Metra users will be able to buy mobile tickets - including monthly passes - and store the tickets on their phone.
CTA and Pace users can use the app to add value to their Ventra cards, which must still be used at the turnstile.
The app is free. It is available via the App Store and Google Play.
For more information, visit www.ventrachicago.com or check out this overview. To see how the Ventra app works, watch this video: