Microsoft Azure Authenticator

Microsoft Authenticator is Microsoft's official two-step verification app, which lets you securely sign-in in any service or app. To start using Microsoft Authenticator you'll need to sign-in with a Microsoft email account (your Hotmail, Outlook, or Skype identifier work as well). Once you've signed in, you can start using two-step verification for any other service. Microsoft Authenticator is a good alternative to Google's two-step verification. Plus, it has a simple and clean interface.