Day One just announced a new app called Publish, extending its journaling platform to a publishing (surprise!). Signup for the beta here: https://dayone.me/
I use it every day :)
Heyday is great, too. But that's more of a passive auto-aggregation of things. Day one is my place where I take a few minutes each day and do a brain dump of the good, the bad, and what I'd change.
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