You don't need to launch this to get feedback. I would cold email five people who you think will find it useful.

Ask them if they have this problem you're trying to solve. Ask if they currently use something to solve that problem. Ask them for their feedback and if they'd be willing to pay for this service.

You can find emails pretty easily by using any of the following tools: saleshacker, voilanorbert, toofr, curtact, or http://emailhunter.co

If you can't get people in your target market with this painpoint to answer your email, you will have a hard time finding your first customers.