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.