ThemeGrill

Allows you to quickly create a maintenance/coming-soon page. You can use this plugin whenever your site is down for maintenance, currently going any upgrade or is in development. Built in options panel to add logo, background image, social icons, color, subscribe field and many more.
Get free support at http://themegrill.com/support-forum/
check the demo at http://themegrill.com/plugins/maintenance-page/
<h3>Features And Options:</h3>
<ul>
<li>Responsive design looks great on your devices.</li>
<li>Logo Upload</li>
<li>Background image/color option</li>
<li>Subscriber Feature to collect emails</li>
<li>Download subscriber list as csv</li>
<li>Social icons</li>
<li>Font Color option</li>
<li>Add title, text message option</li>
<li>Option to exclude page</li>
<li>Custom CSS</li>
</ul>
<h3>Maintenance Page Pro:</h3>
<ul>
<li>Counter</li>
<li>Contact Form</li>
<li>MailChimp integration</li>
<li>Ip Whitelist</li>
<li>Background Slider</li>
<li>Background Video</li>
<li>Progress Bar</li>
<li>Google font option</li>
<li>Analytic Code Option</li>
<li>Role Based access</li>
<li>Font size option</li>
<li>About Page</li>
</ul>
<a href="http://themegrill.com/plugins/maintenance-page-pro/" rel="nofollow ugc">Upgrade to Maintenance Page Pro »</a>
<a href="http://demo.themegrill.com/maintenance-page-pro/" rel="nofollow ugc">View Maintenance Page Pro »</a>

Maintenance Page

Allows you to quickly create a maintenance/coming-soon page. Use this plugin whenever your site is down for maintenance or undergoing development.

Nuoria

Simple Maintenance Mode White Screen is a lightweight WordPress maintenance mode plugin that lets you quickly put your site into maintenance mode with one click. Display a custom coming soon page, under construction notice, or a clean white screen while you update, redesign, or build your WordPress website.
Unlike bloated alternatives, this plugin is fast, simple, and does exactly what you need — no page builders, no subscriptions, no unnecessary features.
Key Features:
<ul>
<li>One-click maintenance mode — Enable or disable maintenance mode instantly from the WordPress admin</li>
<li>Custom maintenance message — Write your own coming soon or under construction text with basic HTML support (bold, italic, links)</li>
<li>Logo upload — Add your brand logo to the maintenance page using the WordPress media library</li>
<li>Background color picker — Customize the maintenance page background color</li>
<li>Text color picker — Choose a text color that matches your brand</li>
<li>Font family selector — Pick from web-safe fonts or use your theme default</li>
<li>Adjustable font size — Set the perfect text size for your maintenance message (10-100px)</li>
<li>Admin bar indicator — A red “Maintenance Mode: ON” badge in the admin bar reminds you when maintenance mode is active</li>
<li>Logged-in users bypass — Administrators and logged-in users can browse the site normally while visitors see the maintenance page</li>
<li>Clean uninstall — All plugin data is removed from the database when you delete the plugin</li>
<li>Translation ready — Fully translatable with included .pot file</li>
</ul>
Perfect for:
<ul>
<li>Putting your WordPress site under maintenance while making updates</li>
<li>Showing a coming soon page while building a new website</li>
<li>Displaying an under construction notice during a site redesign</li>
<li>Temporarily hiding your site from the public with a white screen</li>
</ul>
<h3>License</h3>
This plugin is licensed under the GPL-2.0+ License. See LICENSE for more details.

Simple Maintenance Mode White Screen

Lightweight maintenance mode plugin. Show a coming soon page, under construction notice, or white screen to visitors while you work on your site.

Maintenance Page vs Simple Maintenance Mode White Screen