AuthCat is a simple and clean two-factor authentication code app.
Your accounts data are stored securely in the app with Core Data encryption.
Authcat works with any online account that utilize TOTP (time-based OTP), like AWS, Google, Twitter, DigitalOcean, and many more.
When you are switching phones, you can choose to export and import the accounts data to the new phone, no need to reset them one by one again.
You can also opt for iCloud sync where your OTP can be shared across all your iOS devices.