Similar use case (2FA), but different implementation.
Instead of typing in a code, you press a button. It also protects against phishing by validating the URL of the site you're authenticating on (with a code-based 2FA you can still enter your code on a phishing site, which then forwards it to the real one).
AIUI Krypton is basically doing the same thing as these FIDO2 Security Keys, but their software substitutes an app on your Phone for the Security Key. So a web site offering WebAuthn can't tell the difference (unless you allow it to interrogate the "Security Key" to ask who made it, which you probably shouldn't)
I personally would rather have Security Keys, but a solution like Krypton is definitely easier for a lot of users and obviously the price differential is hard to argue with.
Instead of typing in a code, you press a button. It also protects against phishing by validating the URL of the site you're authenticating on (with a code-based 2FA you can still enter your code on a phishing site, which then forwards it to the real one).