dcannon1

Small, lightweight (under 7k) widget that shows posts from the same category as the current post. Several options for customization along with numerous ordering criteria for posts. Displayed only on single post pages. Based on Related Links by Category by Andrew Stephens
Options
<ul>
<li>Title – Set the title of the widget (or leave blank)</li>
<li>Number of Posts to Show – Set how many posts are listed in the widget</li>
<li>Order By – Choose how the related posts will be ordered (including random posts)</li>
<li>Show Category Names – Toggle whether category names are displayed above groups of posts</li>
<li>Link Cat Name to Archive – If category names are being shown, choose to have them link to the category archive page for that category</li>
<li>List Posts Multiple Times? – If a post is classified under multiple categories use this toggle to determine if it will be shown under each category, or only under the first category it shares with the current post. This should be set to no if you are not displaying the category names</li>
</ul>

shareaholic

Similar Posts displays a list of posts that are similar or related to the current posts. The list can be customised in many ways. Similarity is judged according to a post’s title, content, and tags and you can adjust the balance of factors to fit your own site.
Few Notable Options
<ul>
<li>complete control over the display & layout of displayed posts</li>
<li>over 30 tags for display template customization</li>
<li>matching of current post’s category, tags, content and author</li>
<li>post excluding by author, ID, category, tags and custom fields</li>
<li>output in posts, widgets and RSS</li>
<li>over 50 options available</li>
</ul>
If you need a plugin that does all the Related Posts compute processing in the cloud, please check out our other <a href="https://shrlc.com/yPInQlI" rel="nofollow ugc">Related Posts & Products WordPress plugin</a>.
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Related Posts by Category Widget vs Similar Posts – Best Related Posts Plugin for WordPress