Spirit Level - Bubble Measure is a utility tool available on iPhone designed to determine whether a surface is horizontal or vertical. This tool is useful for various professionals such as carpenters, stonemasons, bricklayers, and surveyors. It allows users to measure the incline of an object by holding it against the target for level or plumb readings, or by placing it on a flat surface for a 360° level measurement.

Users can calibrate each side independently and also calibrate the spirit level relative to another object for accurate measurements. The tool displays angles in degrees, functions as an inclinometer, and provides multi-direction bubble incline measurement capabilities.