Spirit Level is a free bubble level and inclinometer app that uses your smartphone's built-in orientation sensor. Whether you're a carpenter, construction worker, or just need to hang a picture on the wall, this app can come in handy.

To use the app, simply hold your phone flat horizontally or vertically, adjusting the bubbles between the center double lines. The app is easy to use and offers accurate readings, making it a reliable tool for any DIY project.

It's worth noting that some phones may give different sensor readings based on the hardware used by the manufacturer, and some phones with bad sensors may show inaccurate results. However, in our testing, Spirit Level worked well and provided accurate readings. Overall, Spirit Level is a useful tool for anyone who needs a quick and easy way to check for level and incline.