Osom Multi Theme Switcher

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 Osom Studio, 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.

When you need this

• Landing pages with a unique design — without touching your main theme
• WooCommerce stores running a dedicated shop theme alongside a corporate theme
• Membership or gated sections with a separate visual identity
• Theme testing — preview a new theme on specific pages before switching site-wide
• Agencies managing multi-brand WordPress installations from a single dashboard

Key features

• Flexible rules — assign themes by page, post, post type, custom URL, category, or tag
• Full theme loading — the alternative theme’s functions.php loads completely, so page builders (Elementor, Divi, Beaver Builder) and custom functionality work as expected
• Admin theme switcher — access settings for any installed theme directly from the admin bar
• Per-user admin theme — each administrator can use their preferred dashboard theme independently
• Draft & scheduled support — apply themes to unpublished content for preview and staging
• REST API support — configure custom REST API prefixes per theme
• ACF compatible — loads Advanced Custom Fields JSON from all active theme directories
• No code required — set up everything through the WordPress admin panel

How it works

1. Install and activate the plugin
2. Go to Appearance > Theme Switcher
3. Select a rule type (Page, Post, Post Type, Category, Tag, or Custom URL)
4. Choose the content to target
5. Pick the alternative theme
6. Click Add Rule — changes apply immediately

The plugin hooks into WordPress on the setup_theme action, before any theme code runs. This ensures full compatibility with theme features, widgets, customizer settings, and page builders.