Spirit level and ruler
About this app
With Bubble you can measure angles and inclination.
Simply align one of your phone's four sides with an object or place it on a level surface to determine its orientation.
A ruler in cm and inches is also available.
Experience a user-friendly and ad-free solution with no permissions required.
Licensed under GPL-3.0-or-later, by woheller69.
What's New in v3.4
Imported from the F-Droid repository index.
- Bugfix
Version history
Mar 29, 2026 · 1.3 MB · Android API 16–35 · code 34
Imported from the F-Droid repository index.
- Bugfix
SHA-256 fa8028c4d7323e64757486baba1eeaf6e3c7f9ff4349ae84b0d88fe2a8f5428c
Mar 20, 2026 · 1.3 MB · Android API 16–35 · code 33
Imported from the F-Droid repository index.
- New option for offset angle
SHA-256 75f0e27a47532d21950998c307c40cac2163528698e781db1a99cc520694fd62
Sep 1, 2025 · 1.3 MB · Android API 16–35 · code 32
Imported from the F-Droid repository index.
- Show deprecation warning
SHA-256 58d85d1cb2c62ec48db2c62b7a36c31b7d941ce2ce67d504115fbc5f063985e9
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.woheller69.level is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 3.3 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Bubble first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Bubble, and a listing is removed when the evidence for it stops holding up.
Get Bubble
Every source we list for org.woheller69.level is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
fa8028c4d7323e64757486baba1eeaf6e3c7f9ff4349ae84b0d88fe2a8f5428c
Signing certificate
234ebfa74fee9820292966977748b6d95cd75b4fcb1eed381d8648b36e14f5ca
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.