Yes, I'll amend my earlier review that I got this to work on my Android phone. I have a janky made-in-China Android TV box that does most things well, but it doesn't display the Fitzy app properly, hiding some of the show-by-show options.
The only thing it lacks is a proper programming guide. I was only able to go a few hours into the future. So when the new schedule starts on 9/30, I'll probably need to babysit the app that day to make sure the good new stuff gets marked to record.
Haven't tried it on my Fire Stick yet. I run a Roku on my main TV, mainly because we have YouTube TV and the Fire platform doesn't have a YouTube TV app yet. Hopefully that is coming soon, because I actually prefer the Fire platform over the way the Roku is set up.