What are some alternatives?
When comparing Contus Fly and RingCaptcha, you can also consider the following products
Slack - A messaging app for teams who see through the Earth!
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
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.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.