kengher

Broadcast simple, important alerts across your multisite network. Also great for single sites.
Features of Site Alert: 
* Display alert(s) in the Homepage with option to show in all pages of a site. 
* Native WordPress WYSIWYG message creation box for simplicity with media support. 
* Choice of hardcoded at the different parts of the page, or make it a pop-up modal. 
* Indicate different priority levels (colors) and icons. 
* Set a date range to publish/unpublish the alert.
Features as a Network Admin 
* Show alert across all all sites in your multisite network. 
* Exclude alert(s) from certain sites. 
* Site Groups manager to provide easier bulk exclusions.

Super Simple Site Alert

Broadcast simple, important alerts across your multisite network. Also great for single sites.

Andrew Lima

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.

Simple Alert Blocks

Simple Alert Boxes are a nice elegant way to achieve quick alert styles within the block editor.

The code is well-done and lightweight and doesn't include too many fancy options.

In the future, I hope the author will consider more custom styling, but I suppose in order to keep the alert boxes simple, decisions over options is the right path here.

I have forked this plugin into something more advanced, so I am very intimate with the code in this plugin. Andrew hits it out of the park as usual.

Cheers,

Ronald Huereca

Very Simple as in its title

Simple alert notices for the new WordPress block editor.

Super Simple Site Alert vs Simple Alert Blocks