Flying Ruler: 움직여서 측정하세‪요‬ 4+

Out of 6 measurement apps I downloaded this is the only one I kept. Here's why
#1 it works. It actually measures any distances pretty accurately.
#2 ease of use/ versatile:
Drop phone at starting point and press button, pick it up when it turns green and drop phone off at end point. Whether inches or feet away. It doesn't matter.
#3 truth in advertising. All others say free and then you find you can't use them without paying money. This one says $1.99 up front. No tricks.
#4 cheapest and most accurate. The others use things like photos and they are just not as accurate as this one.
Improvements? Of course I'd like it better if it was free. But you get your money's worth. What measurement tape cost less and goes longer? And you always have it with you.
PS: the calibration method is so simple it may confuse you. Just drop phone on a flat surface as shown/ oriented on drawing and it automatically detects it and places a check mark. Repeat till all 6 drawings have a check mark.
Just pay attention to the drawing: which way is the button? (up, down, face down etc. )

I was looking all over the App Store for some measuring app to measure between walls and distances. The only thing out there were stupid apps were you had to hold your finger down and slide the phone hoping your fingers don't slide off the screen. This app is using technology to basically lift the phone and put it down from one point to another and the accuracy is extremely good but of course it will never equal a measuring tape. I can imagine using this while I'm out and about and needing to measure something in the store

This app does a phenomenal job of taking precise measurements. It's not 100% (with a case) so it can't replace a ruler for small measurements but it's pretty close (off by maybe a 1/16th")! It is by far the most superior app I have found on the market though!!