Another good option is EssayGrader, which offers AI-powered grading help. It'll flag grammar, punctuation and style problems, but also offers custom rubrics, bulk uploads and an AI detector. EssayGrader also can handle multilingual text and offers several pricing options, including a basic free plan, a Lite plan at $8.99/month and a Premium plan at $49.99/month for heavier use.
If you want a more streamlined grading service, CoGrader integrates with Google Classroom and other services like Canvas and Schoology. It uses AI to give immediate feedback and grades based on rubrics instructors set, a design that's designed to save time and ensure grading is fair and consistent. CoGrader offers several pricing levels, including a free plan, an Individual Educator plan at $15/month and a Schools plan at $150/year.