Under maintenance complainers please read – IV Go Review

The reason it’s not working, and I agree it was a great app, is because of Niantic blocking third party scanners etc. Because of this the simple google login to review your Pokémon at a glance is gone. You will have to input manually as the app can no longer pull information from the POGO app via login. So really you stop complaining about it. It was a great app but Niantic ruined it. There’s no way for the developer to update it unless they switch it to screenshot method - which we all hate.
Review by TardisSkOuter on IV Go.