このエピソードについて
After drawing attention earlier in October for using AI to build open-source alternatives to seven Adobe applications in Rust, developer Brandon Thomas and the ArtCraft project have moved into Microsoft Office territory with three new projects: WordCraft, GridCraft, and DeckCraft.
WordCraft targets Word, with a familiar ribbon, styles, tables, track changes, references, and mail merge, reading and writing Word documents and exporting to PDF, OpenDocument, rich text, Markdown, and plain text. GridCraft targets Excel, supporting spreadsheet formulas, dynamic arrays, tables, charts, conditional formatting, and PivotTables, opening and saving Excel workbooks as a native app or in a browser. DeckCraft targets PowerPoint, supporting slide decks with themes, layouts, shapes, images, tables, charts, transitions, and animations, with the ability to open and save PowerPoint files. All three are written in Rust, open source under permissive licenses, and described by their own repositories as clean-room reimplementations built from scratch rather than from Microsoft's proprietary code.
Thomas says he used Anthropic's Claude Opus 5.5 to help build the earlier Adobe-style apps, and the Office-style projects follow the same approach: AI coding agents work across the codebase, implement features, write tests, and fix problems while Thomas directs the work and checks the results. Each app also exposes its actions as commands through a command-line interface and an MCP, or Model Context Protocol, server, letting an AI agent ask the app to do something, such as generating a spreadsheet or formatting a document, and then inspect the result.
The episode is direct about where things stand: all three remain in alpha, and their own public roadmaps describe clear gaps between covering a feature by name and matching Microsoft Office in professional work, since a spreadsheet can implement hundreds of functions and still behave differently on a complex financial model. Building a clone doesn't mean the original has been replaced; feature coverage, compatibility, and stability are what will decide that. The episode's bigger point is about the shifting economics of rebuilding mature software: what used to require a large engineering team and years of work can now be attempted by a small team directing AI agents, even as the hardest remaining work moves toward architecture, testing, and judging whether the result is dependable enough to use.
Sources & References
Thurrott: Open Source AI Dev is Going After Microsoft Office, Too — https://www.thurrott.com/office/342646/open-source-ai-dev-is-going-after-microsoft-office-too
WordCraft: GitHub repository, clean-room reimplementation of Microsoft Word in Rust — https://github.com/storytold/wordcraft
GridCraft: GitHub repository, clean-room spreadsheet/Excel-style app in Rust — https://github.com/storytold/gridcraft
DeckCraft: GitHub repository, clean-room reimplementation of Microsoft PowerPoint in Rust — https://github.com/storytold/deckcraft
Flowtivity: Someone Rebuilt Adobe in Rust with AI Agents. Is It Usable? — https://flowtivity.ai/blog/adobe-rust-cleanroom-clones/
Ars Technica: "Software is over": Bold AI developer takes aim at Adobe with open source clones — https://arstechnica.com/ai/2026/10/software-is-over-bold-ai-developer-takes-aim-at-adobe-with-open-source-clones/
Voice narration is AI-generated.
