TrueBubble is a free, ad-free spirit level app for Android - precise, clean, and built with passion.
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- Two level modes
- Linear level (Poziomica) — dual-axis horizontal and vertical vials with real-time pitch & roll readout
- Bullseye level (Libella) — circular 2D level for simultaneous pitch and roll
- Bubble customization — 9 bubble colors including metallic gold and silver
- High-contrast mode — improved bubble visibility
- Sensor calibration
- Auto calibration (50-sample average against a reference level)
- Manual calibration — fine-tune Pitch and Roll offset in 0.01° steps or by direct input
- Position lock — remember a reference angle and compare in real time
- Level feedback — optional sound and vibration signal when 0° is reached
- Dark / Light theme
- 10 languages — Polski, English, Español, Deutsch, Français, Português (BR), العربية, Русский, Bahasa Indonesia, 日本語
- No ads, no tracking, no internet permissions
TrueBubble is currently in closed testing on Google Play, so the install link only works for testers. It takes two clicks to get in:
- Join the tester group - sign in with the same Google account you use on the Play Store, then hit "Join group".
- Open the Play Store testing link on your phone - once you're a member, Google Play unlocks the install button for you automatically.
That's it - after the first install, TrueBubble updates itself through Google Play like any other app.
- Android 8.0 (API 26) or higher
- Accelerometer / gravity sensor
git clone https://github.com/moskil2/TrueBubble.git
cd TrueBubble
./gradlew assembleDebugOutput APK: app/build/outputs/apk/debug/app-debug.apk
- Marker lines (zero-position marks) drawn on top of bubble in both linear and bullseye modes — matches real-world vial appearance
- Manual calibration: fixed text field input (minus sign, comma, backspace now work correctly)
- Calibration button renamed to "Start auto calibration" in all languages
- "Manual Correction" section renamed to "Manual Calibration" in all languages with updated description
- Section label font size increased in calibration screen
- Mini vials in calibration enlarged, live angle readout font increased
- Minus button in manual calibration highlighted green (same as plus button)
- Gold / Silver bubble color now correctly applied in all mini vials (Libella mode and Calibration screen)
- Mini vials enlarged in manual calibration; live angle readout font size increased
- Section labels in calibration screen enlarged
- Minus button in manual calibration highlighted green
- Gold/Silver bubble color fixed in Libella mini vials and Calibration screen
- Libella (bullseye) mode: marker lines now drawn on top of bubble
- Linear level: marker lines now drawn on top of bubble
- Mini vials in Libella mode: marker lines on top
- Manual calibration text input fixed (flag-based editing prevents sensor overwrite)
- "Start auto calibration" button label updated across all 10 languages
- Manual calibration section renamed from "Manual Correction" to "Manual Calibration" in all languages
- Updated calibration description text in all languages
- Bubble color gold/silver fixed in Calibration screen mini vials
- isMetallicBubble state added to CalibrationViewModel
- Mini vials enlarged in calibration (vertical: 18×40 → 24×54 dp, horizontal: 48×18 → 62×24 dp)
- Live angle readout font: 14sp → 18sp
- Section label font: 11sp → 13sp
- Minus button green highlight in manual calibration
- Libella mode mini vials: isMetallic parameter added (gold/silver bubble fix)
- CalibrationScreen: isMetallic passed through OffsetAdjustRow to mini vials
- Gold and Silver metallic bubble styles added
- Bubble color selector expanded to 9 options
- Metallic rendering for all vial types
- Initial release
- Linear level + Bullseye level modes
- Auto calibration
- Manual offset correction
- 10 language support
- Dark/Light theme
TrueBubble does not collect any personal data. All data (calibration, settings) is stored locally on your device only. No internet connection is required or used.
© TrueBubble — All rights reserved.