Update 12/08/2018: since my review below from about 2 years ago, the developer has posted several updates, none of which addressed the problem and a few of which simply resulted in a crashing app. The inaccurate ruler continues to be inaccurate as previously described. The incompetency on display here is simply stunning.
Original review:
The ruler feature is grossly inaccurate on my iPhone 6s. It’s actually off by exactly half (2” is really 1”, for example). It’s inexcusable that this has persisted for so long.
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