This app is one of those targetted applications that does a single, particular task, and it does it well.The interface is bare-bones, but that's a generally good thing for utilities. It is a bit odd, though, which is why I didn't give it five stars. To close the app, one has to click on a power symbol in the lower left of the interface. There are no window controls or menubar, which may make sense, given that the only setting for the app is "Open at login." It's just awkward to find.

This is the fastest, simplest way to accomplish something I have to do several times per week.I would rate it as a 5-star app if not for one problem it has caused. It includes two shortcuts and does not provide a way to customize them or turn them off. Control-O is reserved for opening an image and Control-C is used to select portions of the screen. I already had Control-O and Control-C set for other universal shortcuts on my Mac. Changing those is a pain because they are part of a large set of customized Control- shortcuts. I either need to change my shortcuts or only run Aspect Ratio Calculator when I need it; yet, it’s the kind of app that is most useful if it’s always available. Although I use shortcuts a lot, I’d prefer to use the menu for these two functions in Aspect Ratio Calculator.

This app saves me so much time calcualting propotions, scales, etc. I look at others and this app was the most refined looking and UX. It allows you to increase one dimension X or Y and having continous updates to the other variables, such as the X or Y, ratio, scale, etc.

Tried on Mac-mini with 10.9.5 and can’t lanch this app:7/16/15 4:02:39.283 PM Aspect Ratio Calculator[49696]: Invalid color System, labelColor (warning given only once)7/16/15 4:02:39.505 PM WindowServer[143]: CGXSetWindowListSystemAlpha: Invalid window 7940 (index 0/1)7/16/15 4:02:41.611 PM com.apple.launchd.peruser.501[365]: (com.bridgetech.aspect-ratio-calculator.87680[49696]) Job appears to have crashed: Segmentation fault: 11