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Why does the article say Google’s Tango is about the future where as ARKit is now. It feels like they are implying that somehow ARKit is inferior to Tango. Is it true? Is Tango considered to be better somehow?

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Some of the higher comments go into this and it appears that ARKit only implements some of a full AR Stack (Visual Inertial Odometry) while Tango supports it all (SLAM) so it can also have persistence between device reboots and be useful in bigger applications.

I will note I am just repeating the comment and you can see it here: https://news.ycombinator.com/item?id=14640682

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