In addition to being able to take normal photos, you can also make photo collages in Retrica just by selecting that option. You can take single photos or take up to nine consecutive snapshots in order to create a fun, original composition.
Retrica also includes other options like artificial shading (also included in Instagram) or a timer, which allows you to take photos using a tripod.
Retrica is an excellent photo app. After triumphing in iOS, where it became one of the main points of reference in the category, it has now arrived to Android and it offers some very nice, completely free features.