4/5 rating based on 41 reviews. Read all reviews for Dual Level- for iPhone.
Dual Level- is free iOS app published by Fellow Software Inc.
MrWizardly
How do you calibrate it? Even the most carefully assembles iPod isn't at zero. Unloaded it.
M_Port
I tried the level on my desk. In the landscape orientation (using the first bubble level) the app told me I needed to raise the left end of my phone to level the desk but when I switched to the portrait orientation (now using the second bubble level) the app said I needed to raise the right side of my phone. Such disparity in the two levels does not inspire much confidence. And, I could not see a means to calibrate the level.
Kayaker611
It is pretty to look at, and showing both axes in digital and analog is a good concept. Development suggestion: it would be handier if it was able to rotate itself on the screen, so numbers would stay right side up. Also, remove any active touch-links from the screen. On my iPad 1, accuracy is off between 1-4 degrees depending which side I measured, which would be good enough for leveling some things, but was not close enough for hanging a picture. I think this is a hardware flaw, not software. More annoying, if I press it against an object, I activate the Power Down button or the volume button, or my thumb on the screen touches something, sending me off to the app store, another app, or the Home screen.
D_L_K
On my phone, this app reads 63 degrees when the phone is at 45 degrees. It will read level when the phone is level.