Google Authenticator Reviews

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If you could have exactly the same functionality as Google Authenticator or Authy but using open source software, you should prefer it for reasons of transparency and security, at the very least. That's what TOTP AUTHENTICATOR with premium features. Code generation, Widget Support, Multi-Account Support, Completely Offline, Extra Security, Account Customisations, Cross platform Backup/Restore, Multi-Device support and much more.
iOS: https://apple.co/2O1ft0S ,
Android: http://bit.ly/2v47wjP

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