The Shared Game Timer is the worlds most powerful and over-engineered board game timer. I have no doubt that this is true.
A board game timer is sort of like a chess clock, but for any number of people playing all kind of complex modern board games.
Other similar apps all suffer from the problem that they run on a single phone, which has to be passed around the table, which is really annoying and often distract from the game more than the time savings are worth.
The Shared Game Timer solves this issue in two ways. First is that it can run on multiple phones, all kept in sync. So each player can have a device within reach. The second is that it can be connected up to physical remote control buttons. When playing analog games, pressing a physical button simply feels better than pressing a screen. Things like Text-To-Speech and easy-to-see presentation modes make you able to move the phone off-table and yet help kick players out of Analysis Paralysis.
The Shared Game Timer has a crazy amount of features. To see them all, please see the features page.