I did a fair amount of research on this because I hit the same wall.
Pricing models are all over the place. Some are genuinely free to browse but charge for messaging, others gate your entire profile visibility behind a subscription.
Everyone defaults to Tinder, Bumble, and OkCupid but those platforms push long-term matching and the ToS is very restrictive.
After getting fed up with mainstream options I tried Flamedate and it was honestly a much better experience overall.
Good luck — once you find the right fit it's worth the trial and error.