Cool project! Will help people get an idea of the cost of development for an app. I'm planning to run an app for my digital marketplace masterbundles.com. After estimation, I understood what features are most expensive. It is a cool tool for cost optimization too
It is free, am I right? It looks like a simple but still useful tool.
What about your audience? I think it is not only a checklist for designers but a prompt for those who are working on website conversion.
Looks promising. Definitely worth to try to improve your website by yourself without assistance of UX/UI team. Of course if you have the understanding in design principles :D