Is Metra Late is no longer available for download. Metra's tracking data about their trains is unusably bad and I could not offer better options. Chicago commuters deserve better. Folks who have the app already can use it as long as they would like - the backend that powers it will remain active.
I cannot actually track thousands of trains. Is Metra Late relies on data provided by Metra regarding current delays. Unfortunately, just as Metra often has trouble running their railway, they also sometimes have trouble providing accurate data too.
Unfortunately there is little I can do about this. It's up to Metra. I encourage you to contact Metra and request better real-time train tracking.