Open source Nextcloud alternatives

All Nextcloud alternatives

1. 

   

   Syncthing

   89.3KstarsLike

   Syncthing continuously synchronizes folders directly between your computers and servers, without storing anything on a third-party cloud. Connections are encrypted and authenticated, devices find each other on the local network or through relays, and per-folder versioning keeps old copies of changed files. It is free, open source and configured through a local web interface.

   8 Syncthing alternatives

   Pros

   • Syncs directly between your devices with no third-party cloud
   • Free and open source, with encrypted connections
   • Per-folder versioning keeps copies of changed files

   Cons

   • Configuration through a web interface is less approachable for non-technical users
   • Devices must be online at the same time to sync
   • No official mobile apps

   Cost / License

   FreeOpen source

   Categories

   Cloud Storage & File Sharing

   Platforms

   WindowsMacLinuxSelf-hosted

   Features

   End-to-end encryptionFile syncFile versioning

   Visit websiteMore about Syncthing
2. 

   

   Proton Drive

   4.1(1.2K) · App StoreLike

   Proton Drive is the encrypted cloud storage service of Proton, the Swiss company behind Proton Mail. Files and file names are end-to-end encrypted, the apps are open source and files can be shared through password-protected links. It offers desktop sync on Windows and macOS, mobile photo backup and a free plan, with more space in Proton's paid bundles.

   12 Proton Drive alternatives

   Pros

   • Files and file names are end-to-end encrypted
   • Open source apps from a Swiss privacy-focused company
   • Password-protected share links and mobile photo backup

   Cons

   • No desktop app for Linux
   • Fewer third-party app integrations than mainstream clouds
   • The free plan offers limited storage

   Cost / License

   FreemiumOpen source

   Categories

   Cloud Storage & File Sharing

   Platforms

   WebWindowsMaciPhoneAndroid

   Features

   End-to-end encryptionFile syncFile versioningLink sharingPhoto backup

   Visit websiteMore about Proton Drive
3. 

   

   Collabora Online

   3.4KstarsLike

   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
4. 

   

   ONLYOFFICE

   3.6(176) · App StoreLike

   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