An online office suite, online productivity suite or cloud office suite is an office suite offered in the form of a web application, accessed online using a web browser. This allows people to work together worldwide and at any time, thereby leading to web-based collaboration and virtual teamwork. Some online office suites can be installed either on-premise or online and some are offered only as online as a software as a service. Some versions can be free of charge, some have a subscription fee. Some online office suites can run as progressive web applications which no longer require an online connection to function. Online office suites exist as both open-source and proprietary software.