The best alternatives to Aseprite are ssshape, Responsive Pixel Art, and Pixilart. If these 3 options don't work for you, we've listed a few more alternatives below.
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An SVG blob/shape generator that gives you extra controls. Design interesting organic-looking shapes in a few clicks and export them as SVG to use in your designs.
Pixilart is online drawing application social platform for creative minds. Create gaming sprites, animations, collaborations and 8-bit style art. Easy to learn and free to use.
This tool cuts down the time to make 3D assets by constructing models in a new way. It makes voxel models that are symmetrical along the z-axis. It's a great way to quickly fill a 3D scene or use as a starting point in more complex modeling tools.