In my mind they are essentially the same, having used both patterns in different projects.
While there are some minor variances in naming conventions, the core concepts are strikingly similar and most developers use a mesh of different naming conventions anyway, which leaves the core concepts of using small "utility" or "atomic" structures within the CSS.
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Do you know if "atomic css" is the same thing as "utility-first css"?
In my mind they are essentially the same, having used both patterns in different projects.
While there are some minor variances in naming conventions, the core concepts are strikingly similar and most developers use a mesh of different naming conventions anyway, which leaves the core concepts of using small "utility" or "atomic" structures within the CSS.