Augmented reality subway app comes to NY, SF

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British iPhone application developer Acrossair is bringing its augmented reality app Nearest Tube to New York today and San Francisco on Monday. Now called Nearest Subway, it superimposes directions to the nearest subway stops over the iPhone 3GS’ live video feed.

A few augmented reality companies have had difficulty launching on the iPhone because they say Apple doesn’t have a public application programming interface (API) for manipulating live video. The developers say they aren’t allowed to launch apps with private APIs.

Acrossair says it gets around this because it only uses the video feed as a background. Its app doesn’t need to recognize or alter anything in the video stream, said spokesperson Chetan Damani.

Damani says Acrossair will bring the app to other large cities where iPhone market penetration is high enough to warrant it.

Acrossair has six employees in London and Mumbai and is currently self-funded.

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