We do — for iOS only right now.
You can find the Sparkle Stories app on the Apple App Store from any mobile device. Just use the search terms "Sparkle Stories." You'll find the image of the little Sparkle guy with his star-wand!
We are working on an Android app! We plan to launch it in early 2021. While you are waiting, you can still access Sparkle Stories from an Android device. Use the streaming website on your phone's web browser, and play the stories there.