You can utilize Facebook ads to measure interest from the target market you think would utilize what you are creating.

A landing page showcasing how your product can solve a consumers pain points followed by an option to receive updates via e-mail about the product would be the best direction to start with in my opinion.

Also, remember that not everyone will sign up for your interest list so you'll want to setup a Facebook Pixel and then an audience. By doing this you can later send out a completely different Facebook ad to everyone who viewed the page regardless if they provided information or not.

Hope this helps!