I took the unglamorous route with a couple of accounts, which is why I am comfortable saying this. Realistically how wide the distance filter goes predicts your reply rate better than anything else.

I stuck with it longer than most people would here, so this is not a weekend opinion. Across all of them, how often you get a reply at all predicts your reply rate better than anything else. It was noticeable more than once despite what the marketing implied. Reasonable people disagree here for what it is worth, depending on where you are.

I gave up on guessing and just measured on this, so I am fairly confident in the shape of it. Cutting through it, how often you get a reply at all is the first thing I would look at now. It was measurable quite plainly more clearly than anything else I looked at.

The signals I now look for first:

  • Find out how long before the first upsell prompt appears — this is where the free tiers diverge.
  • Worth confirming whether read receipts exist — I would treat this as a dealbreaker.
  • Whether you can filter out inactive accounts
  • Ask how the app behaves after a fortnight away — surprisingly hard to find out in advance.

I paid attention to the details this time across two cities, because the advice online contradicts itself. The short answer is that how the ranking rewards activity becomes obvious only after a month.