About OnRubric.

What it is

OnRubric is a rubric checker for students. You paste a paper and the assignment rubric. For every criterion it predicts a score range, quotes the sentences behind the estimate and names what is missing. Then it suggests three revision priorities, ranked by estimated point impact, and checks your APA 7 references. After you revise, a recheck shows how the estimate for each criterion moved.

What it does not do

It does not give grades, and it does not write or rewrite your paper. Each suggested fix says where and what to change; an example, when there is one, is cut to one sentence. OnRubric is not affiliated with any university, learning platform or other rubric tool.

How the estimate is made

Your text and rubric are sent to a language-model API (currently OpenAI), which estimates each criterion and quotes the evidence it used. The totals, the minimum width of every range and the APA 7 reference checks are computed by our own code; DOIs from your reference list are looked up at CrossRef to check that they exist.

How it was tested

Before launch we ran it on 68 essays that people had already scored with a rubric. The estimate missed the real score by 11 % of the maximum on average, and a guess that ignores the essay came close to that. The details, the comparison and the limits are on How we measured the error.

Your paper

It is kept 30 days so the report link works and you can recheck your next draft, then deleted. It is never used to train models. The Privacy page lists everything we keep.

The rubric library

The library rubrics were written for this site in our own words. They describe common college assignments; none of them is a university’s official rubric. When your course has its own rubric and allows you to upload it, check against that one.

Independence

OnRubric is an independent project, launched in October 2026 and free during the beta.