Free software programs with sentence checkers include Microsoft Word, Scientific Writing Assistant and After the Deadline, while priced programs include CorrectEnglish, WordPerfect, WhiteSmoke and Grammarly. The sentence checkers have varying success rates, as of 2015.
Comparing several types of sentence checkers, Microsoft Word has matched priced software in the grammar category, but fell behind in the style rating, as of 2015. After the Deadline was average in both sections. WhiteSmoke rated higher in grammar and average in style. A suggested tactic is using a combination of human checking, two or more software checkers and a text-to-speech software to catch the most errors.