Grammarly Premium This link opens in a new windowGrammarly is a digital writing-support tool that provides grammar, spelling, and plagiarism checking. It integrates conveniently into web browsers (so it can be used in Canvas), Google Docs, office productivity software for the PC, and mobile devices. All ISU students and faculty have free access to the premium version of Grammarly through a pilot program funded by CASTLE and supported by the Department of English.