PluginRx

Simple Maintenance Redirect allows site administrators to enable maintenance mode by redirecting visitors to one of your specified pages (without header and footer) or an external URL instead of complicating things with all kinds of confusing settings. Logged-in administrators can still access the site normally, ensuring a seamless workflow while updates are made.
Features:
<ul>
<li>Custom Maintenance Page: Redirects visitors to a selected WordPress page while the site is in maintenance mode.</li>
<li>Maintenance Page Modifications: Automatically hides the header and footer on the maintenance page and adds a <code>maintenance-mode</code> class to the body element for further customization.</li>
<li>External Redirect Option: Redirect to an external URL instead of a WordPress page if needed.</li>
<li>Admin Bypass: Logged-in administrators can continue working on the site without redirection.</li>
<li>Developer Hook: Modify rules for when a user should be redirected.</li>
</ul>
How It Works:
<ul>
<li>Create and publish a page with your custom maintenance message.</li>
<li>Go to Settings > General and choose a Maintenance Mode Page or enter an External URL.</li>
<li>When enabled, visitors will be redirected to the selected page or URL. Logged-in administrators can still access the site.</li>
<li>The plugin does not affect the login page, REST API, or JSON endpoints.</li>
</ul>
This plugin is great for “coming soon” pages, staging site protection, design previews, or any situation where you need to hide the main site while keeping access for yourself.
<h3>Demo</h3>
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Simple Maintenance Redirect

Easily redirect visitors to a maintenance mode page or external URL while keeping access for logged-in administrators.

netfett

The maintenance mode only puts the WooCommerce Shop into maintenance mode, but not your entire website. Decide for yourself which text or content should be displayed.
Possible reason for the “Coming soon” mode: 
Your shop is not quite finished yet, but you want to show your visitors that a shop is about to open on your website.
Possible reason for the “maintenance mode”: 
You made an error while configuring or maintaining your products, and you can’t find the error right away. Then switch your shop to “maintenance mode” and take your time to correct the error.
And the best thing is: it’s free! 
Yes, it’s absolutely free. There is no premium version.

Maintenance mode for WooCommerce

Does what it says and is easy

Maintenance mode for the Woocommerce Shop

Simple Maintenance Redirect vs Maintenance mode for WooCommerce