The best alternatives to Google Font Pairing are 100 Mesh Gradients, mybrandnewlogo, and Shapy. If these 3 options don't work for you, we've listed a few more alternatives below.
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Shapy is a CSS gradient generator that lets you create shapes and images by layering and moving around gradients on a single div tag. Shapy is inspired by the Daily CSS Images challenge, Razvan Caliman's talk about devtools for designers, as well as Lynn Fisher's A Single Div project.