Live in your browser · offline, no install
Write in the book. Watch the pen think.
Your mouse is the pen. Write one letter or symbol on the paper page; the sensors fire, the packets stream over BLE, and the AI engine on the dark page rebuilds and recognises what you wrote.
This page is a simulation, built so you can see the idea. The recognition here is a small demonstration matcher, not Vahini's real AI engine, so you may sometimes see a wrong or missed guess. The real engine works from 208 Hz dual-IMU motion captured by the pen itself, not from mouse position.
See it in action
Write one character and watch the pen's sensors fire, packetise & stream.
Demo tip: this offline matcher only knows the shapes below — O, S, V, Z, 7, a star or a heart. It's a simplified stand-in for the real AI engine, not full handwriting recognition.
motion meaning
What you just did is what the pen does. The real Vahini pen feels true pressure, tilt and pen-lifts through two IMU sensors, streams them at 208 Hz over BLE, and the AI rebuilds the writing from motion alone. Your mouse gives it only position, the pen gives it everything. Everything on this page runs as a simulation in your browser; the production engine, its accuracy and its scripts live in the analyser.