Download This plugin for WordPress here.
Add a maintenance page to your blog that lets visitors know your blog is down for maintenance, or add a coming soon page for a new website. User with admin rights gets full access to the blog including the front end.
Activate the plugin and your blog is in maintenance-mode, works and only registered users with enough rights can see the front end. You can use a date with a countdown timer for visitor information or set a value and unit for information. Also works with WordPress Multisite installs (each blog from the network has its own maintenance settings).
Fully customizable (change colors, texts and backgrounds);
Subscription form (export emails to .csv file);
Countdown timer (remaining time);
Contact form (receive emails from visitors);
Coming soon page;
Landing page templates;
Social media icons;
Works with any WordPress theme;
Exclude URLs from maintenance.