Spreadsheets and data, engineered in pure Rust.
High-performance formula calculation engine, banded tables, filter buttons, in-cell sparklines, and hardware-accelerated charts. Reads and writes .xlsx files natively with zero cloud subscription fees.
Built for Real-World Data Analysis
Rust Formula Engine
Calculates 1 million cells with SUM, VLOOKUP, INDEX/MATCH, and IFS in 42 ms using multi-threaded Rust SIMD instructions without freezing the UI.
Full Excel Parity
Open, edit, and save Microsoft Excel .xlsx files. Preserves cell formulas, number formatting, borders, fill colors, and conditional formatting rules.
GPU Charts & Sparklines
Clustered column, line, bar, area, scatter, and pie charts rendered directly via wgpu shaders with smooth pan and zoom interactions.
Smooth 120 FPS Scroll
Virtual cell grid viewport renders only visible cells on screen. Scroll through massive financial ledgers without stutter or white flashes.
100% Offline Financials
Never leak internal financial models to cloud telemetry or third-party servers. All calculation and storage stays strictly on your local disk.
MCP & Python CLI
Let Claude, Cursor, or automated python scripts synthesize data, generate summary pivot views, and populate templates over Model Context Protocol.
GridCraft vs. Microsoft Excel 365
| Feature | GridCraft (Pure Rust) | Microsoft Excel 365 |
|---|---|---|
| Cost & Licensing | Free forever (Open Source MIT/Apache) | $69.99 - $99.99 / year recurring |
| Calculation Engine | Pure Rust SIMD multi-threaded | Legacy C++ COM runtime |
| Large Sheet Performance | 1M rows in 42ms | Noticeable freeze with complex formulas |
| Cloud Privacy | 100% offline, zero telemetry | Continuous OneDrive cloud telemetry |
| Agent Protocol | Native Model Context Protocol (MCP) | Proprietary Office Scripts |