ONLYOFFICE vs Collabora Online
Both are free/open-source alternatives to Microsoft 365. Here's how they stack up — verified facts, no spin.
ONLYOFFICE
Open-source suite with the closest Microsoft-format fidelity and real-time co-editing.
ONLYOFFICE is an open-source office suite whose editors use Office Open XML (DOCX, XLSX, PPTX) as their native formats, which gives it some of the best fidelity with Microsoft files of any alternative here. It comes in two parts: the free ONLYOFFICE Desktop Editors, an offline app for Windows, macOS, and Linux; and ONLYOFFICE Docs (Document Server), a self-hostable engine that adds real-time co-authoring, comments, track changes, and version history in the browser. Both are AGPL-3.0 licensed. It is a strong fit for teams that want Microsoft-like documents plus self-hosted collaboration on infrastructure they control. The vendor also sells hosted cloud and enterprise editions.
Collabora Online
Self-hosted, browser-based collaborative editing built on the LibreOffice engine.
Collabora Online is a self-hostable, browser-based office suite from Collabora that brings real-time co-authoring to the LibreOffice engine, so multiple people can edit the same Writer, Calc, or Impress document at once through a web browser. The free Collabora Online Development Edition (CODE) is a rolling release aimed at home use, testing, and small teams, while the supported Collabora Online product targets organizations that need stability and vendor support. It is the natural way to add Google-Docs-style collaboration on your own server, and it is what powers Nextcloud Office (the richdocuments app) inside a Nextcloud instance. It is MPL-2.0 licensed.
Side by side
| ONLYOFFICE | Collabora Online | |
|---|---|---|
| Sovereignty Score | 97 | 95 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first | Yes | Yes |
| License | AGPL-3.0 | MPL-2.0 |
| Pricing | Free desktop apps and self-hosted Community server; paid cloud and enterprise editions available | Free self-hosted CODE edition; paid supported edition and hosting available |
ONLYOFFICE edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
ONLYOFFICE
Strengths
- +AGPL-3.0 licensed and genuinely open, for both the desktop editors and the Docs server
- +Uses DOCX/XLSX/PPTX as native formats, giving very high fidelity with Microsoft files
- +Self-hostable Docs server adds real-time co-authoring, comments, and track changes on your own infrastructure
- +Free offline desktop apps for Windows, macOS, and Linux for users who do not need collaboration
- +Actively developed with a regular release cadence and integrations for Nextcloud, ownCloud, and others
Trade-offs
- −Real-time collaboration requires running and maintaining the Docs server, which needs a capable server
- −The free self-hosted Community edition is intended for smaller deployments; heavier or enterprise use points to the paid editions
- −Some advanced features and official support sit behind the paid cloud/enterprise tiers
- −As a newer suite, it has a smaller extension ecosystem than the most established desktop suites
Collabora Online
Strengths
- +Fully open-source under MPL-2.0, an OSI-approved license
- +Real-time, in-browser co-authoring of documents, spreadsheets, and presentations on a server you control
- +Built on the mature LibreOffice engine, so format handling matches LibreOffice closely
- +Powers Nextcloud Office, giving an easy path for people already running Nextcloud
- +Supports ODF and Microsoft formats, keeping documents portable
Trade-offs
- −Requires running a server; setup and maintenance are more involved than a desktop install
- −The free CODE edition is a rolling release the vendor does not recommend for production; production use points to the paid supported edition
- −Best used alongside a file backend such as Nextcloud, rather than as a standalone suite
- −Browser-based editing depends on the server being available, so it is less 'offline-first' than a desktop app
Facts verified 2026-07-06. Licenses and pricing change — spotted something out of date? That's a correction we want.