It's only a dollar but I read some reviews and learned that there are free level tool apps, so I downloaded "Bubble Level". It works perfect. I use mostly Turbo saddles and they all have to have the exact same tilt, down to the millimeter so this app is pretty convenient. Better than pulling over 3-4 times on a first ride with a new saddle to make adjustments. I don't need a tool for the setback like the Morgaw app has.