AI Grading Tool

Inspiration

K-12 teachers spend 5-10 hours every week grading papers by hand. In Vietnam and across Southeast Asia, most student work is still handwritten on paper. Teachers photograph stacks of papers, then manually enter grades into spreadsheets. We asked: what if AI could do the grading, and the teacher just reviews and approves?

What it does

This tool lets teachers photograph student papers with their phone, drag-and-drop the images into a web app, and get AI-powered grading in under 60 seconds. The results appear in an interactive grade sheet — like Google Classroom's gradebook — where teachers can review each answer, see the AI's feedback side-by-side with the original paper, edit any scores they disagree with, and export to CSV.

Key features:

Two-stage AI pipeline: A "Router" model first analyzes the assignment structure (question count, point values, grading approach), then an "Analyst" model grades each paper with those locked parameters — ensuring consistency across all students
Interactive grade sheet: Not just a CSV dump — a visual gradebook with summary statistics, sortable columns, inline editing, and expandable student detail panels showing the paper image alongside AI feedback
Multi-page support: Teachers can upload multiple pages per student and drag-and-drop to group them
Smart defaults: The AI figures out scoring, question structure, and feedback style from the paper itself — teachers just upload and click Grade
10 free papers: No signup, no credit card. Device fingerprint tracks usage for a frictionless free tier
Works with phone photos: No scanner needed. Supports JPG, PNG, PDF, and HEIC