GRID provides a deterministic spreadsheet engine that runs natively inside applications, fully compatible with Excel and Google Sheets. It enables LLM agents to read, calculate, and edit spreadsheets through simple tool calls, reducing latency and token usage. The platform includes ready-made UI surfaces like a viewer and editor, plus an Excel add-in. Built for developers, GRID integrates quickly and is rigorously tested, making it ideal for building agentic products that require reliable spreadsheet logic.