Concrete Software's Spell Checker is a competent app but it may not think fast enough to win the Great American Spelling Bee.
I prefer to use a dictionary app when I want to check the spelling of a word.
dictionary app
iPhone and iPad apps tagged "dictionary app."

Spell Checker for Quick Look-Up of Words on the Go

Spell Check is a Dictionary in Reverse
How's your spelling? That bad, huh? Download Achoom's Spell Check and you'll be okay.
There are several dictionaries in the App Store and those virtual dictionaries are exactly like the physical dictionaries, give or take a few extras that exploit the iPhone and iPod touch's unique capabilities.

word.i.pus is the Dictionary Every Scrabble or Boggle Player Needs
I need word.i.pus, from Paul Jacobs, because I cheat at Scrabble. That's the only way I can beat my wife who has Oracle Database 11g for a brain. She knows I cheat but she lets me get away with it because she also knows I won't play against her otherwise.
word.i.

When It's Time for the Perfect Rhyme, Keep this App Nearby
Are you a dietician but aspire to be a musican? When you rap do people tell you it's crap?
Then it's time for Perfect Rhyme.
AliMusic's Perfect Rhyme is a dictionary for musicans, poets and people like Muhammed Ali, who need to rhyme from time to time without making it a crime.

WordBook Gets Right to the Point of Dictionaries
Wordbook English Dictionary & Thesaurus- As someone who writes for a living, I'm totally biased about dictionaries, thesauruses, synonym finders and the like. These are the reference tools of my trade and I'm as picky about which one to use as a soon-to-be bride in a bridal shop.



