Circles also works on other modern browsers, such as Opera, though support for these browsers is not a priority.
With the release of the HTML5 version of Circles, the Flash-based line has entered the bugfix-only mode. This means that further releases of Circles Flash will contain only bug fixes, new features will be introduced only in HTML5-based version. HTML5 version is more compact and does not depend on third party plugins. In some corporate environments you may still need to use the flash version though (because only old browsers are available, for example).
Unless you need to support older browsers, mainly Internet Explorer 8 or earlier, we recommend migrating to HTML5 Circles.
Stephan Schmid, CEO at Comcepta, Switzerland
Dr James Thomas, Associate Director, EPPI-Centre, Social Science Research Unit, Institute of Education, London
René de Vries, Managing Director at HowardsHome