Bubble Level & Screen Ruler

LevelRule brings a bubble level, calibrated on-screen ruler, and touch protractor together for quick checks around the home, workshop, or job site.

Key features

• See live pitch, roll, and total tilt with a clear bubble display.

• Set any surface as zero to compare an existing slope or reference plane.

• Measure small objects in millimeters or inches directly on the screen.

• Calibrate the ruler with display DPI, a custom DPI, or a known object.

• Drag two protractor arms to measure the angle between them.

• Capture labeled readings with notes, reload saved scenario snapshots into active tools, and share results when needed.

The app uses device motion sensors for leveling and does not require a camera permission. Ruler accuracy depends on device display metrics, so calibration is available for better results.