Did you mean OS X Safari instead?

Changing Your Search Engine to DuckDuckGo

1. Open the Settings app
   
2. Tap "Safari"
   
3. Tap "Search Engine"
   
4. Select "DuckDuckGo"
   

However, please know that if you just use the search engine, we cannot offer our web tracking protections when you visit other web sites. To get that protection, you need to use our extension or browser. Our free web browser is available for iOS, Android, Mac, and Windows . It comes with seamless privacy protection built-in, including private search, tracker blocking, increased encryption, email protection, and more.

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Prior versions on GitHub.