Marcus Downing

Add page-specific widget areas to templates with a <code>Sidebars:</code> header:
<pre><code><?php
/*
Template Name: Photos template
Sidebars: notes (Photo Notes)
*/
...
</code></pre>
Use these sidebars the normal way:
<pre><code>dynamic_sidebar('notes');
</code></pre>
At present this only works on Pages.

Post-Specific Widgets

Add page-specific widget areas to templates with a Sidebars: header:

Brainstorm Force

Normally you have a sidebar that appears throughout the website. However, sometimes it is necessary to display a relevant, different sidebar on certain pages on the website. For an example: on WooCommerce pages, a sidebar with related or top seller products would be more relevant than the latest comments, blog posts right?
This plugin helps you solve that problem as it allows you to create new sidebars and display them conditionally on certain locations of the website easily. Once the sidebar is created and displayed on pages you like, you can add relevant widgets in it.
<a href="https://bsf.io/sidebar-manager-demo" rel="nofollow ugc">Try it out on a free dummy site</a>
Some of the Features:
<ol>
<li>Create unlimited sidebars</li>
<li>Place them any location your theme has defined (Footer Widgets / Left or Right Sidebar)</li>
<li>Works with any theme</li>
<li>Conditionally display sidebars on specific posts, pages, taxonomies or custom post types</li>
<li>Display sidebars based on user roles</li>
</ol>

Lightweight Sidebar Manager

Create new sidebar areas and display them conditionally on certain pages. Works with all themes.

Post-Specific Widgets vs Lightweight Sidebar Manager