Flying Ruler Support
This free app measures the angle as you move the device.
- we completely redesigned the computational algorithm to improve accuracy
- support for all new devices, including iPhone 11 (Pro / Pro Max), iPhone SE 2020
- optimized for iOS 13, including support for light and dark appearances
- VoiceOver support is improved
- improved help system
- improved user interface
- other minor alterations and improvements
ACCURACY OF MEASUREMENT
We took 100 consecutive measurements and got these results:
On iPhone 8:
• Mean squared error - 0.16%
• Maximum inaccuracy - 0.5%
On iPhone X:
• Mean squared error - 0.19%
• Maximum inaccuracy - 0.6%
On iPhone 5:
• Mean squared error - 0.29%
• Maximum inaccuracy - 1.3%
The accuracy of measurements depends on the device, however the error rarely exceeds 2%. You can always increase accuracy by making a series of measurements. If you make a series of measurements, the degree of error is usually 0.5% or less.
For greater precision, long distances should be measured in parts.
The app cannot replace a ruler completely as a ruler has a fixed degree of inaccuracy (half of the smallest increment) but it is useful for getting an approximate measurement without a ruler as, remember, your device is always with you.
In some cases, when you know that the distance is some kind of standard size, you can say with a degree of certainty that you will get an accurate result. For example, if you measure a piece of furniture, which is nearly always a length in multiples of 6″, and you get 2′ 11 3/4″ then more than likely the real result is 3′. Or if you are using the metric system, if you get 60.5 cm then more than likely the real result is 60 cm.
Angles can be measured with the app to an accuracy of one degree so the app can easily take the place of a protractor or a goniometer (angle measurer).
Perhaps you will be interested in this. We have measure a reference length of 1 meter on the iPhone 8. Here are the results of the 50th measurement: 99.9, 99.9, 100.0, 100.0, 99.9, 99.9, 99.9, 100.0, 100.0, 99.9, 100.1, 100.3, 100.3, 100.2, 100.0, 99.7, 100.0, 100.1, 100.0, 99.9, 99.8, 100.1, 99.9, 100.1, 100.2, 99.9, 99.9, 100.1, 99.9, 100.3, 100.0, 100.0, 100.4, 99.7, 100.1, 100.0, 100.2, 100.3, 100.2, 100.0, 99.9, 100.0, 100.1, 99.9, 100.1, 100.3, 100.0, 100.0, 100.1, 100.0.