Timeboxing

Glad you asked! It helps adapt your agenda on the fly. Let's say a slot is taking slightly longer than expected: with Adaptive Timing, the system will adapt the lenghts of upcoming slots in order to help you still finish on time. Should a slot takes less time than expected, the system builds up some reserve buffer to compensate for slots taking longer.
Channels simplify sharing your timers with - for example - your team. With channels you only have to share a channel link with them. When you start a new timer, you can push it to one (or multiple) channels.

Installation

The Timebox app is a 'Progressive Web App', which means that it can be installed on most devices supporting PWAs.