I ran across this earlier this week and I'm giving it a go. The first 30 days are free, after which it is a paid subscription that costs $5 a month. I'm hesitant about that, but the program is very, very cool.
In short, the site owner has figured out that 750 words is approximately equal to the 3 longhand journal pages made popular by Julia Cameron in The Artist's Way. He's made it a little more fun by creating a point system and badges to earn. He's created monthly challenges, that one can choose to join, with a wall of honor and a wall of shame.
The typing surface is clean and it has a little counter in the lower right so you know how many words you have left to do. A little flag pops up when you hit 750 words. He uses all sorts of automated algorithms to create reports about what words you're using most and what mood a piece of writing has. (He states that these are still experimental and the results should be taken with a grain of salt.) He's built in some metadata functionality that allows a person to basically tag numerical information which then will be converted to charts you can view.
An example: If in the 750 words you type "WEIGHT: 186", the program knows you want that datum to be made available (with others which are also marked with WEIGHT:) in chart form.
There's more stuff too, but I'm still poking around. If you decide to give it a go, think about if you want to sign up with your real full name or a pen name. I went with Renae Penn and I only share my stats with other members of the site. (Words written and time required.)
I think this kind of writing is very personal so I'd never share it. Right now, I am spending about an hour a day doing personal writing, between the 750 Words and listing my gratitudes here on my SP blog. It does seem to be clearing my head and making me more productive otherwise.
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