WinProof is a major advance over other grammar checkers. It goes beyond simple grammar checking and it can actually proofread like a person and catch non-English constructions created by careless typing errors like typing "it" when you meant "is". WinProof uses a revolutionary language processing system which knows what words can be combined and flags an error when it sees an illegal combination. It also checks for spelling. The program works by proofreading text that you have copied to the clipboard. If you need an automated proofreading assistant, WinProof can help catch some embarrassing mistakes.