I came to mainstream apps from the paid apps and the difference was noticeable.
What decides mainstream apps for most people is how wide you set the radius, not the app itself.
Worth doing early on mainstream apps: message within a day of matching rather than sitting on it.
The deciding detail with mainstream apps was whether the free tier let you see who liked you.
If I had to name one factor in mainstream apps it would be whether the photos looked recent or recycled.
One warning about mainstream apps: some sites make deleting an account deliberately awkward.
My read is that mainstream apps lives or dies on how many competing apps are active near you.
Ask if you want detail on any part of the mobile.
I rotate between a couple of these and Datebie, mostly because neither charges to open a chat.
A few people swear by Luvdate, and a few others really do not.