[oldcynic]

Authy want an email before you can do anything with it, and is cloud centred, so that's probably just sending your usage to someone else.

Try OTP Auth[0] on iOS that fully respects privacy and security. It was Authy asking for email first that prompted me to search and find this.

[0] https://itunes.apple.com/us/app/otp-auth/id659877384

[flafla2]

Authy encrypts all of your data with a private passkey that is never sent to Twilio (the parent company) [0]. I found the ability to sync 2FA across devices to be convenient and a good compromise to “if you lose your phone, you’re screwed.” I can understand both perspectives, but I think Authy has done a great job at improving the usability of 2FA without sacrificing security. This is certainly more secure than SMS-based 2FA which most people currently use.

(Disclaimer: I am currently employed by Twilio. I am not involved with Authy in any way)

[0] https://support.authy.com/hc/en-us/articles/115001932768-Aut...

[nickflood]

Microsoft Authenticator is another alternative and it doesn't need anything (plus is handy for MS 2fa). There's DUO. And I'd wager there are countless other apps as the standard is really simple.