I am using google auth.

As somebody posted here before, read this links:

Authy VS Google authenticator(r/androidapps): https://www.reddit.com/r/androidapps/comments/64xkkr/authy_vs_google_authenticator/
Authy vs Google Authenticator - Coinbase(r/bitcoin): https://www.reddit.com/r/Bitcoin/comments/5ol41r/authy_vs_google_authenticator_coinbase/