Are you talking about ceiling fans? If so, I've found that their fan switches work flawlessly - no need to buy any kind of fan with smarts built-in: https://www.casetawireless.com/us/en/products/dimmers-switch...
(Search the page for "Original Smart Fan Speed Control Switch", there's seemingly no way to link directly to the requisite page section... which is a thing I could rant about but will not).