Krypton implements the standardized FIDO Universal 2nd Factor (U2F) protocol to provide secure, un-phishable two-factor authentication on the web, using just your phone.
Cost / License
- Free
- Open Source
Platforms
- iPhone
- iPad




SoloKeys is described as 'Solo is an open source security key, and you can get one at solokeys.com' and is an app in the security & privacy category. There are more than 10 alternatives to SoloKeys for a variety of platforms, including iPhone, Android, Linux, Mac and iPad apps. The best SoloKeys alternative is 2FA Authenticator (2FAS), which is both free and Open Source. Other great apps like SoloKeys are Google Authenticator, YubiKey, Nitrokey and OnlyKey.
Krypton implements the standardized FIDO Universal 2nd Factor (U2F) protocol to provide secure, un-phishable two-factor authentication on the web, using just your phone.




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