(yes)
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(I tried to reply via my Android, but might've got lost in the ether).
So, yes, the Interislander is the larger service, with three ferries crossing Cook Strait, and is usually a cheaper for taking vehicles across. Bluebridge with two ferries, has a cheaper fare structure for foot passengers, and they are also advertising free wi-fi. But you should check their websites, as there may be specials depending on the time of year.
http://www.interislander.co.nz/
http://www.bluebridge.co.nz/trip-info/
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