Best GUI for engine vs engine testing for a Mac user

[Meesha]

My engine was developed using Xcode on my Mac. I would like to do some proper testing of new features as well as to gauge its strength. Two questions: what is the best GUI for engine-to-engine matches for a Mac. Secondly, I have been focusing on search, evaluation, pruning etc...and haven't yet implemented time management. So for the moment the only thing I specify at the start of a game is the number of seconds per move, and it doesn't deviate from this. Do most GUI's allow you to specify a fixed number of seconds per move? All I've been able to do is play HIARCs on my iPhone where it has a time control of 15s per move (although it takes longer when it feels like it) and my engine is slightly stronger when set to maximum strength (supposedly 3,100). It doesn't have to be a free GUI, don't care about the cost. Thanks in advance.

[pedrojdm2021]

Cutechess can do that, but sadly they don't provide an Official executable for mac. You have to compile cutechess from source code.

try it:
https://github.com/cutechess/cutechess

[hgm]

There is an XBoard app bundle for Mac.

[Modern Times]

And Banksia, which I think is actually developed on a Mac.