As Julia Lam mentioned, DocSend will give you the following info:
- Who opens your document
- Who they forward it to
- How long each person looks at each page
You can also update your deck after you send it out, and turn off access for individual people at any time. DocSend is primarily a sales tool, but it's a great fit for fundraising. You upload your document to DocSend, and then you email out a unique link to your deck each time you send it.
You can create free accounts here: https://docsend.com/invite/founderdating.