Smart Level - Apps on Google Play

Bubble level - Apps on Google Play

Grading Tools, Level For Grading

Smart Level - Apps on Google Play

Level with voice /Spirit level - Apps on Google Play

Educational Apps to Help You Learn While Passing the Time - The New York Times

Smart Level - Apps on Google Play

Bubble Level Galaxy - Apps on Google Play

Hardscaping Levels, Straight Edges, Screeding & Altimeters – Tagged Ziplevel Pro-2000

Platinum Level Perks : r/google