Before committing time to free personals dating sites for casual, work out how much data leaves the app.
Ran the site alongside two other options for a month, tracking how quickly it starts asking for money.
If your area is thin, it will not fix that, whatever how the pricing behaves once you are invested looks like.
If you only test one thing on the site, make it what the free ceiling looks like in practice.
Once I fixed my filters, what the free ceiling looks like in practice stopped being the bottleneck on that one.
Take that as one data point on free personals dating sites for casual rather than a verdict.