Collages are one of the most popular trends in photo processing. Many applications can simply combine several photos separated by frames in one image. But for something more complex, for example, removing the background, applying masks, managing layers, etc., there are practically no options – only Photoshop. But, apparently, a holy place is never empty, and today we have a program on the test that can do all of the above. Superimpose is an app for iPhone that can change the background, join multiple images together, use masks, adjust colors, exposure, contrast, saturation, rotate, scale and perform many other operations on images. I must say that despite the large number of features, the program interface is not overloaded at all. Menu icons are neatly located on the top and bottom panels. To get started, you need to specify what the background will be. You can select an image from the Camera Roll, paste from the clipboard, or specify the desired color using the 'Pick color' tool. I chose the first option. Now select the second image, click on the 'Mask' button at the bottom, and at your service – a whole range of tools for working with masks. You can erase unnecessary things with the eraser, select a lasso, use radial blur, and many other cool options. The magnifying glass that accompanies your actions allows you to do all this as accurately and accurately as possible. And if something went wrong, any action can be easily undone. With the help of just one combination of masks, you can get very interesting, fantastic and harmonious at the same time, results. And if you also finalize the whole thing with the help of filters, it turns out completely great! The treated result can be exported in the desired quality, shared with friends on social networks or sent by email. True, I want to note right away that it is clearly not possible to understand everything right away. It takes some time to get comfortable with Superimpose. For example, I have sufficient experience with such a professional tool as Photoshop, and then, for the first few minutes, I do not understand what's what. But, if you work professionally in the field of image retouching, and use your iOS – device as an additional tool for these purposes, this application will be very useful. For beginners, I think it will be too difficult.