[Tomte]

The problem is that thiy type of tool needs mobile apps for both iOS and Android before people will use it.

Doable, but much more effort than a first attempt on bookmarking.

[kungtotte]

For early adopters it would be enough to have a great import functionality. There are lots of mobile note taking apps that support cloud saves or exports/saves in open formats, so people could use one of them and save to a folder on Dropbox or Gdrive and have the main app source content from there.