Great tool for the budding enthusiast on a budget
If you never got fitted for your bike and you want a reasonably accurate way to gauge the quality of your bike fit, this tool is for you. For $6 you can get a good idea of your angles and measurements without breaking out your ruler or protractors. Found it relatively easy to use with a good guide though I wish the guide would give a diagram or photo example to show exactly where to measure from rather than just word descriptions. Does require a big clear space to place the camera far enough to capture video without too much perspective. Instructions recommended 10 ft but I found that it worked better around 11-12 ft. Also probably better to do this in a brightly lit room or outdoors so there is clearer video. I used this on my old iPhone 4 on IOS 7 without issue.
Machinegun_ak about
Bike Fast Fit, v2.4