What browser engine does DuckDuckGo use?

I understood DDG for Android uses WebView, and WebView only comes with Chrome and Chromium.

https://www.reddit.com/r/androidapps/comments/gwpb9n/is_duckduckgo_privacy_browser_based_on_chromium/

As for Mac, I read it uses WebKit. I'm inclined to think it does because when I try to install my password manager's addon on DDG for Mac, I end up reinstalling it for Safari.

https://www.reddit.com/r/PrivacyGuides/comments/u290gj/introducing_duckduckgo_for_mac_a_private_fast_and/

Regarding the Windows flavour of DDG, the announcement says it is not Chromium-based. What browser engine does it use then?

https://www.reddit.com/r/duckduckgo/comments/11f0v4z/calling_all_ducks_we_need_testers_for_our_beta/

Please, can you correct me if I get anything wrong?