JS Morisset

Includes a 5 Star Rating in Schema markup:
<ol>
<li>If the Schema markup does not have an ‘aggregateRating’ property.</li>
<li>If Google allows an ‘aggregateRating’ property for that Schema type.</li>
</ol>
Google allows an ‘aggregateRating’ property for these Schema types and their sub-types:
<ul>
<li>Book</li>
<li>Course</li>
<li>Event</li>
<li>HowTo (includes Recipe)</li>
<li>LocalBusiness</li>
<li>Movie</li>
<li>Product</li>
<li>SoftwareApplication</li>
</ul>
If the Schema type in the Document SSO metabox is not one of these types (or one of their sub-types), then a 5 star rating cannot be added, as doing so would trigger an error in the Google search console. <a href="https://developers.google.com/search/docs/advanced/structured-data/review-snippet" rel="nofollow ugc">See Google’s Review snippet documentation for additional information.</a>

<h3>WPSSO Add Five Stars is a Fallback Solution</h3>
The Google’s Review Snippet technical guidelines reminds us to:
<blockquote>
<a href="https://developers.google.com/search/docs/advanced/structured-data/review-snippet#technical-guidelines" rel="nofollow ugc">Make sure the reviews and ratings you mark up are readily available to users from the marked-up page. It must be immediately obvious to users that the page has review content.</a>
</blockquote>
The WPSSO Add Five Stars add-on includes a 5 star rating if the document Schema markup does not already have an ‘aggregateRating’ property. It is always preferable to include actual ratings and reviews from your visitors and/or customers in the webpage. The WPSSO Add Five Stars add-on can be used in combination with any of the following third-party plugins and service APIs, or the <a href="https://wordpress.org/plugins/wpsso-ratings-and-reviews/" rel="ugc">WPSSO Ratings and Reviews</a> add-on.
Suggested Rating and Review Plugins and Services:
The <a href="https://wordpress.org/plugins/wpsso/" rel="ugc">WPSSO Core plugin</a> supports a selection of plugins that provide ratings and reviews:
<ul>
<li>WP-PostRatings</li>
<li>WP Product Review</li>
<li>Yotpo Social Reviews for WooCommerce</li>
<li>WooCommerce</li>
<li><a href="https://wordpress.org/plugins/wpsso-ratings-and-reviews/" rel="ugc">WPSSO Ratings and Reviews</a></li>
</ul>
The <a href="https://wpsso.com/" rel="nofollow ugc">WPSSO Core Premium plugin</a> also supports a selection of remote service APIs that provide ratings and reviews:
<ul>
<li>Judge.me (Ratings and Reviews)</li>
<li>Shopper Approved (Ratings and Reviews)</li>
<li>Stamped.io (Ratings and Reviews)</li>
</ul>
<h3>WPSSO Core Required</h3>
WPSSO Add Five Stars is an add-on for the <a href="https://wordpress.org/plugins/wpsso/" rel="ugc">WPSSO Core plugin</a>, which creates extensive and complete structured data to present your content at its best for social sites and search results – no matter how URLs are shared, reshared, messaged, posted, embedded, or crawled.

WPSSO Add Five Stars for Google Rich Snippets

Add a 5 star rating and review from the site organization if the Schema markup does not already have an 'aggregateRating' property.

jitendravaswani

What is a Rich Snippet? 
Rich Snippets is the term used to describe structured data markup that site operators can add to their existing HTML, which in turn allow search engines to better understand what information is contained on each web page. See example on our blog : <a href="http://www.bloggersideas.com/how-to-make-product-review-site-with-wordpress-to-make-money/" rel="nofollow ugc">Usage of SchemaNinja</a> 
How does a Rich Snippet help? 
It gives search engines only the important & precise information to display in search result snippets.
Rich Snippets are very interactive (photos, star ratings, price, author, etc.) to let you stand out from competition on SERP�s. There are high chances that users will click more on Schema results than non schema results. 
Supported Content Types – 
This plugin suppojitendra.coowing types of Schemas: * Review * Product * Software Application * Video * Articles 
Future release would include – 
More pro recommendations features in SchemaNinja new version.
We Follow Google Standards 
This plugin is modeled and will be updated according to Google guidelines that you will find here: https://developers.google.com/structured-data/
You can validate structured data on any web page here: https://developers.google.com/structured-data/testing-tool/ 
For more information about the plugin author visit:
<a href="https://www.bloggersideas.com" rel="nofollow ugc">Jitendra Vaswani</a> 
<a href="https://twitter.com/JitendraBlogger" rel="nofollow ugc">Twitter</a>
<h3>Arbitrary section 1</h3>

Schema Ninja

Schemaninja is one of the finest schema rating & recommendation plugin I have seen in wordpress directory. Plugin is neat and clean and I particularly like the design of the plugin. I would recommend schemaninja for schema rating plugin. Do try it out and you will love it like Ninja. 

Best Schema Rating Plugin

SchemaNinja Rich Snippets & Recommendation plugin.  SchemaNinja can Boost CTR, Improve SEO & Rankings. Supports most of the content type.

WPSSO Add Five Stars for Google Rich Snippets vs Schema Ninja