Based on our record, Authy seems to be a lot more popular than eFax. While we know about 139 links to Authy, we've tracked only 2 mentions of eFax. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Side note: There are free online fax services. The document is uploaded from your computer and faxed to the appropriate number. Scan the docs (if not already on the computer) with your phone. Save them to google drive or email them to yourself. Then use something like myfax.com or efax.com to fax them for free. Source: over 2 years ago
I am wondering if there is a similar fax server software that you can install in your server and then connect your fax machine or receive and send virtual fax like efax.com (they charge 18 dollars a month). Source: about 3 years ago
Authy - Two-factor authentication (2FA) on multiple devices, with backups. Drop-in replacement for Google Authenticator. Free for up to 100 successful authentications. - Source: dev.to / 5 months ago
Https://authy.com/ Acquired by Twilio. I'm not even sure if they still update it, last blog post was 3 years ago. - Source: Hacker News / 7 months ago
2FA apps such as Google Authenticator and Authy randomly generate a code every minute or so, which is matched to a specific key associated with your login. In essence, this means that whenever a login asks for your 2FA code, it knows which number to expect and will only unlock if that correct number is entered. Source: 7 months ago
You can also set up the Authy authenticator app on a PC, so you don't have to use a mobile app at all, but use a PC app instead :). Source: 12 months ago
Check out authy. It's considered less secure than other device-specific OTP solutions, but it's better than not using it. Source: about 1 year ago
Hellofax - Easy. Reliable. Online faxing. Send & receive faxes from anywhere.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
faxZero - Internet fax application.
Duo Security - Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.
myfax - Hosted digital fax solution
Azure Multi-Factor Authentication - Azure Multi-Factor Authentication helps safeguard access to data and applications while meeting user demand for a simple sign-in process.