Grade Harbor prepares rubric-aligned scores, evidence for each score, and draft feedback on student writing, then hands the decisions to the teacher. The teacher reviews what the AI has assembled, changes what is inaccurate, and decides when a grade is ready to lock. It is built for K–12 writing teachers, with secondary English and history mentioned as the main audience.

Alongside individual scores and feedback, it surfaces patterns across a class, which teachers can use to shape instruction. The platform positions the AI as an assistant rather than the final marker: nothing is graded without a teacher's approval.

Schools can start with a teacher trial or request a demo. The vendor describes its data practices as FERPA-aligned.