Fumiki Takahashi

TAROSKY INC.

Hametuha INC.

This plugin adds a block to your block editor. 
This block changes its display depending on a current user’s capability.
<ul>
<li>You can set capability for block.</li>
<li>If a current user has a capability for the block, its content will be replaced.</li>
<li>Or else, block is displayed as log in link.</li>
<li>This block is an inner block, so you can nest any blocks inside it. Convert it to a reusable block for your productivity.</li>
</ul>
See screenshot for how block will be displayed.
This plugin use REST API to convert block content, so you can use it with cached WordPress. 
Even if you use CDN like <a href="https://aws.amazon.com/cloudfront/" rel="nofollow ugc">CloudFront</a> or <a href="https://www.cloudflare.com/" rel="nofollow ugc">Cloudflare</a>, this plugin displays proper contents for each users.
For performance enhancement, <a href="https://wordpress.org/plugins/cookie-tasting/" rel="ugc">Cookie Tasting</a> is recommended. 
It decreases server access including REST API by checking COOKIE value before accessing to server side script.
<h4>Hooks</h4>
Display Customization
<ul>
<li><code>fyeo_tag_line</code> – Customize the default tagline displayed to users without capability. <code>%s</code> will be replaced with login URL.</li>
<li><code>fyeo_login_url</code> – Replace the login URL. Default is <code>wp_login_url()</code>.</li>
<li><code>fyeo_redirect_url</code> – Customize redirect URL after login. Receives post object as second argument.</li>
<li><code>fyeo_redirect_key</code> – Change query parameter key for redirect. Default is <code>redirect_to</code>.</li>
<li>
<code>fyeo_enqueue_style</code> – Whether to enqueue default theme style. Return <code>false</code> to disable.
Capability Control
</li>
<li>
<code>fyeo_capabilities_list</code> – Customize available capabilities list shown in block settings.
</li>
<li><code>fyeo_default_capability</code> – Change default capability. Default is <code>read</code>.</li>
<li>
<code>fyeo_user_has_cap</code> – Override capability check result. Receives <code>$has_cap</code>, <code>$capability</code>, <code>$user</code>.
Rendering
</li>
<li>
<code>fyeo_default_render_style</code> – Set default rendering style. Return <code>dynamic</code> for PHP rendering, empty string for async.
</li>
<li>
<code>fyeo_can_display_non_public</code> – Allow displaying restricted content for non-public posts. Receives <code>$post</code> object.
REST API
</li>
<li>
<code>fyeo_minimum_rest_capability</code> – Control REST API access. Return <code>false</code> to deny access.
</li>
</ul>

For Your Eyes Only

Add a restricted block for specified users.

Matt Martz

Andy Stratton

Restrict certain pages or posts to logged in users
This plugin will allow you to restrict all, none, or certain pages/posts to logged in users only.
In some cases where you are using WordPress as a CMS and only want logged in users to have access to the content or where you want users to register for purposes unknown so that they can see the content, then this plugin is what you are looking for.
Simple admin interface to select all, none, or some of your pages/posts. This now works for posts!
<h3>Upgrade</h3>
<ol>
<li>Deactivate the plugin through the ‘Plugins’ menu in WordPress</li>
<li>Delete the previous <code>pagerestrict</code> folder from the <code>/wp-content/plugins/</code> directory</li>
<li>Upload the new <code>pagerestrict</code> folder to the <code>/wp-content/plugins/</code> directory</li>
<li>Activate the plugin through the ‘Plugins’ menu in WordPress</li>
</ol>
<h3>Usage</h3>
<ol>
<li>Visit Settings>Page Restrict in the admin area of your blog.</li>
<li>Select your restriction method (all, none, selected).</li>
<li>If you chose selected, select the pages you wish to restrict.</li>
<li>Enjoy.</li>
</ol>

Page Restrict

This plugin used to work great, but with WordPress 4.8+, it fails and the author hasn't provided any recourse. For shame.

Doesn't work. Author(s) refuse to support

Restrict certain pages or posts to logged in users.

For Your Eyes Only vs Page Restrict