So it's now 2019 - we're starting to see implementations of browser notifications for users with only Apple being the only one failing to provide the need service workers to make this possible on iOS. I never really got why users of a site wanted to use an app that limited their use of the site (not all addons were compatible) but then realized that same app could be used on numerous forums to get their notifications. Pretty nice but at the cost of giving up your members data (they also have to agree) and possibly leading them to another competing site. There has been a few apps posted on the XenForo site for sale via the Resource Manager but it seems they were either mismanaged or suffered from slow development. I can only imagine the man hours and cost to continue support of the apps. I did try one of those apps very shortly but it was early in it's development and the cost and process of getting was just far outweighed the need for it at the time. Responsive design really has evolved over the years into a really nice way to bring usability to smaller devices. The only thing missing from that and an app was notifications and a "SSO" of sorts. I can't speak for other software for Push notifications but XenForo released it's version 2.1 which has the ability to push notifications to users via the built in service workers in browsers. Though as mentioned above iOS, no matter the browser, does not support push. It seems like the death of forum apps are near, at least in my opinion. Maybe I missed some features of the usability of a forum app, is there more reason to use an app?