Sumit Singh

Easily hide your WordPress site from public viewing by requiring visitors to log in first. As simple as flipping a switch.
Make your website private until it’s ready to share publicly, or keep it private for members only.
Features
<ul>
<li>WordPress Multisite compatible.</li>
<li>Specific page redirects visitors back to the url they tried to visit without login.</li>
<li>Extensive Developer API (hooks & filters).</li>
<li>Customizable. Set a specific URL to always redirect to on login.</li>
<li>Filter exceptions for certain pages or posts.</li>
<li>Restrict REST API to authenticated users.</li>
<li>Translation Ready & WPML certified.</li>
</ul>

Visitor force login page

Easily hide your WordPress site from public viewing by requiring visitors to redirect specific or login page in first.

Alex Mills

Have a private blog that you only want your friends or family to read? Then this plugin may be for you. It will redirect all users who aren’t logged in to the login form where they are shown a user-friendly message.
This plugin also features a configuration page where you can easily toggle allowing guests to access your feeds.
A very simple plugin that does only does a simple thing.

Registered Users Only

Works on 4.6. Simple install and use. It's perfect!



Perfect!

Forces all users to login before being able to view your site. Features an options page for configuration.

Visitor force login page vs Registered Users Only