This is executed very well. I love the natural language processing for diary entries.

However I think you need to change your pitch if you want more incoming traffic. At the moment this has an aura of creepiness and vainness to me and no chance of SEO (who googles for "track every moment of my glorious life in detail"?). You should configure this for whitelabelling and create a version for different markets.

This is just one idea because I knoe my wife would love it:

Dieters to track calories eaten each day and exercise done. Would be awesome to see energy counts of food eaten vs energy consumed by exercise done - maybe like a weekly comparison of energy in and out.