The Lichess app has had a built in clock that works very well and has all the time settings you would want. You can find it in the menu under the analysis board

The Lichess app has had a built in clock that works very well and has all the time settings you would want. You can find it in the menu under the analysis board. I think a lot of people don't know that it's included even if they use Lichess. Been using that for at least five years when I need a phone based chess clock on the go. I didn't try yours, but it has all the options for stuff like increments, handicap, stages, etc.