I would like an offline dictionary app, but am having a tough time deciding which one might be most suitable! I want a serious, in-depth dictionary and don't mind paying decent money for something good. I've tried The Concise English Dictionary but it does not have the etymology, usage, IPA pronounciation and other language geek info I want! Has anyone bought the Concise OED? Does the American Heritage Dictionary include British English spellings and usage as well? Is the Collins any good? The App Store reviews and Google aren't helping me! What would you recommend???