The best alternatives to CSS GUI are MagicPattern, UI Colors, and Bootstrap Build. If these 3 options don't work for you, we've listed a few more alternatives below.
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Create a Bootstrap theme in the builder tool and export SASS or full Bootstrap CSS build. Start from scratch or reuse hundreds of ready-to-go free Bootstrap themes.
Use ready-made sections and low-level elements in the free Figma UI library to create amazing projects. Integrate them with Shuffle Editor to get Tailwind CSS components and speed up your developer's work.