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Day One Journal $1.99 (iOS)/$9.99Day One

Despite billing itself as a simple journal application, Day One is really a digital desk drawer of writing tools optimized to make writing easier for OS X and iOS users. A quick click and users are transported over to a nicely executed fullscreen UI where a calendar view with reminders aids in daily journaling, while a days list view lets writers see what they've already written. iCloud and Dropbox syncing makes updating the journal from an iPhone or iPad seamless. And just like that diary you kept under your pillow as a teen, you can lock access to your Day One journal using a password protection feature.