Sidecar TV, Plugin Developers

This will protect the user or admin facing wordpress pages. Separate login and passwords can be setup for each.
This isn’t anything fancy, not super secure, just basic and easy. It is called simple after all.

Simple Privacy

A simple way to create a private Wordpress blog with htauth.

jamesdlow

Makes your wordpress blog private unless the user is logged in, optionally setting a minium user level. Modified from https://wordpress.org/extend/plugins/force-user-login/

Force User Login Multisite

Makes your wordpress blog private unless the user is logged in, optionally setting a minium user level. Modified from http://wordpress.

Simple Privacy vs Force User Login Multisite