Clef provides easy-to-use strong two-factor authentication using smartphones.
https://wordpress.org/plugins/wpclef/
Widgets · WordPress Plugins
Get access to data on 199,160 websites that are Clef Two-Factor Authentication Customers. We know of 16,610 live websites using Clef Two-Factor Authentication and an additional 182,550 sites that used Clef Two-Factor Authentication historically and 8,593 websites in the United States.
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Get a list of 199,160 websites using Clef Two-Factor Authentication which includes location information, hosting data, contact details, 16,610 currently live websites and an additional 1,724 domains that redirect to sites in this list. 182,550 sites that used this technology previously and 8,593 websites in the United States currently using Clef Two-Factor Authentication.