OTP Auth is an authenticator app that can replace Google Authenticator and Authy. OTP Auth is a better choice overall. The app syncs your authentication data across multiple devices using iCloud. It can also create encrypted backups of your data.
OTP Auth can be used with any service that uses one time passwords. This includes services like Dropbox and GMail with two-step-verfification enabled.
OPT Auth is available for iPad, iPhone and Apple Watch.
There is also a paid version available for MacOS. It integrates with the Safari browser, but it also be used as a stand alone app.
Data Privacy and Security
OTP Auth does not collect information from user, and no information is sent from the app.
OTP Auth does not connect to the internet and will not send your accounts to someone else. If iCloud sync is enabled, an AES-256 encrypted copy of your accounts is stored in your iCloud Drive. The password for that copy will never leave your phone.