The app is cool man good work! old school boy here made an vi alias to my journal.txt file and have been using it for 5+ years. alias opens the file in edit mode on a newline at the bottom. VI search lets me find whatever i need quickly all from the keyboard!

This whole 'email yourself as diary' seems like overkill to me when you could just write something yourself. Unless you are cool with sharing your diary with 3rd party services. Anyways it's still a cool little thing, just throwin my two cents.

In Gmail you can search by dates. And for convenience I've a filter for from me to me with journal title.

Stats wouldn't be possible (of the top of my head) but I don't care about that much.