Since, DuckDuckGo knows nothing about you, it can’t serve different results to different users. You’ll get the same results as everyone else.
Startpage searches Google for you – when you submit a search, Startpage submits the search to Google and returns the results to you. All Google sees is a large amount of searches coming from Startpage’s servers – they can’t tie any searches to you or track your searches. Startpage also includes a proxy feature – you can open a page in Ixquick’s proxy directly from the search results.
This is slower than normal browsing, but websites won’t be able to see your IP address.
Ixquick is the main search engine from the company that runs Startpage. Unlike Startpage, Ixquick pulls results from a variety of sources instead of only Google – this can be a good or a bad thing, depending on how much you like Google’s search results. Ixquick and Startpage have essentially the same design.
Ixquick includes the same privacy features Startpage does, including the Ixquick proxy links in the search results.