Every student deserves feedback that actually helps them learn.

GemmPen reads handwritten exams, scores them against your rubric, and gives each student personal feedback with exercises built from their own mistakes. And it adapts to your voice over time.

No internet. No cloud. No student data leaves the classroom.

This site is a walkthrough with prepared sample data, so you can click through the whole pipeline without downloading a model. The build that runs on your own machine lives at gemmpen-teacher.

Try the demo

Runs offline after a one-time downloadRuns on your own laptopLanguage-agnostic by designTested in English writingData stays on your deviceFree to use

How it works

01Scan

Reads handwritten exams directly - cross-outs, corrections, messy handwriting. No separate scanner, no upload.

02Evaluate

Scores like you would. Your rubric, your standards, your categories.

03Feedback

Personal exercises that make students find their own mistakes.

04It Grows With You

Want GemmPen to sound like you? Correct a few drafts, hit one button, and it adapts to your voice. Only your corrections are used - never student data. Completely optional, but powerful.

One device - even a phone. Any classroom. Every student gets feedback that meets them where they are.

What personalization actually changes

Base Model

“Your grammar needs improvement in several areas. Try to use more varied sentence structures and work on subject-verb agreement. Consider expanding your vocabulary with more precise word choices. Your arguments could be more clearly structured with better use of connectives.”

Fine-tunedFinds the pattern behind the errors

“You made the same grammar mistake four times in your text. Here is one of them:

“there isalso concerns about data privacy.”

Read it out loud. Can you hear it?

The subject is ‘concerns’ - that is plural. What verb form does a plural subject need? Once you spot this pattern, four errors in your text disappear at once.”

The difference: The base model identifies the category. The fine-tuned model finds one repeating pattern, quotes the student's own text, and asks a question instead of giving the answer. Fix one rule, fix four errors.

One model does it all: Gemma 4 reads handwriting, scores against your rubric, writes feedback, and learns your voice.