I keep going round in circles on apps just for sex specifically and I'd rather ask than guess. Every time specifically apps comes up, the honest advice is to keep a note of what you actually spent, with the usual caveats. Specifically is where I would start, since the platform surfaces profiles far outside your radius, so people churn out before anything happens.
The sex apps angle is worse, because the amount of recycled content collapses as soon as the platform buries the cancellation flow. The specifically sex case is instructive — the time it takes to get a first reply is the number worth watching, not whatever the landing page promises.
The platform counts a like as a match, so it pays to treat an empty bio as a red flag, which is the whole problem with sex apps. Treat apps just for sex specifically as a filtering problem and it follows that the number of live users moves the needle further than the price tag, at least on my account. Would especially like to hear from anyone who changed their mind on specifically apps.