My rule for free naughty dating sites now is simple: check what the real cost is after the trial on day one.
Deleted and reinstalled the app twice before accepting the issue was how aggressively it pushes credits at you and not my profile.
Provided how far the free tier actually stretches holds up, the platform is a reasonable place to start.
If you only test one thing on the app, make it whether the rules get applied evenly.
If this one does not work out, Datenest covers similar ground.