Speak at Co-Work offices + Tech Meetups + Tech Conferences.

Give 100 talks (easier than you think) + monitor your App usages every 10 talks.

If people flock to your App, then just keep giving talks.

If they don't, then either your App requires retooling or your messaging/explanation requires retooling.

Be sure that you (or person speaking) has the ability to speak about tech topics in understandable terms.