Clef provides easy-to-use strong two-factor authentication using smartphones.
https://wordpress.org/plugins/wpclef/
Widgets · WordPress Plugins
Get access to data on 262,097 websites that are Clef Two-Factor Authentication Customers. We know of 22,830 live websites using Clef Two-Factor Authentication and an additional 239,267 sites that used Clef Two-Factor Authentication historically and 12,046 websites in the United States.
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Get a list of 262,097 websites using Clef Two-Factor Authentication which includes location information, hosting data, contact details, 22,830 currently live websites and an additional 2,839 domains that redirect to sites in this list. 239,267 sites that used this technology previously and 12,046 websites in the United States currently using Clef Two-Factor Authentication.