alphasis

<p>This Plugin will display the related posts list via categories.<br />
It can automatically display the related posts list after the content of any single post of selected post types by options.<br />
There are many options for the display, order, exclusion and post-type selection.<br />
This plugin works when viewing a post of selected post types by options.<br />
This plugin requires jQuery 1.6 or higher.</p>
<h4>Official Page</h4>
<ul>
<li>Plugin’s Official Page : <a href="http://alphasis.info/developments/wordpress-plugins/related-posts-via-categories/" title="Plugin's Official Page in English" rel="nofollow ugc">English</a> / <a href="http://alphasis.info/kaihatu/wordpress-plugins/related-posts-via-categories/" title="Plugin's Official Page in Japanese" rel="nofollow ugc">Japanese</a></li>
<li>Author’s Website : <a href="http://alphasis.info/" title="alphasis.info" rel="nofollow ugc">alphasis.info</a> (Japanese) » <a href="http://alphasis.info/developments/wordpress-plugins/" title="WordPress Plugins" rel="nofollow ugc">WordPress Plugins</a> (English)</li>
</ul>
<h4>Related Posts via Categories – Options</h4>
<p>‘Settings’ » ‘Related Posts via Categories’</p>
<h4>Display</h4>
<ul>
<li>Auto display
<ul>
<li>This option automatically displays related posts after the content on the single post page.</li>
<li>If this option is off, you will need to manually insert <code>display_related_posts_via_categories()</code> into your theme files.</li>
</ul>
</li>
<li>Maximum number of related posts
<ul>
<li>If you do not enter anything: 10</li>
</ul>
</li>
<li>Related posts title
<ul>
<li>For example: Related Posts</li>
</ul>
</li>
<li>Before related posts title and related posts
<ul>
<li>For example: <code><div id="related-posts-via-categories"></code></li>
</ul>
</li>
<li>After related posts title and related posts
<ul>
<li>For example: <code></div></code></li>
</ul>
</li>
<li>Before related posts title
<ul>
<li>For example: <code><h2 id="related-posts-via-categories-title"></code></li>
</ul>
</li>
<li>After related posts title
<ul>
<li>For example: <code></h2></code></li>
</ul>
</li>
<li>Before related posts
<ul>
<li>For example: <code><ul id="related-posts-via-categories-list"></code></li>
</ul>
</li>
<li>After related posts
<ul>
<li>For example: <code></ul></code></li>
</ul>
</li>
<li>Before each related post
<ul>
<li>For example: <code><li class="related-posts-via-categories-item"></code></li>
</ul>
</li>
<li>After each related post
<ul>
<li>For example: <code></li></code></li>
</ul>
</li>
</ul>
<h4>Order</h4>
<ul>
<li>Order By
<ul>
<li>Related Scores : High  ( Speedy ) </li>
<li>Related Scores : High / Date Published : New ( Default setting )</li>
<li>Related Scores : High / Date Published : Old</li>
<li>Related Scores : Low / Date Published : New</li>
<li>Related Scores : Low / Date Published : Old</li>
<li>Related Scores : High / Date Modified : New</li>
<li>Related Scores : High / Date Modified : Old</li>
<li>Related Scores : Low / Date Modified : New</li>
<li>Related Scores : Low / Date Modified : Old</li>
<li>Date Published : New</li>
<li>Date Published : Old</li>
<li>Date Modified : New</li>
<li>Date Modified : Old</li>
</ul>
</li>
</ul>
<h4>Exclude</h4>
<ul>
<li>Exclude (Posts)
<ul>
<li>The IDs of any posts you want to exclude, separated by commas.</li>
</ul>
</li>
<li>Exclude (Categories)
<ul>
<li>Select checkboxes of any categories you want to exclude.</li>
</ul>
</li>
</ul>
<h4>Post types</h4>
<ul>
<li>Select checkboxes of any post types you want to include in the list of Related Posts and display the list.</li>
<li>Displays checkboxes of them when there is any custom post types.</li>
</ul>
<h4>Localization</h4>
<ul>
<li>Japanese (ja) – <a href="http://alphasis.info/" title="alphasis.info" rel="nofollow ugc">alphasis</a> (plugin author)</li>
<li>Persian (fa_IR) – <a href="http://qanal.ir/" title="Omid Sheerkavand" rel="nofollow ugc">Omid Sheerkavand</a></li>
<li>Armenian (hy_AM) – <a href="http://ablog.gratun.am" title="Artak Kolyan" rel="nofollow ugc">Artak Kolyan</a></li>
<li>Current release supports English, Persian, Armenian and Japanese.</li>
</ul>


David Miller

<p>Similarity displays a list of posts similar to the current post with similarity being determined based on tags, categories, or both. The display of the list is fully customizable including the ability to display the strength of the similarity as a value, percentage, color, or custom text/code. Another option allows for a less related post to be randomly selected and appended to the list. The list can be limited by one or both of a numerical limit or (as of version 2.1) match strength.</p>
<p>This plugin is translation ready and comes with English (U.S.), French, Polish, German, italian, and Spanish translations. Thanks to Li-An (http://li-an.fr/blog/) for providing the French translation. Thanks to Krzysztof Kudlacik (http://born66.net/) for providing the Polish translation. Thanks to Bjoern Buerstinghaus (http://www.buerstinghaus.net/) for providing the German, Italian and Spanish translations.</p>
<p>Prior to Version 1.6 private posts would potentially show in the list of related posts. In 1.6 these were skipped. As of version 1.7 private posts will show for the post author or others with the ability to read private posts. It is strongly recommended that users who have private posts install version 1.6 or higher.</p>
<p>The plugin allows for three function calls anywhere in your page templates (all use the same options):</p>
<ul>
<li><code><?php sim_by_tag(); ?></code> – determines similarity based on the tags applied to the posts</li>
<li><code><?php sim_by_cat(); ?></code> – determines similarity based on the categories assigned to the posts</li>
<li><code><?php sim_by_mix(); ?></code> – determines similarity based on the tags and categories assigned to the posts</li>
</ul>
<p>There are also three function calls that are better suited for use in sidebars (specifically when the sidebar is used on the main page)</p>
<ul>
<li><code><?php sim_by_tag_multi(); ?></code> – determines similarity based on the tags applied to the first post on milti-post pages</li>
<li><code><?php sim_by_cat_multi(); ?></code> – determines similarity based on the categories assigned to the first post on milti-post pages</li>
<li><code><?php sim_by_mix(_multi); ?></code> – determines similarity based on the categories and tags assigned to the first post on milti-post pages weighting each according to the ratio you assign</li>
<li>To display a Similarity list as a widget use a text widget with one of the following shortcodes – <code>[SIM-BY-TAG]</code> <code>[SIM-BY-CAT]</code> <code>[SIM-BY-MIX]</code> for single post pages only or for all pages use <code>[SIM-BY-TAG-MULTI]</code> <code>[SIM-BY-CAT-MULTI]</code> or <code>[SIM-BY-MIX-MULTI]</code></li>
<li>To display a Similarity list without altering your templates simply select the function that you would like to auto-display at the bottom of the options page.</li>
</ul>


Similarity

Similarity displays a list of posts similar to the current post with similarity being determined based on tags, categories, or both.

Related Posts via Categories vs Similarity