The makers of the app have this to say about it:
“We believe that encouraging creativity in people brings new ideas and diversity into the world,” says Eugene Valuev, founder of Ultralab. “That’s why we’ve created the Ultramask app in collaboration with promising artists. We hope that by introducing our users to the latest trends in digital art we’ll prompt them to create their own art peices.”
Here's my starting image:
After adding various shapes and lines with Ultramask:
Taking it one step further with the help of Snapseed I cropped and adjusted using Details- here is the result:
In it's current version, I would use Ultramask in combination with others. To make it a stand alone app here's what I think needs to be added:
Allow for Full Resolution Save, Crop Tool, Simple adjustments like Exposure, Contrast, etc. Also adding other colors besides black or white for the overlay patterns would allow for more creativity.
If you'd like a promo code for this app (I have ten to giveaway), just leave a comment. The first ten commenters will be the lucky winners!
To see a bit more of what Ultramask can do, here's the promotional video.