Today we're publicly launching Pennpaper, an AI-powered math tutor that teaches through synchronized voice explanation and visual drawing.

The Problem We're Solving

Consider how the best math teachers work. They don't just tell you the answer—they draw on the board while explaining their thinking. The diagram builds as the explanation unfolds. You can see the relationships taking shape.

Now consider how most students actually learn math: reading static textbook pages, watching pre-recorded videos they can't interact with, or sitting in classrooms of 30+ students where individual questions are impossible.

The gap between these experiences is enormous. Research shows one-on-one tutoring produces learning gains of two standard deviations above conventional instruction (Bloom, 1984). The tutored student outperforms 98% of classroom-taught students.

But tutoring costs money—often $50-100 per hour. For most families, sustained tutoring support isn't financially realistic.

What Pennpaper Does

Pennpaper is an AI tutor that:

Speaks while drawing. As our AI explains a concept, it simultaneously draws on a shared canvas. You see equations being written, graphs being plotted, diagrams taking shape—all synchronized with the explanation.

Adapts to your pace. The AI tracks your understanding and adjusts. Need more time on fractions? You get it. Ready to move faster through material you grasp? That's fine too.

Answers questions immediately. Confused? Just ask. The AI will re-explain using different words, try a new visual representation, or back up to prerequisite concepts if needed.

Never judges or loses patience. You can ask the same question five times. You can reveal that you don't understand something "basic." The AI's job is to help you learn, not to evaluate you.

How It Works

When you start a session, you tell Pennpaper what you want to work on—a specific homework problem, a concept you're struggling with, or a topic you want to learn.

The AI assesses where you are and begins teaching. You see a canvas on your screen, and you hear the AI's voice. As it explains, it draws—just like watching a teacher at a whiteboard, except this teacher is fully focused on you.

You can interrupt at any time. Ask questions, request different explanations, or say you need to see something again. The AI responds immediately, adapting its approach based on your needs.

Our Approach to Pricing

We've chosen a credit-based model rather than subscriptions. You purchase credits and use them when you need help:

Voice sessions: 1 credit—AI explanation with real-time drawing Avatar sessions: 5 credits—A video avatar tutor for a more personal experience

This means you pay for what you use. If you need intensive help before an exam, you can use more. If you're doing fine for a few weeks, you're not paying for unused subscription time.

Our target cost per voice session is approximately $0.40. Quality tutoring for less than a cup of coffee.

Who This Is For

Students who want help understanding math, not just getting answers. From arithmetic through calculus, Pennpaper explains concepts visually and adapts to how you learn.

Parents looking for affordable tutoring support. Our parent dashboard lets you track what your child is working on and how they're progressing, without doing the work yourself.

Adults returning to math for career advancement, standardized tests, or personal interest. No embarrassment about asking "basic" questions—the AI exists to help you learn.

What's Next

We're launching with coverage of K-12 mathematics, with particular depth in algebra, geometry, and early calculus. Our roadmap includes:

Expanded topic coverage based on user demand
Photo problem solving (take a picture of a problem, get help)
Practice problem generation with adaptive difficulty
Integration with school curricula

Try It

We're offering new users free credits to experience Pennpaper. Start a session, ask about a concept you've always found confusing, and see what it feels like to have patient, visual math instruction available whenever you need it.

The 2 sigma problem—the gap between what's possible with individual tutoring and what most students actually experience—doesn't have to persist. Technology has caught up to the vision. Quality math instruction, for every student who needs it, is finally within reach.

Welcome to Pennpaper.

Brian Mwangi, Founder

Introducing Pennpaper