Interesting thanks - have just targeted desktop for now, though making a sensible responsive layout for mobile should be fairly easy. Albeit it would mean that any snippets on mobile would not be shared with desktop given the local/browser based storage approach.
I can't install apps or use cloud-based solutions at work so I built this primarily for my own usage, but hopefully others might also find it useful.
Source: https://github.com/wrlannen/snippets
Any feedback gratefully received.