A good grammar checker should also feature built-in style checkers. After all, you should use different styles for different kinds of documents. For example, you would use the Modern Language Association (MLA) style for an English or Humanities class, the Associated Press (AP) style for reporting and many types of online content and The Chicago Manual of Style for most business writing. However, these styles can change frequently. Computer software, no matter how sophisticated, has a hard time keeping up to speed with these changes. We recommend purchasing reference books or subscribing to online reference databases to assist you in using these specific styles.