The Google Play Store is lousy with bubble level apps, but this one by Boy-Coy has just the right amount of skeuomorphism. An “LED” meter reads the angle of the level, and the app will beep as the angle approaches zero. And while the app shows advertisements, you can choose to hide them if you wish (in exchange for a minor guilt trip for not supporting the developers).
Link: Power Bubble – Spirit Level (Free)
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