Josh Pollock

Use this plugin to create a demo site for your themes, or use it to allow users to customize the presentation of your site.
The JP Theme Bar Plugin adds a theme switching bar to the bottom of your site, perfect for theme preview sites. The settings page for the plugin lets the end user choose which themes to add, as well as set the colors for the theme bar. You can see it in action on this site.
New in version 0.0.3 -> Themes will update theme mods when changing themes allowing for individual theme settings to be previewed properly.
This plugin is based on the <a href="http://iainjmccallum.com/wordpress/live-demo-theme-bar/" rel="nofollow ugc">IJM Theme Switcher Bar v2.0</a> by <a href="http://www.iainjmccallum.com/" rel="nofollow ugc">Iain J McCallum</a>
IMPORTANT- The plugin <a href="https://wordpress.org/plugins/theme-test-drive/" rel="ugc">Theme Test Drive</a> by <a href="http://www.prelovac.com/vladimir/" rel="nofollow ugc">Vladimir Prelovac</a> must be installed and activated in order for the theme switching to work.

JP Theme Switcher Bar

Adds a theme switcher/ theme demo bar to the bottom of your site to allow users to switch the theme they see on your site.

bartosznowak

kamiljanq

rainkom

tomziel

Osom Studio WordPress and WooCommerce Agency

Osom Multi Theme Switcher lets you run multiple WordPress themes on a single site — assigning different themes to specific pages, posts, post types, categories, tags, or custom URLs.
Built by <a href="https://www.osomstudio.com" rel="nofollow ugc">Osom Studio</a>, a WordPress & WooCommerce agency with 10+ years of experience managing complex multi-theme setups for clients.
We built this plugin because we kept solving the same problem for clients: one WordPress installation, multiple designs. Landing pages that need a completely different look. A WooCommerce store that runs a separate theme from the corporate site. A membership area with its own design system.
Instead of hacking theme conditionals into functions.php every time, we packaged our solution into a plugin.
<h4>When you need this</h4>
<ul>
<li>Landing pages with a unique design — without touching your main theme</li>
<li>WooCommerce stores running a dedicated shop theme alongside a corporate theme</li>
<li>Membership or gated sections with a separate visual identity</li>
<li>Theme testing — preview a new theme on specific pages before switching site-wide</li>
<li>Agencies managing multi-brand WordPress installations from a single dashboard</li>
</ul>
<h4>Key features</h4>
<ul>
<li>Flexible rules — assign themes by page, post, post type, custom URL, category, or tag</li>
<li>Full theme loading — the alternative theme’s functions.php loads completely, so page builders (Elementor, Divi, Beaver Builder) and custom functionality work as expected</li>
<li>Admin theme switcher — access settings for any installed theme directly from the admin bar</li>
<li>Per-user admin theme — each administrator can use their preferred dashboard theme independently</li>
<li>Draft & scheduled support — apply themes to unpublished content for preview and staging</li>
<li>REST API support — configure custom REST API prefixes per theme</li>
<li>ACF compatible — loads Advanced Custom Fields JSON from all active theme directories</li>
<li>No code required — set up everything through the WordPress admin panel</li>
</ul>
<h4>How it works</h4>
<ol>
<li>Install and activate the plugin</li>
<li>Go to Appearance > Theme Switcher</li>
<li>Select a rule type (Page, Post, Post Type, Category, Tag, or Custom URL)</li>
<li>Choose the content to target</li>
<li>Pick the alternative theme</li>
<li>Click Add Rule — changes apply immediately</li>
</ol>
The plugin hooks into WordPress on the <code>setup_theme</code> action, before any theme code runs. This ensures full compatibility with theme features, widgets, customizer settings, and page builders.

Osom Multi Theme Switcher

Use different themes for specific pages, posts, or URLs while keeping your main theme active site-wide.

JP Theme Switcher Bar vs Osom Multi Theme Switcher