The best alternatives to SelectorsHub are Selector, Skeleton 2.0, and Jam API. If these 3 options don't work for you, we've listed a few more alternatives below.
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Blaze— Create beautiful 1-click content in your brand style with AI
Dizzle turns CSS selectors into functions that tests if elements match them. When searching for elements Features: * Full implementation of CSS3 & CSS4 selectors * Partial implementation of jQuery ext * Pretty good performance