Apps similar to Altered Qualia include Primitive, which is free and open source. Other options are Primitive for macOS, Genetic Art and Shapeme. In total there are four apps like Altered Qualia for Mac, Linux, the web, self-hosting and Windows.
Primitive is a Go (Programming Language) command-line app based on Roger Alsing's great work, that reproduces images using geometric primitives such as ovals, triangles and rectangles.
United States
Based on the author's open-source Primitive project, Primitive for macOS adds a super intuitive interface to make it dead easy to process images, recreating them with primitive shapes like triangles, rectangles and bezier curves.
United States
Genetic Art takes an input image and reproduces it with primitive shapes, either lines, triangles, circles or squares. It's available online or as a self-hosted HTML/JavaScript web app.
Italy
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