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AddToAny

The Subscribe button helps people subscribe to your blog using any feed reader, such as Feedly, The Old Reader, Yahoo!, AOL, and many more RSS readers.
The button displays AddToAny’s customizable Smart Menu, which places the services visitors use at the top of the menu, based on each visitor’s preferences.
<a href="https://www.addtoany.com/buttons/for/website/subscribe" title="Subscribe button" rel="nofollow ugc">Subscribe Button</a> (standard version)
<ul>
<li>AddToAny Smart Menu</li>
<li>Includes all services</li>
<li>Services updated automatically</li>
<li>WordPress optimized, localized (i18n)</li>
<li>Supports WordPress Multisite Networks (MS)</li>
<li>Many more publisher and user features</li>
</ul>
See also:
<ul>
<li>The <a href="https://wordpress.org/plugins/add-to-any/" title="Share plugin" rel="ugc">Share Buttons</a> plugin</li>
</ul>

Subscribe Button by AddToAny

Help visitors subscribe to your blog using email or any feed reader, such as Feedly, The Old Reader, Yahoo!, AOL, and many more feed services.

Abdul Raouf

This plugin is provide the facility to add the youtube subscribe button in the widgets of the site. So the User visiters can subscribe your youtube channel just by one click.
Requirements:
<ul>
<li>Requires at least: 5.6</li>
<li>Tested up to: 6.4.1</li>
<li>Requires PHP: 7.0</li>
</ul>
<h4>Options you can set</h4>
<ol>
<li>Title of the widget</li>
<li>Youtube Channel ID</li>
<li>Channel layout</li>
<li>Channel Subscribers Counts</li>
</ol>

Subscribe-YouTube-Button

Try it.

This plugin is for add the youtube subscribe button in the widgets of the site. So the User or visiters can subscribe your youtube channel just by one …

Subscribe Button by AddToAny vs Subscribe-YouTube-Button