Hide your site behind a really simple Under Construction page. Bypass with a secret-word URL or an IP whitelist for testing.

Jonas Hjalmarsson

Version 1.5.0 is a recommended security update for all existing users. It blocks JavaScript injection on the Under Construction page, hardens the bypass cookie (Secure/HttpOnly/SameSite), tightens IP-whitelist validation, and fixes silent breakage with WP-CLI, cron, and the REST API. The plugin’s behavior and settings are unchanged — existing setups upgrade in place. See the changelog for the full list.
Add a really simple Under Construction page to your website by enabling this plugin. Use IP whitelisting and a secret URL to grant access to selected users without logging in.
Go to the settings page in Settings > Really Simple Under Construction. Enable by checking the checkbox. The Under Construction page is only visible to visitors who are not logged in. You can optionally configure:
<ol>
<li>The Under Construction page itself — paste any HTML (DOCTYPE, <style>, <body> etc. are supported, scripts are stripped).</li>
<li>A secret word that lets you bypass the page via a URL like <code>?yoursecret</code>. A cookie is then stored so the same browser keeps access.</li>
<li>The lifetime of that cookie, in days.</li>
<li>A list of IP addresses to whitelist for users and services that should always see the real site.</li>
</ol>

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