Try the service for free. You can't modify calendar settings. No location-based calendars are available (such as Sun or Weather).

With an account you may use more calendars, rename them and modify their settings.

With a small payment you get access to all calendars in all languages. Data is available in ICS (iCalendar) and RSS formats. Calendar settings are preserved when you upgrade from Free Account.

Pro account gives full access to most calendars in all formats (ICS, JSON, CSV, TSV, XML, RSS) in all languages. Data can be used for commercial purposes excluding the following:

You may display the data any way you wish, but you may not resell the raw data.