Bubble Level
An app that turns your phone into a spirit level and angle finder.
What Bubble Level does
Bubble Level is a free level app for Android with more than 10 million installs. It shows a classic tube level and a round bull's eye level, plus an angle finder, a digital readout and a ruler. Lay your phone on a shelf or hold it against a frame and you'll know if it's straight.
Sometimes you just need to hang a picture straight. Bubble Level copies the look of a real spirit level, with a tube bubble for edges and a round bull's eye bubble for flat surfaces like tables and washing machines.
Beyond the bubbles, it has an inclinometer to measure slopes and angles, a digital level that shows the exact tilt, and a ruler for small distances. If readings look off, you can recalibrate on a flat surface or reset to the factory calibration.
It's free and shows ads. It's highly rated on Google Play, though it was last updated in August 2025, so it's not changing much. For quick DIY jobs it does the job well. For anything structural, double-check with a real level.
Alternatives to Bubble Level
Who it's for
Skip it if: Structural work that needs a pro-grade level.
Pricing
Free planFree with ads. The Google Play listing doesn't show any paid upgrade prices.
Prices can vary by country. Checked 19 Oct 2026.
What people like
- Very highly rated on Google Play
- Several level styles in one app
- Easy to recalibrate
- Free
Watch out for
- Shows ads
- No iPhone version confirmed
- Not updated since August 2025
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Questions people ask
Is Bubble Level free?
Yes. It's free on Google Play and shows ads.
How do I calibrate Bubble Level?
Place your phone on a surface you know is level and use the calibrate option. You can also reset to factory calibration.
Can Bubble Level measure angles?
Yes. It has an inclinometer and angle finder for slopes.