Antonio Sanchez

Uncomplicated SEO allows you to easily add the most wanted SEO attributes to 
your WordPress site, like Open Graph meta tags used for Facebook and many other 
web services, Twitter Card, description and author metatags, canonical link, etc..
Social sharing buttons can also be added to every post.
It also easily allows you to add the necesary tags to validate your website with 
Google Webmaster Tools, Google Plus and Bing Webmaster Tools, and insert 
scripts/links in header and body (you can use that for Google Anaylitics 
script).
It also allows you to add a custom description (used for the respective 
metatags) to every post and page, directly in the Post/Page Edit Screen.
In a simple formular, you can:
<ul>
<li>Configure and add metatags</li>
<li>Configure and add Open Graph metatags</li>
<li>Configure and add Twitter Card metatags</li>
<li>Add social sharing buttons to your post</li>
<li>Introduce the code for the Google and Bing validations metatags</li>
<li>Insert scripts/links in header and body (For Google Analytics and any other)</li>
<li>Add a favicon</li>
</ul>

Uncomplicated SEO

Uncomplicated SEO allows you to easily add the most wanted SEO attributes to your WordPress site.

Syed Ebraiz Ali Chishti

This is a free plugin for adding meta tag on each post of your website, this meta tags include title, description, image, author, post URL and site name of your published post which later helps while sharing post on social media and for search engines to recognize the post. If you have no featured image on your post, it will also ask for a default image for metadata, which can be set through settings page. Meta tags are invisible from the front-end, but can be viewed from the source code. Meta tags has a great importance in SEO (Search Engine Optimization) and Google Page Rank.
Major features of Add Metadata include:
<ul>
<li>Automatically get post title, description, image, author, url, site name from the post and uses them as a meta tags.</li>
<li>Allow us to set default image for metadata which can use if no featured image found on the post.</li>
<li>Allow us to customize the css and js file.</li>
</ul>
PS: You don’t need any API key or Serial key to use it, because Add meta data are free to use.

Add Metadata

This Plugin adds meta tags on each post of your website and allow us to set default image for metadata, if no featured image found on your post.

Uncomplicated SEO vs Add Metadata