Grammarly.com/edu includes both the expected grammar checks and also a plagiarism scan. Our institution uses this as our plagiarism scan in order to encourage students to use their access to the grammar check as well.
The main grammarly.com/edu page references LMS integrations. This is important, because instructors need to check more than their own writing. However, the only apps are for integrating with windows, the browser and microsoft word. That is great for getting students to check their own writing, but I need to check submissions from my students for plagiarism.
Our institution subscribes for all students to have access to grammarly@edu, and so setting up student accounts should not be a problem. However, the results of their scans need to be displayed in instructor accounts. The current solution is to download all submissions and then manually upload into the instructors grammarly@edu account, and then download the report to attach to feedback for the student. Aside from being cumbersome, this work-around does not adequately encourage students to use the tool we've subscribed to pro-actively. Also, attachments to instructor feedback are not as obvious to students as they should be. (In fact, when I tested with a test student, instructor attachments were not visible at all in the new gradebook, but fixing that is a separate idea...)
Ideally, the instructor would be able to set the scan settings for that assignment across the entire class, and those settings would include an option to compare to a library of past submissions. In order to submit, students would be required to check a box at the time of each submission acknowledging the grammarly scan for grammar and plagiarism. Then scores for plagiarism and grammar would display in the instructor's view of the gradebook after an automatic scan. The instructor should have access to open the detailed reports from within canvas, and be able to "dismiss" a flagged phrase (a normal feature of the grammarly reports). Instructors do not need access to edit the student submissions (although editting uploaded writing samples is a normal function within grammarly@edu). Once the instructor enters a grade in canvas the detailed grammarly scores and report should be "published" for the student to see alongside their grades (without access to dismiss flagged phrases in the report or otherwise change the report.) None of this should interfere with a student's ability to submit their writing directly to grammarly and work proactively on improving their writing.