

One of the main benefits is that it doesn’t require the internet and can synchronize iPhones, iPads, and Apple TV’s using either peer-to-peer WiFi or Bluetooth with no manual pairing.

Also had an interval timer for exercises, group activities, etc...