OwnCloud (stylized ownCloud) is a suite of client-server software for creating file hosting services and using them. OwnCloud is functionally very similar to the widely used Dropbox, with the primary functional difference being that OwnCloud is free and open-source, and thereby allowing anyone to install and operate it without charge on a private server. It also supports extensions that allow it to work like Google Drive, with online document editing, calendar and contact synchronization, and more. Its openness eschews enforced quotas on storage space or the number of connected clients, instead having hard limits (like on storage space or number of users) defined only by the physical capabilities of the server.


Frank Karlitschek, a KDE software developer, started developing OwnCloud in January 2010, in order to provide a free software replacement to proprietary storage service providers.

OwnCloud has been integrated with the GNOME desktop.[7] Additional projects that use or link to OwnCloud include a Raspberry Pi project to create a cloud storage system using the Raspberry Pi's small, low-energy form-factor.[8]

In April 2016 Karlitschek and many of the top contributors left ownCloud Inc.[9][10] Five weeks later they started Nextcloud, a fork of ownCloud.[11]



In order for desktop machines to synchronize files with their OwnCloud server, desktop clients are available for PCs running Windows, OS X, FreeBSD or Linux. Mobile clients exist for iOS and Android devices. Files and other data (such as calendars, contacts or bookmarks) can also be accessed, managed, and uploaded using a web browser without any additional software. Any updates to the file system are pushed to all computers and mobile devices connected to a user's account.

The OwnCloud server is written in the PHP and JavaScript scripting languages. For remote access, it employs sabre/dav, an open-source WebDAV server.[12] OwnCloud is designed to work with several database management systems, including SQLite, MariaDB, MySQL, Oracle Database, and PostgreSQL.[13]