Can you recommend an editor for both iOS and Mac OS X designed for writers?

Solution 1:

WriteRoom for OSX and WriteRoom for iOS

Only 1.2 MB in size. (Mac version) The iOS version works on both the iPad and iPhone.

• Fullscreen
• Autosave
• Reading time, word counter
• sync via Dropbox
• supports TextExpander Touch

Solution 2:

iA Writer for OSX and iA Writer for iOS

Only 0.7 MB in size. (Mac version) The iOS version is iPad only.

• Fullscreen
• Autosave
• Reading time, word and character counter
• sync via Dropbox or iCloud
• supports TextExpander Touch

Solution 3:

Scrivener for OSX.

Plan is to build an iPad/iTouch app. Developed by a writer who couldn't find an app to meet his needs. Check out his website for more information.

• Fullscreen
• Corkboard
• Outlining
• Snapshots
• Scriptwriting (including export tool for Final Draft)
• Text synchronizes with a number of iPhone and iPad file-sharing tools
• Allows you to write in various formats (ePub, PDF, Final Draft, RTF, etc.)