I use Authy for a few reasons. One is the ability to sync and use it across multiple devices. This is really convenient. But the killer is the desktop app. I'v

I use Authy for a few reasons. One is the ability to sync and use it across multiple devices. This is really convenient. But the killer is the desktop app. I've had a number of instances where someone I was helping could not get the time of their phone and computer close enough to properly generate codes. Running the Authy app on the machine meant the time matched perfectly and they were finally able to log in. It's not perfect but has some killer features.