Simply the best
Been using this and its Android variant since it came out (about a decade?) It's simple to use and works exactly as you'd expect. I love the data visualization, PR tracking, automatic timer, and data export functionality too. Can't recommend this app enough. Small nits for the dev: I'd love records for purely rep or time-based exercises. Also there's a minor bug where the audio un-dimming signal can get interrupted if you save a new set while the audio is dimmed.