im not an 'app' person, so i have no idea. i do know there were several in active development, but i just have not cared.
firefox on my phone seems to do exactly what i need to with regards to mbin (or reddit even), so i have never, ever understood the need for a site-specific app.
i kinda thought thats why we spent 20 years making 'reflexive' websites designed to be scalable to different sized screens