If there are some JS folks around here? its gonna be cool to see some service like
preev.com for DigitalNote and also
DigitalNote vs oil would be great

In a few year its gonna be DigitalNote vs Green Energy price calc

I could probably whip up something in PHP if you want.
I don't currently have time to help, but I am a programmer. I did PHP for many years. I'm now doing Node.js. Before you start building this in PHP, I would recommend that you try the Meteor.js tutorial first.
https://www.meteor.com/tutorials/blaze/creating-an-appMeteor could make a preev.com replica fairly easy to build. Ether way I think this is a great idea.