Selling tools to tool builders is a tricky proposition.

Apps like these sell to enterprises (large and small). You are almost certainly talking to the wrong people (although I am sure potential users looked like the right people to start with).

Tell the world just what problem your app uniquely solves and see what happens.

N.B. You will need to convince enterprises (start-ups etc.) that you are there for the long term and that your infrastructure is secure, robust and 99.99% available.

Good luck.