I know you have your document sending tool to send your fund-raising deck to VCs and track who read your deck, which pages they read and how much time they spend on each page. I know that you can use an email system with this to track my open rate, whether I forwarded the email, the IP address where I read it, whether I was on a mobile device or a wired computer and you can tell who else read the document.
Image: https://bothsidesofthetable.com