The best alternatives to Polyhedricom are Sharpen, Creact, and Dash . If these 3 options don't work for you, we've listed a few more alternatives below.
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Sharpen is a free design challenge generator used by tens of thousands of designers and educators worldwide to practice and teach graphic design, UX, branding, and more.
Expand your skills as an artist with daily art challenges. Categories include drawing, photography, painting, and typography. The best way to improve is daily practice. Challenge yourself and your friends to create something new every day with Creact!