Duet turned my old iPad into a fast MacBook display

I just spent $ 10 on Duet Display to turn my aging iPad into a secondary MacBook display. That’s about 5 times more than I’d normally consider prudent for an app, but it was worth every penny.

I’ve been a daily ipad-as-secondary-display user for years. My goto app had always been Air Display (and then Air Display 2). That just changed. For the same price as Air Display 2 I’m able to ditch the unstable Wi-Fi connection typical to these remote display apps and extend my workspace over an old 30-pin USB cable. That’s given new life to my three-year-old MacBook Air and three-year-old iPad 2. No stutters, no lag, and it’s surprisingly robust enough to support video playback. Duet says its app was developed by a team of ex-Apple engineers and…

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