Optical Computer Vision & AI Grading

The science of high-speed exam grading.

Eliminate late-night grading sessions with red ink and answer keys. Scan 50 multiple-choice sheets in under 2 minutes using your smartphone camera, with 99.8% optical accuracy powered by Corrigi.

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1.2s Per answer sheet

99.8% Recognition accuracy

$0 No dedicated hardware needed

OPTICAL RECOGNITION LIVE

BATCH #1042

Midterm Assessment — Section 4B

Student: Liam Miller | Version B

A B C D E

9.8

Grading Complete

9 of 10 correct • Speed: 0.8s

Open in Corrigi

Engineering Pedagogy

Engineered for the relentless pace of teaching.

Every element of Corrigi is designed to eliminate clerical friction and return personal time to educators.

Smart Anti-Cheating with Unified QR Codes

Generate multiple versions (A, B, C, D) with shuffled question and choice orders. When grading, you do not need to separate the tests into stacks: the QR code instantly tells Corrigi which key applies to each student.

Zero Special Hardware

No $3,000 optical scanners or proprietary paper forms. Use standard office paper and any iOS or Android phone camera.

Class Item-Analysis Heatmap

Instantly identify which question caused the most confusion across the class. Spot misconceptions before your next lecture.

Direct Export to Excel, CSV & Gradebooks

Never retype grades row-by-row into your school portal. Export clean spreadsheets ready for Canvas, Google Classroom, Blackboard or local school systems with one click.

Direct Comparison

The real cost of manual grading.

See the side-by-side difference between analog checking and Corrigi automation.

Dimension

Traditional Grading

DrMarkit + Corrigi

Grading time (100 students)

3 to 5 hours of continuous checking

Under 2 minutes with phone camera

Human error risk

High (accumulated eye fatigue)

Virtually zero (optical validation)

Shuffled exam versions

Laborious sorting into separate piles

Automatic version detection via QR Code

Grade recording

Manual transcription into spreadsheets

Instant CSV / Excel gradebook export

Equipment required

Scantron machines or red ballpoint pens

Any standard printer & smartphone

Frequently Asked Questions

Clear answers for educators.

Do I need special printers or proprietary paper?

No. Corrigi generates standard PDF files that print on ordinary Letter or A4 paper using any office inkjet or laser printer. You can also print two test sheets per page to cut paper consumption in half.

What if a student fills bubbles with pencil or writes outside the circle?

The computer vision algorithm measures pixel density and contrast. It works reliably with dark graphite pencils, blue ballpoint pens, and black ink. If a bubble has an ambiguous smudge, Corrigi flags it on-screen for a quick one-tap verification.

How does anti-cheating scrambling work?

You can generate up to 4 versions of the same exam with questions and answer options randomized. Each page contains a unique encrypted QR Code header. When you snap the camera, the app identifies the version and grades against the correct key automatically.

Can I use Corrigi on both iPhone, Android and the Web?

Yes. Corrigi has native mobile apps available on the Apple App Store and Google Play Store for camera scanning, as well as a full-featured web app for creating and formatting exams on your desktop computer.