Having recently updated my third generation iPad to iOS 7, it was with some trepidation that I launched the legacy version (1.1) of RatioKey, which hasn't seen an update for three years, but remains on the app store (last I checked).
Eureka! It ran perfectly, perhaps even better than under iOS 6.1.
So I'll be retargeting the update I'm currently working on for iOS 7.
