Steam Link now available on App Store.
Steam Link iOS

Valve continues to expand the ways in which you can play your game library. Today, iOS users can now play their desktop based Steam library on any modern iOS device. The studio released their Steam Link application through the App Store, allowing you to stream your desktop titles to devices like your iPhone. Other supported devices include the iPad and even Apple TV.

So long as your device meets the following requirements, you should be good to go.

The Steam Link app brings desktop gaming to your iPhone or iPad. Just pair an MFI or Steam controller to your device, connect to a computer running Steam on the same local network, and start playing your existing Steam games.

Requirements:
  • iPhone or iPad using iOS 10 or higher
  • Computer running Steam - Windows, Mac, or Linux
  • iOS device must be on the same local network as the computer running Steam
For best performance:
  • Connect your computer using Ethernet to your 5Ghz WiFi router
  • Connect your iOS device to the 5GHz band of your WiFi network
  • Keep your iOS device within a reasonable range of your router
The Steam Link application has been out now for a number of months for Android devices and Raspberry Pi. It was also the name used for the physical piece of hardware that allowed you to stream your games to a TV set.