Chess Clock app on World Chess

You can't set the clock for a base time of more than 90 minutes.
It doesn't support delay time controls or time controls with more than one time period.
It doesn't give the increment time for move one like it's suppose to under FIDE rules. (For example, for 3+2, each player starts with 3:02 at the start of move one under FIDE (and US Chess) rules. The app only gives each player 3:00 at the start of move one.)
It doesn't appear there is anyway to adjust the time in the middle of a game in case the time needs to be adjusted for a penalty.
The clock could accidentally be reset if the "<<" button is pressed during a game.
It would also be nice if there was an option to see tenths of a second when you get low on time.

No one would be using their phone as a clock in a fide tournament, so I'm not sure how compliance such as that is relevant.
There is a new clock app that looks quite good on World Chess
https://worldchess.com/news/the-last-chess-clock-youll-ever-need-and-its-free
Looks like iPhone only, which is disappointing.