Mikael Korpela

Miguel Lezama

A tool to observe how a page loads in different themes simultaneously. 
Useful for debugging plugins or Gutenberg blocks.
How to Use:
<ol>
<li>Install several themes you’d like to check out.</li>
<li>Create a new page.</li>
<li>Navigate to Tools → Back To The Theme</li>
<li>Choose if you want to demo editor- or view side.</li>
<li>Select the themes you’d like to check out.</li>
<li>Choose the page you just created. This page will be previewed with all the themes you’ve selected.</li>
<li>Click Do it!.</li>
<li>Scroll to see the page rendered with all the themes you selected.</li>
</ol>
You’ll see your page load with different themes in a bunch of iframes for handy preview and debugging.
A nice list of popular themes to test:
<pre><code>`
</code></pre>
wp theme install \ 
 astra \ 
 colormag \ 
 customizr \ 
 generatepress \ 
 hestia \ 
 hueman \ 
 oceanwp \ 
 shapely \ 
 storefront \ 
 sydney \ 
 twentyeleven \ 
 twentyfifteen \ 
 twentyfourteen \ 
 twentynineteen \ 
 twentyseventeen \ 
 twentysixteen \ 
 twentyten \ 
 twentythirteen \ 
 twentytwelve \ 
 vantage 
 `
See docs for <a href="https://developer.wordpress.org/cli/commands/theme/install/" rel="nofollow ugc">wp theme install</a>.
<a href="https://github.com/simison/back-to-the-theme" rel="nofollow ugc">Plugin’s source code on GitHub</a>.

Back To The Theme

See a page with different themes all at once, just like that!

Dougal Campbell

By default, the only way to see how a new theme looks on your site is to 
activate it, making it visible to everyone who visits. With this plugin, it 
is possible to view how a new theme looks without activating it.
<h3>TODO</h3>
Possible future enhancements:
<ul>
<li>Add an options screen.</li>
<li>Allow choice of theme to preview from a known list of installed themes.</li>
<li>Provide persistent previews by setting a cookie.</li>
<li>Restrict preview ability by user Roles/Capabilities.</li>
<li>Child-theme friendliness.</li>
</ul>
<h3>Notes</h3>
May not work properly with child themes. This is because it will not be able 
to inherit from the parent theme as it normally would.

Theme Preview

Allows you test how a theme looks on your site without activating it.

Back To The Theme vs Theme Preview