TrueLevel - Bubble Level Angle

When a frame looks crooked, when you're mounting a shelf, when you're leveling furniture — the phone in your pocket becomes a precise spirit level. TrueLevel is a level and angle app that uses your device's tilt sensor to measure level and angle to 0.1°. No complicated setup — measuring starts the moment you open it. 📐 Level • Auto-switches to a 2-axis circular bubble when the phone lies flat, and a 1-axis bar when stood upright • Manual selection of Auto / Flat / Bar modes • Alerts you with sound and vibration when level is reached, so you don't even need to watch the screen • Choose the level threshold (±0.1° / ±0.2° / ±0.5°) 📏 Angle • Shows the absolute angle relative to horizontal • Set a zero point to measure the relative angle between two surfaces • Percent grade (%) display, handy for ramps and pipes 🛠 Calibration • Quick calibration (1-point): place it on a flat surface and it's done in about 1 second • Precise calibration (2-point): measure twice with the phone rotated 180° to cancel the sensor's own bias, staying accurate even on a tilted surface ✨ Convenience • Hold: freeze the reading for easy checking • Keep screen on, rotation lock • Light / Dark / System theme 🔒 Privacy • Uses only the tilt sensor. It does not request sensitive permissions such as location, camera, or contacts. Recommended for • Anyone installing frames, shelves, or curtain rails themselves • Anyone wanting to level furniture, washing machines, or refrigerators • Anyone needing to level a camping table or RV • Anyone who enjoys DIY and self-decorating ※ Measurement accuracy may vary depending on your device's sensor performance and does not replace professional measuring instruments. Calibration before use is recommended.