The apps can work well, if you use them with boundaries for yourself. They are literally an introduction, so use the initial messaging just to meet for coffee. Meet loads of people - photos don't always show a person's attractiveness the way meeting them in the flesh does.
Message first if you want, arrange the coffee date too if they don't take that initiative - and then let them do the running. If they cancel the coffee date, or don't agree to one very quickly, bin them off - you don't want a pen pal.
Never let the coffee date last longer than an hour or so, however well you get on. You are a busy woman and your time is valuable. It's just a vetting to see if you want to date him, and if he is who he says he is.
You can also lay your ground rules there - 'I don't message much until I'm in a relationship, because I want to get to know you, not your virtual persona' or 'I'm on the app to date, not to spend time messaging'. Make it crystal clear that if they want to get to know you, they need to date you. By letting them take the lead from there, you get rid of those who aren't keen on you.
If you have many irons in the fire, you don't get caught up in the fantasy relationships, and by meeting early you get rid of people who are already taken or catfishing.