About AI Essay Grader

Students revise better when they know what is wrong with a draft and what to fix first. AI Essay Grader scores an essay on five criteria for its type and grade level, quotes the lines that need work and gives a revision plan, usually within a couple of minutes.

Gradings are produced by Claude Sonnet 5, made by Anthropic, through a commercial model API, following our grading instructions and the rubric published on the essay rubric page. The instructions tell the model to quote the essay, to grade candidly, not to invent facts about sources, and never to write the essay.

A score is an AI estimate against a general rubric, not an official grade or a prediction of an admission decision. It can differ from a teacher's grade, and the same essay can score a few points differently on another run. We have not measured agreement with teachers, so we do not publish accuracy figures. The grader does not detect AI writing or plagiarism.

The grader gives feedback; it does not write, finish or rewrite essays, and its example fixes cover one sentence at most. Follow the rules of your school or application about getting help with your writing.

Grading costs 1 purchased credit per word with a 300-credit minimum, shown before you start: $0.20 to $0.50 for a 1,000-word essay. Registration is free and comes with no signup credits. Packs start at $4.99; Stripe processes payments and failed gradings are refunded automatically.

Essays and reports are stored to show your history and are sent to the model provider only to produce your report. We do not sell your essays or use them to train models. You can ask us to delete your account and its history.

For questions about your account, billing, refunds or data deletion, write to us from the email address on your AI Essay Grader account.