Authy!

Authy brings the future of two-factor authentication to the convenience of your iPhone or iPad. The Authy app generates secure 2 step verification tokens on your device. Two-factor authentication is one of the best things you can do to make sure your accounts dont get hacked - LifeHackerhttps://www.authy.com/what-is-two-factor-authenticationAre you a fan of Authy?- Follow us on twitter: https://twitter.com/authy- Like us on facebook: https://www.facebook.com/authysec

Free 2FA app for Google, Facebook, Coinbase and more... Download App http://authy.com/app/mobile/
Watch and learn about SendGrid http://authy.com/resources/sendgrid-webinar/'s
implementation of Authy's 2FA service to increase the security of their customer's accounts.