Aspen Software of Albuquerque, NM, released the earliest version of a diction and style checker for personal computers, Grammatik, in 1981.
Grammatik was the first grammar checking program developed for home computer systems.
It was enhanced and developed by Reference Software and acquired by WordPerfect Corporation in 1993. Novell later acquired WordPerfect, which it then sold to Corel. U.S. government versions checked for usage according to the Government Printing Office and other military and civilian guides. The functionality of Grammatik remained in Corel's WordPerfect office suite. See grammar checker.