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SimpleDocs – Simple Documentation and Knowledge Base makes it easy to create, organize, and display documentation on your WordPress site. Whether you’re building a help center, knowledge base, or user guide, this lightweight plugin handles it all with minimal configuration.
<h3>Key Features</h3>
<ul>
<li>Auto-generates a <code>documents</code> custom post type – No setup needed.</li>
<li>Auto-creates <code>doc-type</code> taxonomy – Categorize and organize documents easily.</li>
<li>Prebuilt archive page with a clean card layout.</li>
<li>Custom sidebar injection on single document pages – replaces your theme sidebar automatically (make sure the sidebar is enabled in your theme layout settings).</li>
<li>Full support for block (FSE) themes – Automatically generates archive and single templates.</li>
<li>Templates regenerate after theme switches – No reconfiguration needed.</li>
<li>Redirects doc-type archive pages to the first listed document in that category.</li>
<li>Smart archive queries – Uses native WordPress loops, preserving your theme features.</li>
<li>Ultra-lightweight CSS – Only loads minimal styles, scoped to doc pages.</li>
<li>Modern CSS only, no JavaScript – Fast loading, less conflict.</li>
<li>Responsive grid layout on archive pages – Auto-applied even if your theme uses flex.</li>
<li>
Only 4 CSS variables used for coloring:
`css 
:root { 
–simpledocs-accent-color: #2872fa; 
–simpledocs-link-color: #555; 
–simpledocs-border-color: #eee; 
–simpledocs-background-color: #fff; 
}
</li>
</ul>
Use your theme’s Customizer or global styles to override them easily.
<h3>Shortcodes</h3>
<pre><code>[simpledocs_archive] — Displays the document archive

[simpledocs_navigation] — Displays navigation links for documents
</code></pre>
Use these shortcodes if you’re manually creating templates or using a page builder.
<h3>Support</h3>
For help, feature requests, or bug reports, please contact the plugin author or visit the support forums.
<h3>Privacy</h3>
This plugin does not collect or transmit personal data. All content is stored locally within your site.

SimpleDocs – Documentation and Knowledge Base

A powerful, theme-friendly documentation system that works out of the box—no bloat, no JS, just clean, structured, and styled docs.

WP HelpKit

Create, Organize and Publish help content.
A simple tool for creating Knowledge Base and Documentation sites 
for your software products.
HelpKit for documentation sites 
is what WooCommerce is for eCommerce sites.
<h3>What can I do with HelpKit?</h3>
<ul>
<li>Help Center / Support Sites</li>
<li>Knowledge Base</li>
<li>Documentation</li>
<li>User Manuals</li>
<li>Wiki</li>
<li>FAQs</li>
</ul>

WPHelpKit

We've just started using it to document our WooCommerce themes and it seems to be exactly what we were looking for.

Exactly what we need

Create a fully featured Help Center site (Knowledge Base, Documentation, Wiki, FAQs) with WordPress.

SimpleDocs – Documentation and Knowledge Base vs WPHelpKit