One feature to add might be a view for one year ago today. There are journals that have 365 pages and you write a line for each year of the highlights of the day. As you write the new year's line you end up reviewing what you were doing in previous years. It seems like you have most of the pieces to do this.
I use Oh Life for daily email journaling. One feature I really like is the "Oh snap, remember this? X days ago you wrote..." prompt, where X doesn't always equal 365. The random retrospective glances are great. For example, when it's Christmas, I don't necessarily want to be prompted to compare it to the last one...
Didn't know about that one! What an absolutely great thing. I keep a log over the work I do and being able to look back at the work I have done and examine the thoughts I had say a year ago is incredibly valuable. I wouldn't be surprised if you can get the same benefits from this.
It would be great too if in the settings, you could set a notification time for each day. For example, I could set it to ping me at 7:30pm with a notification reminding me to do an entry for the day. When I clicked on it, it would auto-load to entering the log for the day.
One feature to add might be a view for one year ago today. There are journals that have 365 pages and you write a line for each year of the highlights of the day. As you write the new year's line you end up reviewing what you were doing in previous years. It seems like you have most of the pieces to do this.