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Open source Microsoft 365 alternatives

Top Office Suites like Microsoft 365

The most popular alternative to Microsoft 365 is LibreOffice, which has a free version. Other great alternatives to Microsoft 365 are ONLYOFFICE and Collabora Online.

Most alternatives to Microsoft 365 are in the Office Suites category, compared here by price, platform and features.

Microsoft 365 alternatives
AllFreeOpen source
3 apps

All Microsoft 365 alternatives

  1. LibreOffice

    4.5Kstars

    LibreOffice is a desktop office suite maintained by The Document Foundation, with Writer, Calc, Impress, Draw, Base and Math. It uses the OpenDocument format natively and opens and saves Microsoft Office files. It is free for any use, works fully offline and can be extended with community extensions and templates.

    12 LibreOffice alternatives

    Pros

    • Free for any use, with no account or subscription
    • Full suite with Writer, Calc, Impress, Draw and Base
    • Native OpenDocument support and fully offline use

    Cons

    • Interface feels dated next to Microsoft 365
    • Complex Office files can lose formatting
    • No real-time collaboration in the desktop apps
    Cost / License
    FreeOpen source
    Categories
    Office SuitesWord ProcessorsSpreadsheets & Databases
    Platforms
    WindowsMacLinux
    Features
    Ad-freeMicrosoft Office file compatibilityOffline modePlugins & extensionsTemplatesTrack changes
    Visit websiteMore about LibreOffice

  2. ONLYOFFICE

    3.6(176) · App Store

    ONLYOFFICE is an office suite from Ascensio System with editors for documents, spreadsheets, presentations, PDFs and forms, built around Microsoft Office formats. The desktop and mobile apps are free, and the online editors can be self-hosted or integrated into Nextcloud and other platforms, with paid cloud and enterprise editions. It supports real-time co-editing, plugins and AI assistants.

    12 ONLYOFFICE alternatives

    Pros

    • Strong compatibility with Microsoft Office formats
    • Free desktop and mobile apps, plus self-hostable online editors
    • Real-time co-editing and Nextcloud integration

    Cons

    • A self-hosted server needs technical setup
    • Enterprise features and support require paid editions
    • Fewer advanced features than Microsoft Office
    Cost / License
    FreemiumOpen source
    Categories
    Office SuitesWord ProcessorsSpreadsheets & Databases
    Platforms
    WebWindowsMacLinuxiPhoneAndroidSelf-hosted
    Features
    AI assistantMicrosoft Office file compatibilityOffline modePlugins & extensionsReal-time collaborationTrack changes
    Visit websiteMore about ONLYOFFICE

  3. Collabora Online

    3.4Kstars

    Collabora Online is an open source office suite from Collabora Productivity that runs LibreOffice technology in the browser, on your own server or through a hosting partner. It plugs into Nextcloud, ownCloud, Seafile and similar platforms for co-editing Office and OpenDocument files on infrastructure you control. A free development edition sits alongside paid supported versions and Collabora Office apps.

    9 Collabora Online alternatives

    Pros

    • Open source online office suite you can host on your own servers
    • Integrates with Nextcloud, ownCloud and Seafile for co-editing
    • Keeps documents on infrastructure you control

    Cons

    • Interface feels dated next to Google Docs or Microsoft 365
    • Self-hosting requires server setup and maintenance
    • Supported production versions are paid
    Cost / License
    FreemiumOpen source
    Categories
    Office SuitesWord ProcessorsSpreadsheets & Databases
    Platforms
    WebWindowsMacLinuxiPhoneAndroidSelf-hosted
    Features
    IntegrationsMicrosoft Office file compatibilityReal-time collaborationTrack changes
    Visit websiteMore about Collabora Online

Microsoft 365 vs its alternatives at a glance

Pricing, platforms and the key features of Microsoft 365, compared with its most popular alternatives.

Microsoft 365 vs its alternatives at a glance
AppPricingPlatformsAI assistantCross-device syncMicrosoft Office file compatibilityReal-time collaborationTemplates
Microsoft 365FreemiumWeb, Windows, Mac, iPhone, Android
LibreOfficeFreeOpen sourceWindows, Mac, Linux
ONLYOFFICEFreemiumOpen sourceWeb, Windows, Mac, Linux, iPhone, Android, Self-hosted
Collabora OnlineFreemiumOpen sourceWeb, Windows, Mac, Linux, iPhone, Android, Self-hosted

Microsoft 365 alternatives: frequently asked questions

What is the best alternative to Microsoft 365?

The most popular alternative to Microsoft 365 is LibreOffice: Free, open source office suite for Windows, Mac and Linux. Other great alternatives are ONLYOFFICE and Collabora Online.

Is there a free alternative to Microsoft 365?

Yes, 3 alternatives are free or have a free plan, including LibreOffice, ONLYOFFICE, and Collabora Online.

Is there an open source alternative to Microsoft 365?

Yes, 3 open source alternatives are listed, including LibreOffice, ONLYOFFICE, and Collabora Online.

Is Microsoft 365 free?

Microsoft 365 has a free plan, with paid plans that unlock more features.

Compare Microsoft 365 with its alternatives

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