Clef provides easy-to-use strong two-factor authentication using smartphones.
https://wordpress.org/plugins/wpclef/
Widgets · WordPress Plugins
Get access to data on 179,042 websites that are Clef Two-Factor Authentication Customers. We know of 12,271 live websites using Clef Two-Factor Authentication and an additional 166,771 sites that used Clef Two-Factor Authentication historically and 5,927 websites in the United States.
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Get a list of 179,042 websites using Clef Two-Factor Authentication which includes location information, hosting data, contact details, 12,271 currently live websites and an additional 2,129 domains that redirect to sites in this list. 166,771 sites that used this technology previously and 5,927 websites in the United States currently using Clef Two-Factor Authentication.