Yes. The PBS app is free of charge and supports iOS versions 7 and later as well as Android 4+. If you have a device that is older than the supported versions, you can open a browser window on your device and type in video.pbs.org to enjoy many of the same features of the app.
Related topics:
I have downloaded the app, what do I do now?
Will I have the same browsing experience using the app that I have when I browse PBS on my computer?