>Will you spend 30 seconds writing this URL in the URL bar of your computer browser? (oh no, I made a typo in the URL, let's start again...)

Firefox lets you send a tab/link to another device (if you use Firefox sync). No typing necessary.

>Yopp is 7 atomic actions and no more

I like the UX well enough, but calling it just 7 actions completely ignores that you need to have an internet facing webserver with PHP, configured. Many of us here could arrange that pretty easily, but it greatly adds to complexity versus using an existing web-service.