AI-native Office that patches docx instead of rewriting them

What it does

GenOffice is a macOS and Windows office suite—word processor, spreadsheet, presentation editor, and PDF tool—built as five Electron apps around a shared TypeScript engine. The pitch is AI editing as a first-class workflow: every app embeds the same AI panel, offering block-level edits with version snapshots in docs and tool-calling agents over workbooks, slides, and PDFs. Model calls route through a Genspark account, so no API keys live on the machine.

The interesting bit

The real engineering flex is byte-preserving round-tripping. When you open a .docx, the app archives the original by hash, parses it into a block tree, and tracks dirty paragraphs. On save it regenerates OOXML fragments only for changed blocks and splices them back into the original document.xml; everything else survives byte-for-byte, so Word layout doesn’t break. The same patch philosophy applies to sheets and slides, backed by an in-house Rust sidecar for xlsx and a custom pptx render engine.

Key highlights

• docx-engine keeps original files pristine: only dirty paragraphs are rewritten, preserving untouched bytes, styles, and layout.
• Sheets layers on the open-source Univer core but swaps in a Rust xlsx sidecar (calamine + IronCalc) and in-house Konva chart rendering.
• Slides carry their own pptx parse/render/edit stack, including HarfBuzz text shaping and master slide support.
• AI is ambient, not a chat sidebar: block-granular editing in docs, agent-driven manipulation in sheets, slides, and PDFs.
• Core engine packages are pure TypeScript, Electron-agnostic, and unit-tested; the suite is Apache-2.0 licensed (minus a reserved ee/ enterprise directory).

Caveats

• AI features require a Genspark account and route through its service; there is no local model option or offline AI mode.
• Prebuilt installers are only offered for Apple Silicon macOS and Windows x64; Intel Macs and Linux are left out.
• The ee/ directory is earmarked for future proprietary enterprise modules, so long-term feature splits are likely.

Verdict

Worth a look if you build document editors or need AI that actually understands file structure instead of barfing new text into a chat box. Skip it if you want a fully offline office suite, need Linux support, or were hoping to avoid Electron.