EssayGrader vs CoGrader:
A Fact-Checked Feature Comparison (2026)

EssayGrader publishes a criterion-level accuracy benchmark: 94% agreement with teacher scores on 22,000+ essays across 8 assessment programs, measured per rubric criterion, with a public methodology. EssayGrader's AI also met or exceeded human-to-human rater agreement (0.79 avg QWK vs 0.70). CoGrader references AP-exam-scorer testimonials but has not published a dataset, sample size, or methodology.

Yes. EssayGrader launched native Schoology integration in April 2026, available on the Pro plan ($19.99/month). CoGrader also supports Schoology, but only on the School/District tier (institutional purchase).

Yes. Teachers upload a scanned PDF of an entire class. EssayGrader splits it by student automatically and transcribes cursive and print. CoGrader also supports handwritten grading from photos or scans on its Standard plan.

Yes. EssayGrader's rubric library covers all 50 U.S. states, Common Core, AP, IB, GCSE, A-Level, Cambridge, and rubrics from Australia, Canada, New Zealand, and Singapore.

Yes. In a side-by-side district procurement (2,500 students, 50 teachers, 2026-2027 school year), EssayGrader's annual cost was $6,714 compared to CoGrader's $9,000 (with a 20% first-year discount) or $11,250 at list price. EssayGrader prices per teacher seat ($134.28/year); CoGrader prices per student ($4.50/year). From year two onward, EssayGrader is approximately 40% less expensive. EssayGrader also includes a live professional development session at no extra cost.

Both offer a free plan, no credit card required. EssayGrader gives new users 100 essays per month to start. For teachers who need more, EssayGrader's Lite plan ($6.99/mo) includes 100 essays/month plus native Google Classroom and Canvas integration. CoGrader's Canvas integration requires the Schools & Districts tier (institutional purchase).

EssayGrader follows SOC-2 aligned data practices, but is not formally SOC 2 certified. This is primarily because almost all of the Data Processing Agreements (DPAs) for K-12 schools doesn’t require SOC 2, but rather asks for NIST SP 800-53 adherence. EssayGrader adheres to NIST security practices and also publishes a security report on its Trust Center. In addition, EssayGrader has also completed HECVAT 4.1.5 (on file for higher-education procurement) and is FERPA, COPPA, and CCPA compliant. CoGrader holds SOC 2 Type 1 certification with a published third-party audit. Both tools state that student data is never used to train AI models.

Yes. EssayGrader has signed DPAs with 100+ schools across 30+ U.S. states as of July 2026. PO purchasing and W-9 documentation are available on the School/District plan.

Criterion-level accuracy means the AI's score on each individual rubric row matches the teacher's score, not just the total. A tool can get the total right while misreading which criteria earned those points. For students, the difference is between knowing they scored 14/20 and knowing their evidence is strong but their organization needs work. EssayGrader measures and publishes criterion-level agreement. CoGrader does not publish criterion-level data.

As of September 2026, CoGrader's comparison page contains several factual errors about EssayGrader, including incorrect claims about state standards ("STAAR only"), AP rubrics, Schoology integration, handwritten grading, DPA signing, and teacher review. Each correction is documented on this page with sources.