Raihanul Islam

Easily add unlimited alert boxes for the new WordPress block editor. This includes dismissible alert notices.
This plugin works only in the Gutenberg/Block editor. Please use WordPress 5.0 and above or the Gutenberg plugin for pre 5.0 WordPress installations.

Awesome Alert Blocks

Awesome Alert Blocks notices for the new WordPress block editor.

Adam Walter

Admin Notice is a very simple plugin that allows you to display custom notices in the WordPress admin that is visible to all users.
Control over the notice text and styling is available from the plugin’s settings page.
Developers can use the <code>admin_notice_enable</code> hook to control the notice’s visibility on a more granular level. The following example demonstrates how to show the notice only in the “Posts” area of the admin.
<pre><code>add_filter('admin_notice_enable', function($enabled) {

 $screen = get_current_screen();

 if (isset($screen->post_type) && $screen->post_type !== 'post') {
 $enabled = false;
 }

 return $enabled;

}, 10, 1);
</code></pre>

Admin Notice

Nice Plugin!

Display a custom notice to all users in the WordPress admin.

Awesome Alert Blocks vs Admin Notice