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SmartINK is a multimodal, AI-powered infinite canvas that transforms static digital ink into an interactive computational workspace. Unlike conventional note-taking applications, SmartINK enables users to write, calculate, simulate, visualize, and interact with information directly on a single continuous canvas, eliminating the need to switch between multiple tools. At its core is CalcInk, a custom living-math engine that combines geometric handwriting recognition, an on-device digit recognition model, and symbolic computation. Handwritten expressions are recognized and solved in real time, with step-by-step derivations and interactive function plots appearing directly alongside the original ink. These core capabilities run locally without requiring cloud connectivity. SmartINK goes beyond mathematical computation through its multimodal interaction architecture, powered by specialized Meta AI models. Its context-aware copilot interprets selected canvas regions, explores multiple mathematical reasoning paths, generates structured explanations, and converts abstract concepts into visual representations. Voice recognition enables users to control the workspace and interact with computational content through natural speech. The platform also introduces a Physics Simulation Studio, allowing users to generate interactive simulations of phenomena such as projectile motion under different gravitational conditions, with adjustable parameters and real-time visualization. A multilingual Document Studio enables PDF interaction, translation, and synchronized voice-based reading, while dynamic fluid brushes and a multi-page notebook system provide a flexible creative environment. SmartINK uses task-specific model routing through Meta's AI ecosystem, supported by an offline-first architecture and multi-level fallback mechanisms. Its engineering foundation includes 336 passing automated tests across 32 test files and a clean TypeScript build. Our long-term vision extends beyond conventional screens. SmartINK could evolve into a spatial computing platform through future integration with Meta AI glasses and augmented reality technologies, enabling users to interact with mathematical expressions, scientific simulations, and digital information within their physical surroundings using voice, gestures, and visual context. Rather than building another AI chatbot, we are developing a new interaction paradigm where handwritten information becomes executable, visualizations become interactive, and AI becomes part of the workspace itself. SmartINK represents a step toward the future of human-computer interaction — where the boundary between writing, computing, and exploring ideas begins to disappear.