How is this different than Wallabag? (http://wallabag.org/) Wallabag is mature, has mobile apps, self hosted or on their servers and allows you to export stuff as PDF, epub or json.
I'm not seeing that they're claiming to be better than anything, just a, "self-hosted alternative to services like Evernote (R), Microsoft OneNote (R) or Google Keep (R)."
I lost confidence in Wallabag when I encountered a bug with the long lasting session. Everytime I want to save a site, I click the plugin icon, have to login, reopen the site I want to save and click the icon again. The bug is several months old and the developers are unable to track it down. It's very worrisome when something as important as authentication isn't properly understood by the developers.
Are you a contributor to Wallabag?