Best Bubble Level Apps for DIY (iPhone & Android)

For DIY, the cleanest bubble level apps are Bubble on Android and Bubble Level Plus+ or Digital Angle Finder on iPhone, with the Lapnito level (made by this site's operator) as a capable fourth choice that behaves differently on each platform. A phone level is handy for hanging shelves and pictures, but it is no replacement for a real spirit level on precision work.

How we picked

A level app reads the accelerometer, so the useful differences are in calibration, extra measurements and how much the app wants from you. We compared:

Privacy label. The App Store “App Privacy” section and the Google Play “Data safety” section, read from the store pages.
Ads and purchases. Whether the listing shows ads, in-app purchases or a paywall.
Features for DIY. Calibration, angle and slope readouts, and a bubble that is easy to read at a glance.
Maintenance. When the app was last updated and how many people have rated it.

This ranking is based on store listings, privacy labels and developer documentation checked in October 2026. We did not measure the apps against a reference level, and privacy labels are the developers' own declarations. Ratings and prices change, so check the store page before you install.

Our picks, ranked

1. Bubble (Android)

Bubble by the developer woheller69 is a spirit level and ruler that measures angles and inclination: you align one side of the phone with an object, or lay it on a surface. F-Droid lists it as ad-free free software under the GPL, with no special permissions beyond keeping the screen awake, and version 3.5 dated 14 August 2026. We could not find it on Google Play, so you install it through the F-Droid store.

Pros: free, open source, no ads, almost no permissions, includes a ruler in cm and inches.
Cons: Android only and not on Google Play; a deliberately plain tool with few extras.

Get it: F-Droid

2. Bubble Level Plus+ (iPhone)

Bubble Level Plus+ by Tue Nguyen Minh is the most-rated iPhone pick here, with a 4.6 average from about 15,300 ratings on the US App Store. The label reads “Data Not Collected”. The app is free with two in-app purchases listed at $0.99 and $1.99. It was last updated in November 2025.

Pros: widely used, clean privacy label, cheap one-off purchases, simple to read.
Cons: free but with in-app purchases; we could not confirm from the listing whether the free version shows ads; the description is dated.

Get it: App Store

3. Digital Angle Finder: 3D Meter (iPhone)

Digital Angle Finder by Alexey Brilev measures the angle of the phone with the accelerometer and gyroscope, so you place it against two surfaces in turn to get the angle between them. A protractor mode measures angles between lines, and you can save a photo with the angle written on it. The label reads “Data Not Collected” with no in-app purchases listed, and it was updated in March 2026. It has a 4.1 average from about 240 ratings.

Pros: free, clean privacy label, no purchases listed, good for the angle between two surfaces such as shelf brackets.
Cons: angle-focused rather than a classic bubble vial; the developer's own accuracy figure is about one degree, which is coarse for fine carpentry.

Get it: App Store

4. Bubble Level & Inclinometer / Bubble Level: Angle & Pitch – Lapnito (made by this site's operator)

Disclosure: this app is made by lapnito.cz s.r.o., the company behind Best Mobile Apps. On iPhone, Bubble Level & Inclinometer is free with no in-app purchases and the label reads “Data Not Collected”. It offers a bullseye level, horizontal and vertical levels, and an inclinometer in degrees, percent grade, mm/m and roof pitch, plus a guided 180-degree calibration and a tolerance mode with haptic and sound feedback. The Android version, Bubble Level: Angle & Pitch, adds a camera clinometer and an AR laser line, but its Google Play listing shows ads, and its Data safety section lists app activity, app info and device IDs as collected and app activity and device IDs as shared with third parties.

Pros: rich DIY feature set, guided calibration, clean and ad-free on iPhone.
Cons: new, with no ratings on the US App Store when we checked; on Android it contains ads and its Data safety label is much weaker than on iPhone.

Get it: App Store · Google Play

5. Bubble Level Galaxy (Android)

Bubble Level Galaxy by Szymon Dyja is a very popular simple level, with 5 million or more downloads and a 4.7 average from about 95,000 reviews on Google Play, plus a ruler and an LED flashlight. The listing shows ads, and the Data safety section says device or other IDs may be shared with third parties.

Pros: very popular, easy to read, free, extras like a ruler and flashlight.
Cons: contains ads; device IDs shared with third parties per the label; Android only.

Get it: Google Play

Comparison at a glance

Bubble: Android via F-Droid, free, no ads, open source, almost no permissions.
Bubble Level Plus+: iPhone, free with small purchases, Data Not Collected, most-rated of the iPhone picks.
Digital Angle Finder: iPhone, free, Data Not Collected, angle-focused, no purchases listed.
Lapnito level: iPhone free and Data Not Collected; Android has ads and a weaker label.
Bubble Level Galaxy: Android, free with ads, device IDs shared per the label, very popular.

Tips for accurate readings

Calibrate on a surface you know is flat, then flip the phone 180 degrees and check that the reading mirrors. If it does not, recalibrate.
Measure along a flat edge of the phone, not across the camera bump, and take thick cases off.
Take two readings with the phone turned around and use the average on important jobs.
Use the phone for pictures, shelves and curtain rails. For structural work or tiling a floor, use a real spirit level or laser.
The iPhone also has a Level tool inside Apple's Measure app, so you may not need to install anything for a quick check.

Which one should you pick?

On Android, Bubble is the cleanest choice if you are happy to install from F-Droid; otherwise Bubble Level Galaxy is simple but ad-supported. On iPhone, Bubble Level Plus+ and Digital Angle Finder are both solid and both show Data Not Collected, and the Lapnito level is a feature-rich free alternative with the shortest track record. Do not treat any phone level as a precision instrument.

Frequently asked questions

Are phone bubble level apps accurate?

They are good enough for hanging pictures and shelves once calibrated, usually within about a degree. For precision work use a real level.

Do level apps need an internet connection?

No. They read the phone's motion sensors, so they work offline.

Why do some level apps show ads?

Free apps often rely on ads or tracking. The Data safety and App Privacy sections show what each app declares.

How do I calibrate a bubble level app?

Place the phone on a surface you trust to be flat, press calibrate, then flip it around and check the reading. Most apps explain the steps on screen.

Disclosure: Bubble Level & Inclinometer (iPhone) and Bubble Level: Angle & Pitch (Android) are developed by lapnito.cz s.r.o., the company behind Best Mobile Apps. They were judged by the same criteria as the other apps.