ArtCraft unveils unfinished Rust alternatives to Word, Excel and PowerPoint
ArtCraft has released early Rust applications that imitate Microsoft Word, Excel and PowerPoint, extending its open-source projects modelled on Adobe creative software. The tools rely heavily on Claude for development and are described as clean-room reimplementations, but they are unfinished and not suitable for production use.
WordCraft, tested on an Arm-based Surface, resembles Word while using different buttons and imagery. ArtCraft estimates it has 62 per cent feature parity and says an alpha for everyday writing is close, but DOCX compatibility testing has not begun and charts, SmartArt and embedded OLE objects are unsupported. The company says it used public specifications, observation and original or openly licensed assets; a lawyer said legality may vary by jurisdiction and could be contested.
- ArtCraft is building open-source office software in Rust.
- WordCraft is pre-alpha and estimated at 62 per cent feature parity.
- DOCX compatibility testing has not started.
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Microsoft Office – comprising Word for documents, Excel for spreadsheets and PowerPoint for presentations – dominates workplace productivity globally. ArtCraft, which has previously created open-source alternatives to Adobe's creative software, has now begun developing free, open-source versions of these three applications. Open-source alternatives to dominant proprietary software can offer users choice and transparency about how their tools work.
The applications are written in the Rust programming language and use Claude, an artificial intelligence assistant, to help with their development. The Word equivalent, known as WordCraft, is currently an unfinished prototype with only 62 per cent feature parity and lacks support for complex documents. The company states that an early version suitable for basic writing could arrive soon, but all three tools are nowhere near ready for serious professional or personal use.
ArtCraft claims it has built these as clean-room reimplementations using publicly available specifications, observation and original assets rather than copying Microsoft's code. However, questions remain about whether the applications can correctly read and save files in Microsoft's formats, and legal experts have noted that the approach's legality could vary by country and may face challenges. Features like charts, embedded objects and advanced formatting remain unsupported.
Both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
Advocates for open-source office alternatives argue that such projects advance user freedom and reduce dependence on proprietary software monopolies. They contend that clean-room reimplementation using public specifications represents legitimate reverse engineering, and that creating community-owned alternatives strengthens the broader software ecosystem regardless of incomplete feature sets in early releases.
The case against
Critics counter that the visual design, interface conventions, and specific implementations in Microsoft Office are likely protected by copyright and design patents, meaning clean-room methodology may not fully mitigate legal risk. They argue that substantial developer resources would be better invested in genuinely innovative productivity tools rather than attempting to replicate existing commercial offerings, particularly given the uncertainty surrounding such projects' legal standing.
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Originally published by The Register as “Rust upstart reveals ‘reimplementation’ of Microsoft Office – with Claude on coding duty”.