How they compare
OnlyFans and Fansly work the same way at heart: you subscribe to individual creators for their posts, messages and paid extras, and each creator sets their own prices.
OnlyFans wins on numbers. It's the default platform, so almost any creator you already follow is there. Its weakness is discovery: there's little built-in browsing, so you usually find creators somewhere else first.
Fansly fixes exactly that. You can search and browse creators on the platform itself, and creators can offer several subscription tiers instead of one price. It has a big creator base, but fewer of the top names than OnlyFans.
On both, costs add up quickly across several creators.