It claims, for example, that Radio Farda has been trying like "other media associated with the movement that claims support for democracy" to suggest there have been differences between Iranian Supreme Leader Ali Khamenei and President Mahmud Ahmadinejad while "rejoicing" over it.
"Radio Dirooz" has been registered by an individual named Javid Arabshahi, who has registered some 50 other domains, including the website of Iran's hard-line "Hezbollah" in the city of Gonabad.
The editor of Radio Farda's website, Fred Petrossian, suggests that "the time and effort" invested in the newly launched website demonstrates "the impact" Radio Farda is having.
"Radio Dirooz modifies some of the content of our reports to match their goals. They're obviously investing a lot of time in this," Petrossian says.
Last year, Iran's Culture Ministry published a book on Radio Farda that described it as part of a "soft war" against the Islamic republic.