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 decrease server access including REST API by checking COOKIE value before accessing to server side script.

For Your Eyes Only

Add a restricted block for specified users.

Simon

Lemonberry Page protect is a free, open source plugin for WordPress to provide a simple method of restricting access to a group of (non-Wordpress) users. It’s intended use is for club member sites etc where you want to keep some information/forms restricted.
Multiple groups can be defined and re-used of multiple pages. The user controls allow change of password.
The administration page allows passwords to be changed, users to be added and groups to be defined.
The excerpt of a post is not blocked.
Note: This plugin will not currently work with all themes, and you’ll get a message after login to show this. We’re working on a solution to make it work with all themes which should be available soon.

Lemonberry Page Protect

Lemonberry Page Protect is a simple way to restict page/post content to a list of (non-Wordpress) users.

For Your Eyes Only vs Lemonberry Page Protect