Vito Tardia

<p>With Simple SEO you can set your custom content for the “keywords” and “description” meta tags in each post or page using the standard WordPress metabox interface.</p>
<p>You can also set default values for each meta tag which will be displayed in all your pages, although this is not a SEO best practice.</p>
<h4>Available languages</h4>
<ul>
<li>English</li>
<li>Italian</li>
<li>Romanian by Web Geek Science (<a href="http://webhostinggeeks.com/" rel="nofollow ugc">Web Hosting Geeks</a>)</li>
<li>Serbo-Croatian by Borisa Djuraskovic (<a href="http://www.webhostinghub.com/" rel="nofollow ugc">Webhostinghub</a>)</li>
<li>Ukrainian by Michael Yunat (<a href="//getvoip.com/blog" rel="nofollow ugc">http://getvoip.com</a>)</li>
<li>Indonesian by Jordan Silaen (<a href="//chameleonjohn.com" rel="nofollow ugc">http://chameleonjohn.com</a>)</li>
</ul>
<h3>Manual Database Update</h3>
<p>In order to update your database you can run the following queries using your favorite MySQL admin tool, changing your table prefix if needed (a backup is strongly recomended).</p>
<pre><code>UPDATE wp_postmeta SET meta_key = '_sseo_meta_keywords' WHERE meta_key = 'meta_keywords';

UPDATE wp_postmeta SET meta_key = '_sseo_meta_description' WHERE meta_key = 'meta_description';
</code></pre>


Simple SEO Pack

Simple SEO is a quick way to add HTML meta tags to your site and pages using WP integrated custom fields feature.

JS Morisset

<p></p>
<p><strong>Extends the WordPress REST API post, term, and user query results:</strong></p>
<ul>
<li>The <code>html</code> array includes HTML formatted meta tags and Schema JSON-LD (aka LD+JSON) scripts, as they appear in the webpage head section.</li>
<li>The <code>json</code> array provides Schema JSON-LD (aka LD+JSON) scripts in their decoded format.</li>
<li>The <code>parts</code> array offers meta tag attributes (aka “the parts”) as arrays, making it easier to find and use specific meta tag values.</li>
</ul>
<p>There is no add-on settings page for this plugin – simply install and activate the plugin.</p>
<p></p>
<h3>WPSSO Core Required</h3>
<p>WPSSO REST API 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.</p>

WPSSO REST API

Extends the WordPress REST API post, term, and user query results with an array of meta tags and Schema JSON-LD markup.

Simple SEO Pack vs WPSSO REST API