Horribly unreliable. Originally I thought it was my Nexus 5. Then got a 5x same thing. Then I thought it was my yubikey neo, got another one. No, this app just sucks. Strange as the clip ap works fine. This one gives me communication errors more often then codes.
Hardly ever detects the Yubikey Neo, takes multiple attempts on my Galaxy S6 which makes 2FA frustrating. There is a great idea here delivered with a poor app.
Great app Even move secure than the app offered by Google. Thanks for listening to our feedback. There's still one issue. The app doesn't reload, so when the timer stops you have to exit the app and reopen it again
App has always been difficult to use. It only detects the nfc Yubikey token (neo) about 1/3 of the time (I use it on 3 phones. All have the same problem.). Today it stopped generating codes completely on all three phones. It generated the tone when I got it to recognize the yubikey but it did not display any authentication key on any phone. Clearing cache and app data did not help. So I tried to re-setup the google authentication on google web site. The app crashed after reading the QR code. Every time. I tried multiple times on each phone. The app is now worthless. I don't know if there is another use for the Yubikey token or not. Installed authy. While not tied to the Yubikey it at least works.
Unfortunately the app does not yet support U2F via NFC, which means that you still need to have the Google Authenticator app installed as well to use it.
an intesting idea. instead of the app generating the codes like other authenticator apps, this uses the yubico neo to "generate" the codes so that there's a supposed less chance of someone getting the codes. probably not for most people. I think most people will like just using a normal authenticator app instead of this extra layer of security. but it seems to work fine at the moment
* Version 1.1.0 released 2016-09-09
** Retain codes on screen rotate.
* Version 1.0.5 released 2016-03-08
** Made algorithm check case insensitive (needed for FreeIPA).
** Minor tweaks to NFC handling (Nordpol library). App now requires Android ASK level 15.
** Support for displaying Steam Mobile Authenticator codes (no support for importing such a credential).