The best alternatives to bttn.css are animista, CSSRooster, and Transformicons. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Animated symbols and buttons packaged for Sass & CSS. We also provide a builder that gives developers the ability to select their preferred Transformicons and output for finer control.
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.