Softlight, developed by duddel Labs, is a free Android app that allows you to use your smartphone or tablet as a softbox for photography. With this app, you can easily pick a color within the HSV color space, adjust the screen brightness, and send colorful light into your scene, allowing you to simulate sunsets and other lighting effects.

The app is incredibly easy to use - simply tap the background to show or hide the color controls. Softlight has plans to add more features in the future, including color gradients, color patterns, and more. If you have any suggestions for the app, you can contact the developer directly.