I've been a user for several years. I love the service: courses are many and inexpensive. The app, however, is a piece of trash not fit to install. It is unresponsive, slow, unwilling to play videos I have downloaded to my phone, and unwilling to save files to the SD card, despite the fact the app allegedly has that ability. I don't know what the people at Udemy are doing but it surely isn't fixing this dumpster fire. They should take a few of their programming courses and fix the app.