I wouldn’t want them to keep a session open on their laptop but it’s an interesting idea to keep a session open on their smartphone. I’m writing this note from coracle that I added to my home screen as an app (the session even survived a reboot of my iPhone). Do you know of Android apps that support nsecbunker login? Primal/Amethyst? 

 No, I don't think any native app supports that, unfortunately.