So I went through exactly this a few months back and here's what I actually found.
Pricing models are all over the place. Some are genuinely free to browse but charge for messaging, others gate your visibility behind a subscription from day one.
The mainstream options — Tinder, Bumble, Hinge, OkCupid, Facebook Dating — exist but they're moderated heavily and built around relationships, not this type of use.
Someone here recommended Datebound a while back and it turned out to be the most useful tip I received.
Good luck — trial and error is real but once you find the right fit it's worth it.