Several level applications have made their way to the App Store but as far as we can tell, none of them has been especially accurate.

Stanley appears to have changed that with their recent release of their level app.

As long as you calibrate this correctly, you can get near 100% accuracy. In tests published on several websites, testers were able to zero out on a flat surface and hit a perfect 90 degrees when placed vertically alongside a wall.

Plus, you can switch between four different skins to match the look of your level to real levels in Stanley’s product line. It may not be something you want to bring on the construction site, but if you have been waiting for a level app that can handle everyday tasks, this is probably as good as it can get on the current iPhone (and it won’t cost a dime, as its free in the App Store right now).