Bubble

Over 6 million downloads! A Bubble level. Hold any of the phone's four sides against an object to test it for plumb/level, or lay it down on a flat surface for a 360° level. Features: Calibrate each side of the phone independently. Show the numeric angle. Speak the angle out loud. Flash the light, beep, or buzz when level. Show the angle as pitch. Tap screen to lock angle.

Use the opportunity to get the .apk setup package of Bubble 2.0.1 for free and have a look at users' reviews on Droid Informer. This installation package occupies 208 KB of disk space and it can be launched on Android devices 1.6 and above. The antivirus report shows that the app is completely safe. Ben Zibble is the developer of this application which can be found in the Tools category.

Bubble has been downloaded and installed by over 5M users and its latest update was released on Jul 9, 2011. Google Play shows that the app is rated 4.5 by its users. Samsung and Asus users recommend this application.

The way users see it, the strong points of Bubble are a good interface and customization features. Some users indicate that you can find a battery drain among the drawbacks of the app.