Freeware (the underlying WebView components provided by the operating systems) though DuckDuckGo's custom code for Android and iOS is shared with an Apache-2.0 license[2][3]
In May 2022, an independent researcher discovered that Microsoft products, like Bing and LinkedIn, contained tracking scripts that were not blocked by the browser.[16] DuckDuckGo's founder and CEO explained the company was "currently contractually restricted by Microsoft" due to their use of Bing's data to power the DuckDuckGo search engine.[17] In August 2022, however, the company announced that they would block Microsoft trackers.[18]