Super Simple Site Alert Best WordPress plugin
Super Simple Site Alert
Description
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.
Screenshots
Alerts management 
Adding / Editing an alert 
Custom alert colors 
Frontend display 
Network Admin Site Groups management
Installation
MINIMUM REQUIREMENTS
* WordPress 5.7 (untested in previous versions)
* PHP 7.3 (untested in previous versions)
INSTRUCTIONS
* Locate ‘Site Alert’ on the WP Dashboard menu.
* Create an alert or click on the title of the alert to edit it.
* Type your message in the WP text editor.
* In the ‘Behavior’ section, ‘Embed in page’ and/or ‘Pop-Up’ must be selected.
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