Scalemate is the easiest and simplest way to mass resize images.
Beta 1 is available now, tap the big blue Download button to install.
Memory leaks are quite bad
Hovering over images causes a massive spike in memory usage
Dropping images in and saving them freezes the UI
Trying to save .PSDs or certain other image formats will cause the app to close
THINGS TO CHANGE
Make the UI more responsive during heavy operations
Decrease memory usage
This was my 4000th post, yay.