Spirit Level for Camera is a free app that helps you level your device before taking a picture. It uses the device's sensors to show the angle of rotation (pitch and roll) using horizontal and vertical green lines. All you have to do is align the green lines with the fixed white axes and your device will be facing straight up! No more skewed pictures! You can preview the camera in landscape and portrait modes while you are aligning the lines, i.e., straightening the device. You can also flip th