Try it

Grade a paper of your own.

Paste a short paper and pick a rubric. You get the first pass a teacher would review: a score per criterion, the quote it rests on (checked word for word against the paper), and any flags. Try the “Asks for full marks” sample to see a paper that talks to the grader.

This sandbox is yours alone. It doesn't touch the demo classes. What you paste is kept for 24 hours, then deleted. Paste made-up writing only, never real student work.