$0 $2
iTunes Store has the THX Tune-Up iOS App (iOS 5.0+) for $0 downloaded. Tune your TV, projector, and speakers for optimal THX output. Requires an Apple AV adapter and an HDMI cable.

PCMag gave it 4.5 out of 5 stars.
$0 retail: $2
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jl
Ben's cred: 51
Posted 01/27/2014 at 11:54 AM PT
Posted 01/27/2014 at 11:54 AM PT
There's also an Android (for select models) version out. It requires a slimport or MHL adapter (< $10).