Lots of the bad reviews are because people think it auto tracks where you are in the chest rotation you are. This is not the case.
I suggest maybe putting in a tutorial if this gets updated.
Also it would be awesome if it were to explain the amount of hours needed until you reach your next chest.
Other than that, a really good clash royale companion.
Some guy in Toronto about Chest Tracker for Clash Royale - Easy Rotation Calculator, v1.3