I am excited to assign more writing now that I can give them specific and objective feedback more quickly. I may even postpone my retirement because of your product!
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Pick a rubric from our library, or let CoGrader detect the right one from the essay.
50,000+ Teachers trust CoGrader
1,000+ Schools across all 50 states
2M+ Essays graded with AI
80% Less time grading
Used at 1000+ schools
What it does
How the AI essay checker works
CoGrader does three jobs in one pass. Grading comes first, with an AI-writing check and a grammar check layered on top.
Grade against a rubric
Scores the writing on claim, evidence, organization, and style against your rubric, then drafts timely, specific feedback you can act on. It handles argumentative, informative, narrative, and analytical essays, plus AP essays, DBQs, and LEQs.
Check for AI writing
Flags signs that an essay may have been written by AI, so you can spot the ones worth a closer look before a grade is final. No detector is perfectly accurate, so treat a flag as a reason to read closely, not as proof.
Catch grammar mistakes
Catches the spelling, grammar, and wording problems that cost easy points, in the same pass as the rubric score, so mechanics and argument come back together.
Want to dig into one job on its own? Use the AI detector for AI use, or the originality checker for copied sources.
Teachers and students use CoGrader's AI Essay Checker
The same checker works on both sides of the desk. Students get timely, specific feedback before they submit, and teachers give that same feedback to a whole class, while keeping the final say on every grade.
- Teachers give every student timely, specific feedback, with rubric-aligned scores you review and adjust.
- Students see where an essay stands and exactly what to fix before turning it in.
Checking for AI
How to Actually Check an Essay for AI
A real check combines AI-writing signals with a close read of the essay, the rubric, and the student's source use. CoGrader helps by surfacing the AI signal in the same pass as the score and feedback, so anything unusual stands out before a grade is final.
- 1 Run an AI check into CoGrader and get instant AI-writing and quality signals.
- 2 Review the rubric scores and feedback to see if the essay "fits" what you expect.
- 3 Verify and decide. If anything feels off, talk with the student or adjust the grade.
Rubric fidelity
Score essays against rubric-based grading
CoGrader checks each essay against a defined rubric, so the feedback reflects your standards, not a generic writing score.
STAAR / Texas
TXArgumentative, Informative, and Narrative rubrics for grades 6 to 12. Aligned with TEKS standards.
See STAAR rubricsCAASPP / California
CASmarter Balanced ELA performance task rubrics. Argumentative, Informative, and Narrative writing.
See CAASPP rubricsB.E.S.T. / Florida
FLFlorida Assessment writing rubrics for grades 4 to 10. Aligned to the B.E.S.T. ELA standards.
See B.E.S.T. rubricsNew York State ELA
NYProse Constructed Response rubrics. Narrative, Literary Analysis, and Research Simulation tasks.
See New York rubricsAP / College Board
APAP Lang, AP Lit, AP History DBQs and LEQs. Official College Board scoring rubrics.
See AP rubricsGrading to a specific rubric? Try our AI Essay Grader, or build your own with the AI Rubric Generator.
AI Essay Checker
for English Teachers
Give every student timely, specific feedback that helps them grow. CoGrader drafts rubric-aligned feedback and you review, adjusting to your voice.
Save up to 80% of grading time so you can spend it on teaching and students have faster turnaround on their assignments.
Reviewed by Andrew Gitner Andrew Gitner Founding Educator at CoGraderELA teacher with a decade of classroom experience. He reviewed how CoGrader maps essays to your rubric.
View profile on LinkedInUse it with your LMS
Import a set of essays, check and grade them against your rubric, and send grades back, all from inside your LMS.
Trusted by K–12 teachers nationwide
Teachers across the country use CoGrader to check essays for AI, grade against a rubric, and give every student timely, specific feedback.
I am absolutely blown away by CoGrader. It has been excellent for pre-scoring essays and providing students with comprehensive, usable feedback.
What usually takes me days (and way too many hours of off-contract time), took me mere hours. I plan on hosting a PD for my staff in the next few weeks.
Co-workers, students and I have compared results from CoGrader with a variety of other AI scoring for AP essays, and yours is BY FAR the most accurate.
Helping teachers GRADE but more importantly helping GIVE QUALITY FEEDBACK, and putting the power of great feedback into the hands of kids so they have AGENCY to improve.
Teachers will be motivated to assign more writing. It allows teachers to personalize student feedback quickly, leaving more time for targeted instruction.
I almost cried when I used it. It was as if someone handed me my weekends back on a silver platter.
THANKS. CoGrader is BY FAR the most accurate AI scoring for AP essays I have used, with the best feedback.
I am excited to assign more writing now that I can give them specific and objective feedback more quickly. I may even postpone my retirement because of your product!
I am absolutely blown away by CoGrader. It has been excellent for pre-scoring essays and providing students with comprehensive, usable feedback.
What usually takes me days (and way too many hours of off-contract time), took me mere hours. I plan on hosting a PD for my staff in the next few weeks.
Co-workers, students and I have compared results from CoGrader with a variety of other AI scoring for AP essays, and yours is BY FAR the most accurate.
Helping teachers GRADE but more importantly helping GIVE QUALITY FEEDBACK, and putting the power of great feedback into the hands of kids so they have AGENCY to improve.
Teachers will be motivated to assign more writing. It allows teachers to personalize student feedback quickly, leaving more time for targeted instruction.
I almost cried when I used it. It was as if someone handed me my weekends back on a silver platter.
THANKS. CoGrader is BY FAR the most accurate AI scoring for AP essays I have used, with the best feedback.
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Explore more CoGrader tools
Different question, different tool. Each one is built around the same rubric-based grading.
AI Detector
Check whether a submission was written by AI, with clear signals teachers can act on.
Open the AI detectorOriginality Checker
Scan essays for copied sources and check originality before you grade.
Check originalityAI Essay Grader
Grade narrative, informative, and argumentative essays against your own rubric.
Try the graderFrequently Asked Questions
Your AI essay checker questions, answered.
What does an AI essay checker do?
An AI essay checker reads an essay and reports how strong it is and what to improve. CoGrader does three jobs in one pass: it grades the essay against a rubric, checks for signs of AI-generated writing, and catches grammar mistakes, then returns a score with timely, specific feedback you can act on.
Is there a free AI essay checker?
Yes. CoGrader is free for 100 essays per month, with no credit card to start. You can check an essay against a rubric, flag possible AI writing, fix grammar, and return grades, all on the free plan.
How do I check if an essay was written by AI?
Paste or import the essay and CoGrader flags signals that it may be AI-generated. No tool can confirm AI use with certainty, because no detector is fully accurate and false positives happen, so treat any signal as a flag to review. See the AI Detector for more.
Can you use AI to grade an essay?
Yes. CoGrader grades each essay against a rubric and drafts feedback, then a person reviews and approves every grade. It does the slow first pass and never releases a grade on its own, which keeps the final call with the teacher.
How accurate is an AI essay checker?
Accuracy depends on the job. Scoring an essay against a clear rubric is reliable and consistent, which is why it works well for a first pass. Detecting whether text was AI written is not reliable for any tool, so treat an AI signal as a flag to review, not a verdict.
Does CoGrader work with Google Classroom and Canvas?
Yes. CoGrader connects to Google Classroom, Canvas, and Schoology. You import a set of essays, check and grade them against your rubric, and send grades and feedback straight back to your LMS without leaving the tools you already use.
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