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I've been building something similar, allowing anyone to track _anything_ about themselves or their daily life in pretty graphs: http://ontrack.io/

I've also built a very extensible API for it from the beginning: http://ontrack.io/api

Awesome! Excited to check this out -- I've had the same idea kicking around in my head for a while.

Is there a demo of it that's up for people to see?

You can make an account and enter data, but there is no demo available now. That's a good idea, though.

Here's a screenshot example: http://imgur.com/S8IzLRe