When I touch start, it shows the beginning angle, then when I hit stop, it shows the ending angle. Do I have to add the numbers (or subtract) to get the total and turned. This shouldn't be necessary, unless I'm missing something. 'Start' should be set as zero, no matter the original angle, then rotating the phone would show the total and turned, regardless of original orientation. Did I miss something?Ed

I've never rated an app or anything online before but had to take a minute to tell you how invaluable your tool has been for me. I'm 48 and had a total knee replacement 6 weeks ago. I'm fortunate to have a top notch PT team at UCSF to guide me through rehab and, being a numbers person, wanted to buy a plastic goniometer like they use in PT to track my flexion & extension. On a whim, I searched for an app & found yours. Truly a fantastic way to motivate & push myself during home based PT. Has given me a great sense of accomplishment as I see the numbers creep up as the weeks pass. At 6 weeks post op today, I am at 115 degrees of flexion and pushing forward. I would HIGHLY recommend this app!! The PT staff had never heard of a goniometer app and have also been impressed with its accuracy and how easy it is to use. Thanks for making a great app!Colleen NSan Francisco, CA

I had hoped to measure my own knee ROM, but although you can hit the start button, it’s super difficult to find the end button when the screen isn’t in your line of sight. Would be great to be able to click the home screen or a side button to start/end

This app is quite similar to the physical device that I use. The fact that it has been made so similar and easy to use makes it very easy to switch to the digital version.