Bubble Level

HSCN Apps

In-app purchases

About this app

Bubble Level turns your phone into a practical spirit level for everyday checks — hanging a picture, leveling a shelf, checking a floor, or helping an appliance sit level.

MEASUREMENT MODES
• Level Mode — place the edge of your phone against a surface to check horizontal alignment.
• Plumb Mode — place the edge of your phone against a wall, post, or frame to check vertical alignment.
• Flat Mode — place the front or back of the phone on a surface to measure tilt across two axes.
• Camera Mode — view adjustable alignment guidelines over the live camera preview (Pro).

WHERE IT HELPS
• Hanging pictures, mirrors, and shelves straight.
• Checking whether furniture and appliances are level.
• Checking walls, door frames, and posts for vertical alignment.
• Getting a rough indication of floor, terrace, or walkway slope.

FREE — INCLUDED FOR EVERYONE
• Level, Plumb, and Flat modes.
• Angle readings in degrees.
• Visual alerts with an adjustable range and color.
• Optional alerts at multiples of 45°.
• Selectable reference edges and automatic reference selection.
• Press-and-hold lock to freeze a reading.
• Guided calibration with one calibration profile.
• Warnings for incomplete calibration or low sensor accuracy.
• Up to 3 saved measurements, with copy and share.
• Dark theme, keep-screen-on option, and decimal display settings.
• Available in many languages.

PRO — ONE-TIME PAYMENT, NO SUBSCRIPTION
• Camera Mode with adjustable live guidelines.
• Additional units: percent, in/ft, and mm/m.
• Sound and vibration alerts.
• Button lock and 5-second delayed lock.
• Two additional calibration profiles for different case setups.
• Unlimited saved measurements.
• Custom theme color.

PRIVACY
• No ads, accounts, sign-up, or tracking.
• Measurements are stored on your device. The app does not upload them.
• Camera Mode runs entirely on your device. The app does not upload anything from the camera.

CALIBRATION
The guided calibration wizard covers six orientations: back, front, bottom, top, left, and right. Calibration corrects the constant offset caused by sensor alignment and the shape of the device. You do not need a perfectly level reference surface.

ACCURACY AND LIMITS
This app is a practical aid, not a certified measuring instrument. Readings depend on the device, conditions, and calibration. Calibration can correct constant offset but cannot eliminate sensor noise or scale errors that grow with angle. Camera Mode shows the tilt of your device, not the true geometry of objects in the image.

Do not rely on this app alone for professional work, structural assessments, or safety-critical decisions. Use an appropriate measuring instrument and consult a qualified professional when necessary.

Ratings and reviews

great app/tool and it has a very clean interface. Dev very clearly paid attention to details. As for the other reviews being thankful that there are no ads, yes that's great and all but would (THEY) work for FREE? Almost guaranteed they wouldn't.. Remember.. Programming is a job/career just like any other category.. After all, Programmers have to make a living.. so even if there were ads, you shouldn't have a problem with ads in a FREE app

So pleased with this app. I had to really search through the play store to find an app that wouldn't collect data and didn't have ads. This is it. Clean, simple interface. You can spend $1.99 for "pro features" like changing the color scheme or using the camera function, which I may eventually do. I really hope these developers make money from the pro features, because I'm just so grateful it doesn't contain ads with the free version. 10/10, would recommend.

Functional. App does exactly what it says. There are more aesthetically pleasing apps that have intrusive ads and have VERY expensive subscription fees. Even the free version of this app is ad free. I paid for the pro version simply because it isn't $14.99/WEEK like the better looking ad that is nearly unusable due to the ads. I like supporting developers of functional apps that don't waste half of your day with obnoxious ads too though. Edit: Please add vibration to the alert not just sound

What’s new

🎯 New: Custom alert range you can set anywhere from 0.05° to 5°, for finer tolerances
💡 New: Reference edge highlight that shows which edge the reading is measured from
✨ New: Preview cards that show what the Pro features actually do
🔄 Improved: Plumb Mode now works with the device upside down, and uses the left and right edges as the reference