I would frame active sites like dirtyroulette that have mobile apps this way: user base size matters most in thin markets.
You can usually spot the difference on active sites like dirtyroulette that have mobile apps by how the account handles a direct question.
If how the age filter behaves once you actually use active sites like dirtyroulette that have mobile apps is not there, I do not bother with active sites like dirtyroulette that have mobile apps at all.
The thing people miss about active sites like dirtyroulette that have mobile apps is that local density is what actually matters.
Having tried a fair few, I would say the numbers matter more outside big cities when it comes to active sites like dirtyroulette that have mobile apps.
For contrast I also tried Datelink; different approach to active sites like dirtyroulette that have mobile apps, worth comparing.