ONLYOFFICE is a Microsoft 365 / Google Docs alternative office suite (documents, spreadsheets, presentations, PDF editing, fillable forms, real-time co-authoring) operated by Ascensio System SIA, headquartered in Riga, Latvia and founded in 2009 by Lev Bannov. The product ships as a fully open-source AGPLv3 codebase plus a managed DocSpace cloud, with desktop apps (Windows, Linux, macOS), mobile apps (iOS, Android), and 40+ third-party connectors for embedding into platforms like Nextcloud, ownCloud, Confluence, and many others. Real-world EU adoption is significant: the city of Lyon, France publicly migrated to OnlyOffice in 2025 as part of its sovereign-IT strategy.
For an EU-sovereignty audit ONLYOFFICE is the most structurally complex listing in the docs-and-wikis category. The operating-and-contracting entity is Ascensio System SIA in Riga, Latvia, an EU member state company. But the corporate ownership chain has multiple non-EU layers that procurement teams must understand before signing material multi-year deals: Ascensio System SIA was originally established in 2009 as a subsidiary of the Russian-based New Communication Technologies; in August 2023 the ownership restructure transferred control to Ascensio System Limited (UK), which is in turn owned by OnlyOffice Capital Group Pte. Ltd. (Singapore); the founder and ultimate beneficial owner Lev Bannov holds Russian and Turkish dual citizenship and has resided in Istanbul, Turkey since 2023. The August 2023 restructure was specifically designed to distance the operating entity from Russian ownership and align with EU procurement norms, but the structure is still non-trivial: EU-operating, UK-holding, Singapore-master-holding, Russian-Turkish UBO.
AGPLv3 open-source means the entire codebase is auditable and self-hostable: this is the procurement-grade escape hatch. Running the open-source ONLYOFFICE Community / Document Server on EU infrastructure (Hetzner, OVHcloud, Scaleway, IONOS, STACKIT) keeps everything inside the customer's chosen jurisdiction and effectively neutralises the ownership-chain complexity for the deployment data flows. Pricing: open-source self-host free; DocSpace Cloud free Startup tier with paid Business / Enterprise tiers. Best fit: EU public-sector and government buyers (Lyon model) that self-host on EU infrastructure under AGPLv3, organisations needing Microsoft Office format compatibility with sovereign-deployment options, and any procurement-grade buyer comfortable with the complex but EU-operating ownership chain (or who self-hosts to neutralise it).