GridCraftSpreadsheets & analysis in your browser

Spreadsheets & analysis

Fast, native spreadsheets, rebuilt in pure Rust.

Overview

About GridCraft

Ribbon tabs, formula bar, 500+ calculation functions, dynamic arrays, PivotTables and charts in a native spreadsheet app that reads and writes .xlsx files.

Capabilities

Key Features

The spreadsheet workflow01

Formula bar, Name Box, sheet tabs, fill handle, colored cell references, conditional formatting, and familiar shortcuts.

Native XLSX compatibility02

Styles, themes, formulas, dynamic arrays, tables, validation, comments, sparklines and PivotTables round-trip cleanly.

500+ calculation functions03

Full dependency-graph calculation engine with dynamic arrays, spilling, LET, LAMBDA, MAP, REDUCE, and table references.

Charts & PivotTables04

Seventeen chart types with customizable formatting, plus PivotTables with filters, field lists, layouts, and date grouping.

Agent-native automation05

Every ribbon button, menu item, and formula can be driven by AI agents over an MCP server, CLI, or JSON control channel.

Privacy & Safety

Your Files Stay on Your Device

Zero File Uploads

Total financial privacy: Your tables, formulas, and confidential data are never uploaded. All processing is computed in your browser using local device memory.

Saving & Exporting

Export your workbook anytime to XLSX or CSV with File → Export. Work buffers stay in browser localStorage and are exported directly to your computer.

Workflows

Common Tasks & Solutions

Open & Calculate Large Spreadsheets

High-performance grid engine calculating formulas across hundreds of thousands of cells without lag.

Inspect & Clean CSV Data Privately

Analyze customer lists, financial models, and databases locally with zero server transmission.

Export XLSX and CSV Formats

Seamlessly round-trip your data between Excel, Google Sheets, and GridCraft.

Q&A

Frequently Asked Questions

Can I open large CSV files without my browser crashing?+

Yes. GridCraft is optimized in WebAssembly to process and virtualize large tabular datasets with high speed.

Are my financial spreadsheets sent to any server?+

Never. GridCraft processes all calculations in your local browser memory.

Specifications

Supported Import Formats

Supported Export Formats

Versionv0.7.0 ↗

LicenseApache-2.0 / MIT

Source CodeGitHub Repository ↗

Made byArtCraft ↗ (official web build, independently hosted — Plasa.app is not affiliated)

Official pagegetartcraft.com/apps/gridcraft ↗ (desktop installers & downloads)

Say thanks★ Star GridCraft on GitHub ↗ Thanks to the ArtCraft team, who write and maintain it.

Workflow Integration

Companion Creative Applications

Part of the integrated Plasa creative suite. Easily round-trip your assets across these local-first tools:

WordCraft

Word processing

A fast, open-source word processor, rebuilt in pure Rust.

DeckCraft

Presentations & slides

Fast, dynamic slide presentations, in pure Rust.

CADCraft

CAD & technical drafting

Computer-aided design and drafting, reimagined in pure Rust.