This is a cross-platform handwritten note-taking app optimized for low-cost devices, aiming to deliver an iPad-like writing experience on old tablets. It supports pressure-sensitive writing, multi-layers, PDF annotation, and handwritten OCR, and is compatible with Windows, macOS, Linux, Android, and iPadOS. The author aims to make paperless learning accessible to the public and breathe new life into those old devices that have been neglected in corners