Ariana

This is a very simple plugin that adds a “robots” meta tag to the head of your site with “noindex” in it.
The effect of the noindex robots meta tag is that search engines will not index your pages and posts at all. 
This is a better solution then the wordpress default settings option, which tells search engines to not crawl the URLs in the robots.txt. Because Google (and other search engines) sometimes still index URLs they haven’t crawled, for which they determine relevancy based on anchor text of links which lead to the specific URL.

Simple Noindex

chrisguitarguy

George Pattichis

WordPress, by default, includes a simple robots.txt file that’s dynamically generated from within the WP application. This is great, but how do you easily change the content?
Enter WP Robots Txt, a plugin that adds an additional field to the “Reading” admin page where you can do just that. No manual coding or file editing required!
Simply visit https://your-site.com/wp-admin/options-reading.php and you can control the contents of your https://your-site.com/robots.txt
<a href="https://wordpress.org/plugins/wp-robots-txt/#developers" rel="ugc">Changelog</a>

WP Robots Txt

WP Robots Txt Allows you to edit the content of your robots.txt file.

Simple Noindex vs WP Robots Txt