It includes many of the features included in the desktop version of Steam Chat, but doesn’t currently support voice chat, although Valve has said this is one of the improvements it’s currently working on.
Steam Chat app features:
Friends List – See who’s in game or online at a glance. Never miss an opportunity to play.
Rich Chat – Your chats get even better with higher fidelity links, videos, tweets, GIFs, Giphy, Steam emoticons, and more.
Invite Links – Add new friends on Steam with a link. Generate an invite link you can text or email.
Customizable Notifications – Mobile notifications mean you’ll never miss a message or game invite. You can customize your notifications per friend, group chat, and chat channel.
Group Chats – Get everyone on the same page. Groups make it easier to do things like stay in touch with your communities and organize game night with your best friends.
Valve also said it’s currently working on significant upgrades to the original Steam Mobile app centred on account security. These include improved Steam Guard options for securely logging into Steam accounts, including QR codes and one-touch login, plus improved app navigation.
Valve launched the Steam Link app for iOS devices last week, a year after it arrived on Android. It enables users to pair an MFI or Steam controller to an iPhone, iPad, iPod touch or Apple TV, connect to a host computer running Steam via a 5Ghz network or ethernet cable, and start playing Steam games on their chosen Apple device.