We regret to inform you that Apple iPhones and iPads pre-iOS 11 do not support the necessary features to allow PlumeVR to work in your browser. Unfortunately, you must upgrade to iOS 11 to be able to use this application, as Apple ties browser updates to operating system updates.
We're very sorry. Apple uses this bundling to sell more devices. We can't do anything about it.
In the meantime, please visit Primrose VR to see a collection of WebVR demos that do work on iOS <= 10.