Popular dating apps focus on showcasing manicured appearance, purported beliefs, pedigree, and witty banter. These signals are intended to help people decide whether or not they're attracted to someone before meeting in person. But notably, the sound of someone's voice is typically left as a surprise until the first date.
While technically you can schedule a phone call before meeting in person, understandably many people prefer to wait to exchange numbers until they've met face-to-face as a matter of safety, so asking can get awkward. And even if you've exchanged numbers to text outside the app, talking on the phone may feel too intimate.
It'd be interesting if there were a dating application that had users record themselves reading a short passage so that people could factor in whether or not they feel attracted to the sound of someone's voice.