Email QA tool for dev & testing people out there

Hey Everyone,
We are working on our new product. You may check at www.mailnest.io.
It's a email QA tool for Dev and testing teams. Mailnest is used to ensure deliverability, quality and device/browser compatibility of emails that are part of applications you develop.
Appreciate you could try it out and let know feedback. Also would like to be guided on pricing it.