Shapeme is described as 'Inspired by Roger Alsing's great idea, Shapeme uses SDL to evolve images with simulated annealing' and is an app in the Development category. There are four alternatives to Shapeme for Mac, Online / Web-based, Self-Hosted solutions, Windows and Linux. The best alternative is Primitive, which is both free and Open Source. Other great apps like Shapeme are Primitive for macOS (Paid), Altered Qualia (Free, Open Source) and Genetic Art (Free, Open Source).
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.
Altered Qualia Evolve takes an input image and reproduces it using shapes of various colors and transparencies. It uses a simulated annealing-like optimization algorithm based on the great work of Roger Alsing.