CaphLabs

ThumbsUp or Down Reactions (TUOD) is a clean, fast, and fully customizable WordPress plugin that allows visitors to express feedback on your content with a simple thumbs up 👍 or thumbs down 👎.
Packed with options but easy to use, TUOD works on any post type, includes per-IP voting protection, AJAX-based voting (no reloads), and customizable labels, colors, sizes, and optional glowing effects.
🧪 Live Demo: <a href="https://www.hotspringsofbc.ca" rel="nofollow ugc">hotspringsofbc.ca</a>
💎 Pro version coming soon: Upload your own icons, advanced styling, per-user voting, analytics, and more!
TUOD is built for creators, bloggers, ecommerce shops, and developers who want simple, stylish user interaction with zero bloat.
<h3>Features</h3>
<ul>
<li>👍👎 Thumbs up/down voting on posts, pages, and products</li>
<li>💬 Customizable labels like “Liked this spring” or “Didn’t like this article”</li>
<li>🎨 Choose your own color and vote count text</li>
<li>🔒 One vote per post per visitor (IP-based)</li>
<li>🔁 Users can change their vote at any time</li>
<li>⚡ AJAX-based voting — no page reload</li>
<li>🧮 Total vote tracker shown in admin settings</li>
<li>📱 Fully responsive and mobile-friendly</li>
<li>🖼️ Icon display and thumb glow effects</li>
<li>🎛️ Lightweight and intuitive admin options</li>
<li>🧰 Cleanly coded and developer-friendly</li>
</ul>
<h3>License</h3>
This plugin is licensed under the GPLv2 or later.

ThumbsUp or Down Reactions

A lightweight and customizable thumbs up/down reaction plugin. Easily track likes and dislikes on any post, page, or custom post type.

Flipeleven

Enables a simple like/unlike feature to be added to posts, pages, etc. There is no dislike feature. You are expected to style it however you like so it matches your theme; it has none of its own CSS. There is also no admin page or options for this plugin.
Add the like button to your template using the included PHP function:
<pre><code><?php post_likerator(); ?>
</code></pre>
By default it will use the current post ID and echo the like button’s markup. You can change this by passing (integer) Post ID and (boolean) echo arguments to the function:
<pre><code><?php $like_button = post_likerator(2501, false); ?>
</code></pre>
The above will attribute likes to post ID <code>2501</code> and will assign the string of markup to the <code>$like_button</code> variable instead of echoing it.
Once you’ve got it looking awesome, click to like the post. Clicking again will unlike it. You can go back and forth as much as you want, but it will probably get boring after a little while.

Post Likerator

Simple like/unlike function for posts. No dislikes. Bring your own CSS.

ThumbsUp or Down Reactions vs Post Likerator