storytold/gridcraft

<p align="center"> <a href="https://getartcraft.com/"> <picture> <source media="(prefers-color-scheme: dark)" srcset="docs/brand/artcraft-logo-white.svg"> <img alt="ArtCraft" src="docs/brand/artcraft-logo.svg" width="200"> </picture> </a> </p>

<p align="center"> <img src="assets/app-icon/hicolor/256x256/apps/ai.storyteller.gridcraft.png" width="128" height="128" alt="GridCraft icon: a spreadsheet page on a green tile"> </p>

<h1 align="center">GridCraft</h1>

<p align="center"> <b>Spreadsheets and data; an open-source, high-performance modern spreadsheet application, built in pure Rust.</b> </p>

<p align="center"> A fast, open-source, clean-room take on modern spreadsheet workflows. It runs natively on macOS, Windows, Linux and BSD, and in the browser via WebAssembly.<br> <i>By the ArtCraft team.</i> </p>

<p align="center"> <img alt="Written in Rust" src="https://img.shields.io/badge/written%20in-Rust-147a40?style=flat-square&logo=rust&logoColor=white"> <img alt="Runs on macOS, Windows, Linux, BSD and the web" src="https://img.shields.io/badge/runs%20on-macOS%20%C2%B7%20Windows%20%C2%B7%20Linux%20%C2%B7%20BSD%20%C2%B7%20Web-1f9d55?style=flat-square"> <img alt="License: MIT OR Apache-2.0" src="https://img.shields.io/badge/license-MIT%20%2F%20Apache--2.0-147a40?style=flat-square"> <img alt="Agent-drivable over MCP" src="https://img.shields.io/badge/agents-MCP-1f9d55?style=flat-square"> <br> <a href="https://sonarcloud.io/project/overview?id=storytoldgridcraft"><img alt="Scanned by SonarCloud" src="https://img.shields.io/badge/Scannedby-SonarCloud-4b9fd5?style=flat-square&logo=sonarqubecloud&logoColor=white"></a> <a href="https://coderabbit.ai"><img alt="Reviewed by CodeRabbit" src="https://img.shields.io/coderabbit/prs/github/storytold/gridcraft?style=flat-square&label=Reviewed%20by%20CodeRabbit&logo=coderabbit"></a> </p>

<p align="center"> <a href="https://discord.gg/artcraft"><img alt="Join the ArtCraft community on Discord" src="https://img.shields.io/badge/Join%20us%20on%20Discord-5865F2?style=for-the-badge&logo=discord&logoColor=white" height="40"></a> </p>

<p align="center"> <a href="https://getartcraft.com/apps/gridcraft"><b>GridCraft on getartcraft.com</b></a> · <a href="https://getartcraft.com/">ArtCraft</a> · <a href="https://getartcraft.com/apps">All Crafting Apps</a> </p>

<br>

<p align="center"> <img src="docs/images/hero-sales.png" alt="GridCraft showing a quarterly sales dashboard: a styled table with banded rows, filter buttons, a totals row, data bars, arrow icons and sparklines, next to a clustered column chart and a pie chart" width="100%"> <br>_{<b>Quarterly Sales Dashboard</b>: a table with a totals row, conditional formatting, sparklines and two live charts — built entirely from GridCraft commands (<code>File → New → Sample</code>).} </p>

[!NOTE] ArtCraft is a community of artists from all walks of life. Painters, photographers, filmmakers, illustrators, designers, animators, hobbyists, and people who picked up a pencil last week. If you make things, you're one of us. Come say hi on Discord.

<p align="center"> <a href="#a-look-around">A look around</a> · <a href="#why-gridcraft">Why GridCraft</a> · <a href="#quick-start">Quick start</a> · <a href="#for-agents-mcp-cli-and-the-control-channel">For agents</a> · <a href="#architecture">Architecture</a> · <a href="#roadmap">Roadmap</a> · <a href="#the-crafting-apps">The Crafting Apps</a> · <a href="#license-and-credits">License and credits</a> </p>

A look around

<table> <tr> <td width="50%" valign="top"><img src="docs/images/budget.png" alt="A household budget with accounting number formats, red highlights for overspent categories, a green-yellow-red colour scale on the percent-used column, a totals row with a double border, and a horizontal bar chart comparing budget with actual" width="100%"><p align="center">_{<b>Formatting.</b> Accounting formats, cell styles, conditional rules and colour scales, frozen headers and a bar chart.}</p></td> <td width="50%" valign="top"><img src="docs/images/grades-formulas.png" alt="A gradebook table with averages and letter grades computed with IFS, green highlights on A grades and data bars, with the Formulas ribbon tab open showing the function library" width="100%"><p align="center">_{<b>Formulas.</b> 500+ functions, dynamic arrays, LET and LAMBDA, structured table references.}</p></td> </tr> <tr> <td width="50%" valign="top"><img src="docs/images/dark-insert.png" alt="The sales dashboard in dark mode with the Insert ribbon tab open, showing Pivot Table, Table, Pictures, Shapes, chart, sparkline, link, comment, text box and symbol buttons" width="100%"><p align="center">_{<b>Dark mode</b> and the Insert tab: tables, charts, sparklines, pictures, shapes, links and comments.}</p></td> <td width="50%" valign="top"><img src="docs/images/pivot.png" alt="A pivot table summarising revenue by region and product with a Channel report filter, grand totals and currency formatting, with the Pivot Table Fields pane open on the right showing ticked fields and the Filters, Columns, Rows and Values areas" width="100%"><p align="center">_{<b>Pivot tables.</b> Field list, filters, layouts, date grouping and show-values-as, saved to and read from XLSX.}</p></td> </tr> <tr> <td width="50%" valign="top"><img src="docs/images/format-chart.png" alt="The sales dashboard with the column chart selected: resize handles on the chart, its source data outlined in the table, the Chart Design tab open and the Format Chart Area pane on the right" width="100%"><p align="center">_{<b>Charts.</b> Seventeen chart types, Chart Design tab and a Format pane; selecting a chart outlines its source data.}</p></td> <td width="50%" valign="top"><img src="docs/images/page-break.png" alt="The household budget in Page Break Preview: the print area outlined in blue with a dashed page break, Page 1 and Page 2 watermarks, and the area outside the print range greyed out" width="100%"><p align="center">_{<b>Page Break Preview</b>, print settings, and PDF export and printing.}</p></td> </tr> </table>

Why GridCraft

• Familiar. Ribbon, formula bar, Name Box, sheet tabs, keyboard shortcuts, fill handle,

point-mode formula entry with coloured references, Format Cells, Paste Special, conditional formatting, tables, charts and more. Everything is right where you expect it.

• Compatible. XLSX is the native format: styles, themes, formulas (including dynamic arrays),

tables, conditional formats, validation, comments, hyperlinks, charts, pictures, sparklines, pivot tables and print settings round-trip. CSV and TSV too. Legacy 97-2003 .xls workbooks open with their values, formulas and number formats (formatting and objects not yet). XLSB worksheet data can be imported, using saved values instead of formulas. ODS worksheet data can be imported, using saved values instead of formulas. Static pictures can live inside cells, fitting their size and moving with the data.

• Capable. A dependency-graph calculation engine with dynamic arrays and spilling,

500+ worksheet functions plus LET, LAMBDA, MAP, REDUCE, SCAN, BYROW, BYCOL and MAKEARRAY, structured table references, a comprehensive number-format language, sort and AutoFilter, Flash Fill, data validation, outlining and subtotals.

• Fast. Copy-on-write workbooks (undo snapshots are nearly free), incremental recalculation,

and a virtualised grid that only lays out what's on screen.

• Agent-native. Every ribbon button, menu item, dialog, keystroke and mouse gesture is a

command that agents can run over a JSON control channel, an MCP server, or the CLI.

• Everywhere. One Rust codebase for desktop and the web. No subscription, no licence server,

no telemetry.

Quick start

cargo run --release -p gridcraft                              # desktop app
cargo run --release -p gridcraft -- --sample sales            # open a sample (sales, budget, grades)
cargo run --release -p gridcraft -- book.xlsx                 # open a workbook
cargo run --release -p gridcraft -- --sample sales --control 7979   # + JSON control channel
cargo xtask ci                                                 # fmt, clippy, tests, assets, layering, wasm

Choose Español under View → Interface language for Spanish formula names, decimal commas, and semicolon arguments. Workbooks, clipboard exchange, and programmatic APIs retain canonical English syntax.

Web

cd apps/gridcraft-web && trunk build --release     # → dist/web (serve it with any static server)
cd apps/gridcraft-web && trunk serve --release     # http://127.0.0.1:8771  (?sample=sales opens a sample)

You need trunk and the wasm32-unknown-unknown target. Open uses the browser's file picker (dropping files works too) and Save downloads the workbook.

Ribbon access keys

Press and release left Alt on Windows/Linux/BSD, or press F10 on any platform, then type a sequence below one key at a time. Keytips appear on the supported Home controls and menu items. On macOS, use F10 (Fn+F10 if required by your keyboard); Option remains available for entering accented characters.

| Sequence after Alt/F10 | Action | |---|---| | H A L / H A C / H A R | Align left / center / right | | H V S or legacy E S | Open Paste Special | | H O I or legacy O C A | AutoFit selected columns |

In Paste Special, T/V/F/C select formats/values/formulas/comments, and E toggles Transpose. Enter applies the selected options; Escape cancels the dialog. These letters also work with Alt held on Windows/Linux/BSD.

Escape backs out one keytip level; Alt/F10 again exits keytips. Clicking, scrolling, or switching windows cancels navigation. Access keys do not start while editing text or using another dialog. This is initial support for these Home and legacy paths; other ribbon commands and full mouse-free navigation remain to be implemented. Browsers or desktop environments may reserve Alt/F10 for their own menus.

Logs

The desktop app writes its log to standard error and to gridcraft.log in the logs folder next to its settings: ~/.config/gridcraft/logs on Linux and BSD ($XDG_CONFIG_HOME/gridcraft/logs when set), ~/Library/Application Support/GridCraft/logs on macOS and %APPDATA%\GridCraft\logs on Windows. Each start moves the previous log to gridcraft.1.log and that one to gridcraft.2.log, so the log of a run that crashed survives the next start; attach them to a bug report. A log file stops growing at 16 MiB. By default GridCraft's own crates log at info and everything else at warn; RUST_LOG replaces that with env_logger-style directives, e.g. RUST_LOG=debug or RUST_LOG=warn,gridcraft_engine=debug (a trailing * matches a prefix: gridcraft*=debug). Runs with GRIDCRAFT_NO_PREFS set (no saved settings) log to standard error only.

For agents: MCP, CLI and the control channel

claude mcp add gridcraft -- gridcraft-cli mcp                 # headless MCP server
gridcraft-cli mcp --connect 7979                               # MCP bridged to a running window
gridcraft-cli eval '=XLOOKUP("b",{"a","b"},{1,2})'             # → 2
gridcraft-cli run --sample budget --cmd 'home.bold={"range":"B4:F4"}' --out budget.xlsx
gridcraft-cli cat budget.xlsx --range B4:F15                   # aligned text table
gridcraft-cli commands --search chart                          # every command and its params

The MCP server offers tools such as read_range, write_range, set_cell, evaluate_formula, format_range, insert_chart, create_table, sort_range, filter and execute_command (which reaches every one of GridCraft's commands). The desktop app's control channel adds real pointer and keyboard input, dialogs and screenshots. See docs/mcp.md, docs/cli.md and docs/control-protocol.md.

Architecture

GridCraft is an engine-first Cargo workspace with enforced layering (cargo xtask layers). The egui frontend is a separate crate, so the UI can be swapped without touching the engine.

| Layer | Crates | |---|---| | L0 | core (addresses, values, errors, dates, input parsing) · numfmt (number format codes) | | L1 | formula (lexer, parser, printer, reference adjustment) · functions (worksheet function library) | | L2 | model (workbook, sheets, copy-on-write cells, styles, tables, charts…) · calc (dependency graph, evaluator, dynamic arrays) · xlsx (XLSX, CSV, plus XLSB and ODS data import) | | L3 | chart (toolkit-free chart layout and rendering) | | L5 | engine (session, commands, history, clipboard, fill, sort, filter, file I/O) | | L6 | ui-egui (spreadsheet UI, control channel) · mcp (MCP server) | | L7 | apps/gridcraft, apps/gridcraft-cli, apps/gridcraft-web |

• Contributor and agent rules (clean-room, asset policy, never-crash, quality gates): AGENTS.md
• Bundled assets: each one is listed with its licence in ATTRIBUTION.md
• Releases: signed macOS, Windows, Linux, BSD and web builds; see docs/releasing.md

Roadmap

GridCraft is in alpha: the core workflow works end to end, but depth, fidelity and file compatibility are still rough. It covers 89% of standard ribbon commands in our catalog (docs/parity-checklist.md) and 513 standard worksheet functions (docs/function-parity.md); this is a parity inventory, not a count of working implementations. Weighted by what spreadsheet users rely on, we estimate it is about 50% ready for real work. Next up: XLSX fidelity on real-world files, very large workbooks and multi-threaded recalc, chart depth, text in every script, and .xls import. Stage, numbers and estimates are in ROADMAP.md; the ranked work list is docs/gaps.md.

Downloads

Download GridCraft from GitHub: the latest release has every build listed below, and all releases has earlier versions and their notes. <ver> in the file names is the version number, and SHA256SUMS.txt lists a checksum for every file.

Windows

| Build | Installer | Portable | |---|---|---| | x64 (64-bit Intel/AMD) | gridcraft-<ver>-windows-x64.msi | gridcraft-<ver>-windows-x64-portable.zip | | arm64 (Snapdragon and other ARM PCs) | gridcraft-<ver>-windows-arm64.msi | gridcraft-<ver>-windows-arm64-portable.zip | | x86 (32-bit) | gridcraft-<ver>-windows-x86.msi | gridcraft-<ver>-windows-x86-portable.zip |

Installers and executables are code-signed. The MSI installer offers an optional desktop shortcut (unchecked on a new installation).

If the app doesn't open on Windows: the desktop app initializes only DirectX 12 by default. Letting wgpu also create an OpenGL instance can crash some graphics drivers (AMD's atio6axx.dll) before the window appears, so the app would flash in Task Manager and quit. WGPU_BACKEND overrides the default for troubleshooting (for example dx12 or vulkan). In PowerShell, from the folder containing the executable:

$env:WGPU_BACKEND = "vulkan"
& .\gridcraft.exe
Remove-Item Env:WGPU_BACKEND                     # restore the default for later launches

An explicit gl override can bring the driver crash back on affected systems, and vulkan can bring back a crash in some Intel UHD Graphics drivers (igvk64.dll, #120). The macOS, Linux and web backend defaults are unchanged.

If the app is slow on an older Windows PC, or DirectX 12 can't start: when DirectX 12 finds no graphics card with a driver for it, it only offers the Windows-provided software renderer, which draws every frame on the processor. In that case GridCraft uses OpenGL instead, without setting anything; if the first renderer fails to start, it tries the other one once. The log file records the choice (lines starting with graphics:). WGPU_BACKEND still overrides it (and then nothing else is tried), e.g. $env:WGPU_BACKEND = "gl" or "dx12".

DirectX 12 shaders are compiled with FXC, which is part of Windows, so no dxcompiler.dll or dxil.dll is needed, and a copy another program put on PATH can no longer stop the app at start ("Parent device is lost", #339). $env:WGPU_DX12_COMPILER = "dxc" (or "auto") selects wgpu's DXC handling again for troubleshooting.

macOS

| Build | File | Notes | |---|---|---| | App, universal (Apple silicon + Intel) | gridcraft-<ver>-macos-universal.dmg | Signed and notarized | | Command-line tool, universal | gridcraft-cli-<ver>-macos-universal.zip | Signed and notarized |

Linux

| Format | x86_64 | aarch64 (ARM64) | Notes | |---|---|---|---| | AppImage | gridcraft-<ver>-linux-x86_64.AppImage | gridcraft-<ver>-linux-aarch64.AppImage | Runs anywhere; updates itself with AppImageUpdate (.zsync files) | | Flatpak | gridcraft-<ver>-linux-x86_64.flatpak | gridcraft-<ver>-linux-aarch64.flatpak | Sandboxed; flatpak install --user <file> | | Debian/Ubuntu | gridcraft-<ver>-linux-x86_64.deb | gridcraft-<ver>-linux-aarch64.deb | | | Fedora/RHEL/openSUSE | gridcraft-<ver>-linux-x86_64.rpm | gridcraft-<ver>-linux-aarch64.rpm | | | Tarball | gridcraft-<ver>-linux-x86_64.tar.gz | gridcraft-<ver>-linux-aarch64.tar.gz | Unpack anywhere |

FreeBSD

| Build | File | |---|---| | x86_64 | gridcraft-<ver>-freebsd-x86_64.tar.gz |

Web (WebAssembly)

| Build | File | Notes | |---|---|---| | Static site | gridcraft-web-<ver>.zip | Runs in a modern browser; host it on any static server |

The Crafting Apps

GridCraft is one of the Crafting Apps: free, open-source creative tools from the ArtCraft team, each written from scratch in Rust and each able to stand on its own.

| | App | What it's for | Code | Learn more | |:-:|---|---|---|---| | <img src="https://raw.githubusercontent.com/storytold/photocraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.photocraft.png" alt="" width="32" height="32"> | PhotoCraft | Image editing: layers, masks, type and real PSD files | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/vectorcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.vectorcraft.png" alt="" width="32" height="32"> | VectorCraft | Vector illustration | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/filmcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.filmcraft.png" alt="" width="32" height="32"> | FilmCraft | Video editing, color and sound | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/lightcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.lightcraft.png" alt="" width="32" height="32"> | LightCraft | Photo library and raw development | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/pdfcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.pdfcraft.png" alt="" width="32" height="32"> | PdfCraft | Reading, organizing and protecting PDFs | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/effectcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.effectcraft.png" alt="" width="32" height="32"> | EffectCraft | Motion graphics and visual effects | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/designcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.designcraft.png" alt="" width="32" height="32"> | DesignCraft | Page layout and publishing | GitHub | Website | | <img src="https://raw.githubusercontent.com/storytold/gridcraft/main/assets/app-icon/hicolor/64x64/apps/ai.storyteller.gridcraft.png" alt="" width="32" height="32"> | GridCraft | Spreadsheets and data · you are here | GitHub | Website |

And **ArtCraft** itself, our AI image and video studio for artists who want real control.

<br>

<p align="center"> <a href="https://discord.gg/artcraft"><img alt="Join the ArtCraft community on Discord" src="https://img.shields.io/badge/Join%20us%20on%20Discord-5865F2?style=for-the-badge&logo=discord&logoColor=white" height="40"></a> </p>

<h3 align="center">Come make things with us</h3>

<p align="center"> Our Discord is where artists of every kind hang out: people who paint, shoot, draw, cut film, set type, and people still figuring out what they like to make. Share what you're working on, ask for help, tell us what's broken, or tell us what you wish these tools could do. Whatever your medium and however long you've been at it, you're welcome here. </p>

<p align="center"> <a href="https://discord.gg/artcraft"><b>discord.gg/artcraft</b></a> · <a href="https://getartcraft.com/">getartcraft.com</a> · <a href="https://getartcraft.com/apps">The Crafting Apps</a> · <a href="https://getartcraft.com/apps/gridcraft">GridCraft</a> </p>

License and credits

GridCraft is dual-licensed under MIT or Apache-2.0, at your option. Copyright (c) 2026 ArtCraft Team and the GridCraft contributors. Required notices are in NOTICE.

Bundled fonts, icons, images and other assets keep their own open licenses; each one is listed with its author, source and license in ATTRIBUTION.md.

All UI icons are drawn in code and are original; the sample workbooks and every screenshot in this README were made with GridCraft itself. GridCraft bundles no fonts: it uses the fonts installed on your system.

The ArtCraft name, wordmark and logos in docs/brand/ are trademarks of the ArtCraft Team and are not covered by this license. They may be used only unmodified, and only as part of this repository and GridCraft, under docs/brand/LICENSE-brand.txt. Forks and modified versions must remove them.

<br>

<p align="center"> <a href="https://getartcraft.com/"><img alt="ArtCraft" src="docs/brand/artcraft-mark.svg" width="28"></a><br> _{Made by the <a href="https://getartcraft.com/">ArtCraft</a> team and community.} </p>