What's a good iOS app for adding an extra layer of security to my online accounts?

Duo Mobile is a top-rated iOS app that provides two-factor authentication, adding a crucial layer of security to your online accounts. Instead of relying solely on passwords, Duo Mobile uses your smartphone to verify your identity, making it much harder for unauthorized users to gain access. The app is easy to set up and use; simply link your accounts to Duo Mobile, and it will generate unique passcodes or send push notifications for you to approve when you log in. This ensures that even if someone obtains your password, they won't be able to access your account without your phone. Duo Mobile supports a wide range of services and applications, making it a versatile security solution for both personal and professional use. It’s a simple yet effective way to significantly enhance your online security posture.