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Ever thought of developing an app?
I also think it would be nice if there was one
Sounds costly, If you guys offer to pay for it's development, I'm sure there'll be no objections
XenForo is responsive, so it doesn't need an app. The 2.1 version (just released stable yesterday) is more mobile friendly than 1.5 (this version on Head-Fi), and even adds notifications for Chrome browsers (and a couple of others), including on mobile devices. I used to use Tapatalk on a few forums I run, but it was a security nightmare, had poorly written code and even worse support.
There are always rumblings of someone making an "app" but it never gains traction, since so few see a need for it. I don't like making users download anything to visit our forums; but, there is a simple line of code the admins can add that will let users save the forum to their home screen, which then in turn will open in a "chromeless" browser window that looks and sort of operates like a separate app.
I don't visit here often, but just happened to check in today and noticed the change to XenForo. Nice job from all those involved!