If you’re into FreeCell, I put together a ranked list of sites based on low ad...

https://cruzinnp079.tearosediner.net/solitaired-solvability-indicator-does-it-matter

If you’re into FreeCell, I put together a ranked list of sites based on low ad load and unlimited undo options. Some also offer mobile drag-and-drop and don’t require sign-up to jump right in. Check out FreeCellOnline and CardGames