OnlyOffice is an open-source office suite developed by Ascensio System and distributed under the AGPL 3.0 license. It is widely regarded as the best Microsoft Office–compatible alternative on the market because it natively supports the .docx, .xlsx, and .pptx formats with very high formatting fidelity. The product family includes ONLYOFFICE Docs (the core editors), ONLYOFFICE DocSpace (collaborative document rooms), ONLYOFFICE Workspace (full collaboration platform with mail, CRM, projects, and calendar), and free desktop and mobile apps for Windows, macOS, Linux, iOS, and Android.
Real-time collaboration with Fast and Strict modes, AI-powered writing tools, fillable forms, e-book editing, PDF tools, and built-in audio and video calls inside the editor make OnlyOffice a serious productivity option for teams that need full Office compatibility without paying Microsoft 365 prices. Pricing ranges from a free Startup tier on DocSpace cloud through $20/admin/month Business plans up to $6,550 lifetime self-hosted licences for enterprises that need full data control.
OnlyOffice opens, edits, and saves .docx, .xlsx, and .pptx natively with the highest formatting fidelity of any open-source office suite — most documents survive a round-trip with no layout damage.
Source code is fully open and available on GitHub. The free desktop and mobile editors are free forever, and the self-hosted Community Edition can be deployed without any licence cost.
Co-edit documents, spreadsheets, and presentations with teammates in real time using Fast or Strict mode, with comments, track changes, version history, and live cursors.
Jump from comments and chat directly into a built-in audio or video call without leaving the document — useful for live review and editing sessions.
AI assistant generates text, images, and code, performs grammar and spelling checks, rewrites text, translates between languages, and summarises long documents.
Create interactive fillable forms (DOCXF / OFORM), edit PDFs, fill PDF forms, sign documents, and convert between formats — all from the same suite.
Choose between ONLYOFFICE Docs Cloud (SaaS), DocSpace (collaborative rooms), Workspace (full platform), or self-hosted on your own infrastructure for complete data control.
Native apps for Windows, macOS, Linux, iOS, Android, plus integrations for Nextcloud, ownCloud, Seafile, Confluence, Jira, Moodle, WordPress, and many more.
OnlyOffice gives you a full Office-class productivity suite: Document Editor (Word-compatible), Spreadsheet Editor (Excel-compatible), Presentation Editor (PowerPoint-compatible), PDF Editor, Form Editor (DOCXF / OFORM), e-book editor, real-time co-editing with Fast and Strict modes, comments, track changes, version history, in-document chat, audio and video calls, AI assistant for text/image/code generation, plus tools for translation, summarisation, and rewriting. Higher tiers and Workspace add a full collaboration platform with mail, CRM, projects, calendar, and document management. Self-hosted versions give you complete data control with on-premises deployment.
To help you decide whether OnlyOffice is the right Microsoft Office alternative for you, we have curated four hand-picked YouTube videos covering hands-on reviews, full feature walkthroughs, and 2025/2026 explainer videos. These videos walk you through downloading the desktop app, opening Word and Excel files, real-time collaboration, and using the new AI tools.
OnlyOffice offers DocSpace (collaborative document rooms) and Workspace (full office suite). DocSpace has a free tier for 3 admins (unlimited users, 12 rooms, 2GB storage) and Business at $30/admin/month (250GB/admin). Docs Enterprise Cloud is $8/user/month. On-premise: DocSpace $6,550/server, Docs Enterprise $1,500. Workspace pricing $2,200-$4,450/server for 50 users with 30-day free trial. Free for nonprofits and schools.
OnlyOffice has a complex pricing model because it spans free desktop apps, cloud SaaS, collaborative DocSpace, full Workspace, and self-hosted enterprise editions. Below are the typical 2026 public prices for the most-asked-about tiers.
Native desktop apps for Windows, macOS, and Linux, plus mobile apps for iOS and Android. Full document, spreadsheet, presentation, and PDF editing — completely free for personal use, forever.
Free Startup tier with unlimited users and guests for small teams. Business tier charges only for admins at $20/admin/month — a unique pricing model where collaborators are free.
Cloud-hosted collaborative document editing with real-time co-editing, version history, and integration with most major file storage platforms.
Full collaboration suite with editors, mail, CRM, projects, calendar, and document management. Note: Workspace Cloud is being phased out in favour of self-hosted and DocSpace.
Commercial self-hosted licence with one year of updates and support. Scales by number of concurrent connections; perpetual licence so you own the software.
Self-hosted DocSpace with one year of support and updates included. Best for enterprises that need full data control and on-premises deployment.
OnlyOffice rates around 4.5/5 on G2 and 4.5/5 on Software Advice, with users consistently praising Microsoft Office compatibility, the open-source model, and the value of the free desktop apps. Critical reviews most often focus on customer support quality and the complexity of choosing between Docs, DocSpace, and Workspace SKUs. For teams looking for a serious Microsoft 365 alternative — especially with self-hosted requirements — OnlyOffice remains one of the most-recommended options in 2026.
OnlyOffice is the only free Microsoft Office alternative I have used that opens complex .docx and .xlsx files without breaking the layout. We deployed the self-hosted Community edition for a 35-person team and the integration with Nextcloud has been flawless. AI assistant additions in 2025 are a real bonus for the price.
Source: paraphrased from public G2 review — https://www.g2.com/products/onlyoffice-workspace/reviews
For our small consultancy OnlyOffice DocSpace has replaced Google Workspace at a fraction of the cost — Business plan only charges for admins, which is unique and incredibly cost-effective. Real-time co-editing is genuinely smooth and the built-in audio calls inside the editor are a clever touch.
Source: paraphrased from public Software Advice review — https://www.softwareadvice.com/cms/onlyoffice-docs-profile/
Switched our 200-person company from Microsoft 365 to OnlyOffice self-hosted. Compatibility with existing .docx and .xlsx files is the best I have seen in any non-Microsoft suite. Customer support has been a little slow on a couple of tickets but the product itself has been rock solid for nine months running.
Source: paraphrased from public G2 review — https://www.g2.com/products/onlyoffice-workspace/reviews
If OnlyOffice is not the right fit, the strongest 2026 office suite alternatives are:
Quick answers to the most common questions buyers ask before adopting OnlyOffice in 2026.
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