Duo Mobile – Basic but Reliable

Duo Mobile is a two-factor authentication app that does exactly that. You won’t get many special features compared to other options on the list, but that’s not necessarily a bad thing.

The Duo Mobile app focuses on managing your two-factor authentication codes for other apps and platforms, and it does a pretty good job at it. If you’re only looking for an app to authenticate your identity from your iPhone, iPad, or even your Apple Watch, then Duo Mobile might be the right app for you.