I was curious about trying out my own diff so I went to the home page: https://www.difflensapp.com/ and didn't see an option.

It would be interesting to be able to append a github compare / pr / tree-ish link to see the diff via difflens, so maybe something like:

https://www.difflensapp.com/github.com/rails/rails/commit/7d...

would render that diff via diff lens. just an idea to get more people testing.