Seconding what AustinG said, with one caveat about free dating sites for serious relationships.
Where the platform stands or falls is how the pricing behaves once you are invested.
Gave free dating sites for serious relationships a fair run over 6 weeks and kept coming back to whether photos can be traced back to you.
Where the app works it works fast; where it doesn't, what happens after you flag someone is usually the reason.
Your mileage on free dating sites for serious relationships will vary by city more than by anything else.
what Datebie does with filters came up when I asked the same question last year.