When comparing Cortana vs Q-Dir (the Quad Explorer), the Slant community recommends Q-Dir (the Quad Explorer) for most people. In the question“What are the best power user tools for Windows?” Q-Dir (the Quad Explorer) is ranked 48th while Cortana is ranked 74th. The most important reason people chose Q-Dir (the Quad Explorer) is:
Every window can be separately customized. You can choose between different views from 1 to 4 windows, and every window can have multiple tabs!
Specs
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Pros
Pro Can recognize music
You can ask Cortana what music is playing and she will attempt to identify it.
Pro Will let you know when artists you're interested in play in your area
Cortana monitors your Bing search history, social network actions, music played, etc to find out what are your favorite artists and will let you know if they plan to play in your area.
Pro Highly manageable multiple windows
Every window can be separately customized. You can choose between different views from 1 to 4 windows, and every window can have multiple tabs!
Pro You can view 4 windows simultaneously
Pro You can use tabs in every window
Pro Portable
Pro Free
Pro Does not use a lot of RAM
Q-dir with 4 windows and with 4 tabs in every window uses only 39mb of RAM on Win10x64.
Pro Fast and stable
Pro Very customizable
Pro Q-Dir allows you to save folder combinations as a favourite to open any time
Up to 64 folder combinations can be saved in a favorite, since each of the four windows is equipped with tabs (ie 4 x 16 tabs 4 x Tree View plus 4 x Address Bar).
Cons
Con Functionality is limited on non-Windows devices
While Cortana is available on Android and iOS, certain features on those operating systems are either limited or non-existant. For example, there's no hands-free voice activation on iOS, and on Android it's only available on the homescreen and nowhere else, etc.