lernu! is only tested using Firefox 1.4+ (on Windows, MacOS and Linux) and Internet Explorer 6+ (on Windows). Because of this we recommend that you use one of these web browsers when using the website.

To be able to use the sound player, instant messenger and virtual classroom you must have Flash support installed on your computer. You can download it here (in the top right-hand corner of that page you can select another country and language).

If, despite using a suitable web browser and having Flash support installed, you experience any errors while using lernu!, or if any page doesn't look right, please tell us by means of the comment link that can be found at the bottom of every lernu! page.