Updating your site and want to show “Coming Soon” page? No plugin needed.
Add to wp-config.php:
define('WP_MAINTENANCE_MODE', true);
Visitors see default maintenance page. You (logged in as admin) see site normally.
Custom Message: Create .maintenance file in WordPress root:
<?php $upgrading = time(); ?> <h1>Site Under Maintenance</h1> <p>We'll be back soon!</p>
Remove: Delete the define line or .maintenance file when done.