It's quite unreal. I remember when the paper and initial implementations came out less than 2 years ago, you had to go through this really long setup process that only worked on certain operating system and was a huge fuss. A few services came out online that would do it for you, but they were slow and limited, with huge queues.

Now, as you mention, you can run it in a few seconds on your phone, or in my case, on my Chromebook, right in the browser, with zero installation. Truly amazing.

It really had trouble with the portraits in my experience.