Keeping a journal can be two things: work or reward. It’s work while you’re busy writing a re-run of the day. After all the experience is still fresh and probably not very interesting.
However after 1 month it becomes fun to read old entries, after 6 months its exciting to read old entries and after a year it’s pure pleasure. Also it provides interesting insights into parts and developments in your life you didn’t know existed.
That’s one of many reasons to keep a journal: Importance of keeping a journal
A good app for the iPhone and iPad is: one day. It’s good thanks to its minimalistic approach and syncing abilities over dropbox. For the full review head on over to: Day one app review