QuarantineWP is a simple plugin that temporarily puts your WordPress site into a "read only" - Code Freeze state for Maintenance Mode or migration. It's most useful when you are migrating a site. or just want to prevent changes.
This helps to show maintenance message for website or a specific page/ post.
Maintenance message can be shown above contents as overlay or as a full page length maintenance mode.
Maintenance Mode page with drag-and-drop builder or under construction | maintenance mode to notify visitors and collects emails. Maintenance Mode templates