Ian Dunn

The <a href="https://wordpress.org/plugins/google-authenticator/" rel="ugc">Google Authenticator</a> plugin is a great way to add two-factor authentication to your site, but it does have one major drawback: it asks every user for the authentication token, regardless of whether they have 2FA enabled or not. This can be confusing for users, which prevents some administrators from using the plugin on multi-user sites.
This plugin modifies the way that Google Authenticator behaves so that only users who have it enabled are prompted for the token. If a user doesn’t have it enabled, then they’ll proceed directly to the Administration Panels; if they do have it enabled then they’ll be prompted to enter their 2FA code.

Per User Prompt for Google Authenticator

It is a superb idea to have these kinds of plugins for free without any annoying ads.

Works great!

Modifies the Google Authenticator plugin so that only users with 2FA enabled are prompted for the authentication token.

token2

Token2 helps you proctect your WordPress site from hackers using simple two-factor authentication.
You can get your free API key at <a href="https://www.token2.com/manage" rel="nofollow ugc">www.token2.com</a>.
Plugin development is found at Token2.com

Token2 Two Factor Authentication

Review1

Protect your WordPress site with Token2 two-factor authentication

Per User Prompt for Google Authenticator vs Token2 Two Factor Authentication