Blackmagic Camera
FreeDuo-native
Film-camera controls for iPhone video
Registry/ Apps /Gridium
On the Duo: Duo-native. Its maker's site shows the collage on the left and the tools on the right of the open Duo. Checked November 5, 2026.
App Store data as of October 27, 2026
Why it's here
Not for
Anyone after a full photo editor rather than a collage maker.
About Gridium
Gridium turns a set of photos into a collage for Instagram, a story, WhatsApp or print. It has 43 templates for 1 to 16 photos, including grids, magazine pages, moodboards and before-and-after layouts, plus a free canvas in square or 9:16 where photos, text and stickers can be placed, scaled, rotated and layered. A built-in editor handles cropping, nine filters, brightness, contrast and borders, and 32 output sizes cover social formats and A3 to A6 prints.
On the iPhone Duo, its maker's site shows the collage on the left half of the open phone and the editing tools to the right of the fold.
