An honest comparison of the open document engines considered for Sovereign, and why DOCX fidelity, inspectability, and deployment control mattered most.
Project Sovereign is editor-first, so the document engine decision starts with DOCX round-tripping, collaborative editing, and a deployment model an institution can review. The public site currently positions OnlyOffice as the engine with the strongest fit for those constraints.
The choice is not framed as a claim that one open document project wins every category. It is a product fit decision: institutional document work needs strong Microsoft Office compatibility, predictable operations, and an engine that can sit inside a governed deployment boundary.