Write directly on PDFs
Import a textbook PDF, then write and solve problems on an iPad.
Students can leave their working directly on the material.
Actual app screenshots coming soon
Prototype in testing
From the way you learned, to solving it yourself.
We are developing an AI math tutor that connects handwriting, feedback and learning records, with explanations that follow the way each student was taught.
A math learning app for elementary through high school
From the first explanation to working through it yourself.
Our aim is to connect the structured explanations of video lessons, the interaction of AI tutoring and the individual guidance of private tutoring. We are working toward a learning experience that uses a consistent teaching approach across lessons, explanations and hints.
What we have built so far
Our prototype is being tested with a small group of users. Its current features connect handwriting, teacher feedback, grading and learning records.
Two-way live feedback
Teachers can view student handwriting in real time in the management app.
Handwritten feedback added by a teacher appears in the student app in real time, too.
Actual app screenshots coming soon
Grading and learning records
A local LLM on our own server automatically grades answers and solution steps.
Learning records include time spent solving problems. Automated grades need teacher review; their accuracy is not guaranteed.
Actual app screenshots coming soon
Planned development
Consistent explanations. Independent problem solving.
We want the methods taught in lessons to carry through to worksheets, workbooks and hints when needed. Our planned flow offers step-by-step help when a student asks, supporting them as they work toward solving a problem on their own.
Lessons
AI lessons aligned with our teaching approach
Worksheets & workbooks
Put what was taught into practice
Hints when needed
Step-by-step help when a student asks
Independent problem solving
Support students in working it out themselves
This flow is a development plan. The full AI tutoring experience is not yet complete, and its learning outcomes have not been validated.
What exists. What comes next.
Here is the scope of the implemented prototype, alongside the features we plan to develop.
Implemented
A prototype in testing
- Textbook PDF import and handwriting on iPad
- Live viewing of student handwriting in the teacher management app
- Live delivery of teacher handwriting feedback to the student app
- Automated grading of answers and solution steps with a local LLM on our own server
- Learning records, including time spent solving problems
Current automated grading uses a local LLM on our own server. It is separate from our planned Claude API tutoring. We do not guarantee grading accuracy or that it can be used without teacher review.
Planned development
The learning experience we aim to connect
- AI lessons aligned with our teaching approach
- A learning flow connected to worksheets and workbooks
- Step-by-step hints when a student asks for help
- AI tutoring built with the Claude API
- An app for parents (not yet built)
The management app used by staff and teachers is an internal operations tool. It is not a collaboration service offered for external sale.
Turning math teaching experience into a product, in Busan.
Coupdetat Math is a three-person team in Busan, South Korea, bringing math education experience into a product. The project began in May 2026 and is still in development, before business registration.
- Based in
- Busan, South Korea
- Project started
- May 2026
- Current stage
- Before business registration · Prototype in testing
Have a question about the product?
Email us with questions about the product and our development plans.