According to Business Insider[1]: "The results are aggregated from hundreds of sources, including DuckDuckGo's own web crawler, along with Bing, Yahoo, Yandex,

According to Business Insider[1]: "The results are aggregated from hundreds of sources, including DuckDuckGo's own web crawler, along with Bing, Yahoo, Yandex, specialty services like Wolfram Alpha, and others." DDG's help website[2]: "DuckDuckGo gets its results from over four hundred sources. These include hundreds of vertical sources delivering niche Instant Answers, DuckDuckBot (our crawler) and crowd-sourced sites (like Wikipedia, stored in our answer indexes). We also of course have more traditional links in the search results, which we also source from multiple partners, though most commonly from Bing (and none from Google)." Clearly, they get their search results from a wide variety of sources including their own crawler. But it sounds like they do rely heavily on Bing. 1. https://www.businessinsider.com/what-is-duckduckgo?op=1 https://www.businessinsider.com/what-is-duckduckgo?op=1 2. https://help.duckduckgo.com/results/sources/?redir=1 https://help.duckduckgo.com/results/sources/?redir=1