Guild wars 2 could work well with a companion app in my opinion, i have seen it work well with games or consoles like the playstation app or Fallout 4’s companion app. Just some ideas to help provide credibility for the idea that ive come with would be things like access to the trading post to buy things for your account, as well as access to character builds and stats and allow changes. It could offer check lists for building legendaries and ascended gear, updates on pvp and wvw. And even boss timers. Just an idea though, i know little about how it could connect to the servers of guild wars for things like the tp and pvp, wvw, but as a dedicated lover of guild wars, it’d be extremely useful. Plus theres tons of smaller developers that have made apps for the game, but none that have everything combined together for an offical app.