iOS: Drafts has long been our favourite app for mobile writing. Today, a new version completely overhauls the app with a bunch of new features.
Also new in Drafts 4 is an arrange feature that allows you to move paragraphs around easily, multiple font support, a fully customisable keyboard row and version histories. Drafts 4 is also now a universal app, so you only have to buy it once for your iPad or iPhone. If you're already a Drafts user, you'll have to pay for the upgrade, but the iOS 8 specific features are worth it.
Drafts 4 ($6.49) [iTunes App Store]