Will there be a speedrun.com app?

There are a few unofficial apps, I doubt there are any plans to make an official one (and if there is, I imagine it's fairly low on the list of priorities). The site works pretty well on mobile as it is and creating/maintaining a mobile app (and multiple versions of that app for IOS, Android, etc) would create a lot of extra work for site staff that could instead be used to improve the site for everybody.