In the anticipation that RatioKey version 1.1 may no longer work on iOS 7, I've begun work on an update that doesn't make use of deprecated programming techniques. I can't promise to have this done before iOS 7 ships, but I am further along with it than with any past attempt since pushing 1.1 out the door.
This update, which I'm calling version 2.0, will also be free, assuming I get it done and Apple accepts it.
If it turns out that 1.1 does run on iOS 7, I'll probably retarget for that, which will add some time, but may also add functionality.
What's been the holdup? I've been distracted by another strong interest, robotics. For more about that, check out the links on my home page.