Clef provides easy-to-use strong two-factor authentication using smartphones.
https://wordpress.org/plugins/wpclef/
Widgets · WordPress Plugins
Get access to data on 220,116 websites that are Clef Two-Factor Authentication Customers. We know of 20,396 live websites using Clef Two-Factor Authentication and an additional 199,720 sites that used Clef Two-Factor Authentication historically and 10,820 websites in the United States.
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Get a list of 220,116 websites using Clef Two-Factor Authentication which includes location information, hosting data, contact details, 20,396 currently live websites and an additional 2,559 domains that redirect to sites in this list. 199,720 sites that used this technology previously and 10,820 websites in the United States currently using Clef Two-Factor Authentication.