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I like how I can use it from my iphone safari. What mobile framework did you use (if any) to make this? / especially the upload image part?

Mobile devices were very much an afterthought. I was getting mobile traffic and did a best effort to make it passable, but I don't recommend it.

You should check out Bugshot (https://itunes.apple.com/us/app/bugshot/id669858907?mt=8) which I think does a much better job on iOS.