Kenyatta

PressCode provides the best and easiest way to add custom code to your WordPress site… without the need for cumbersome plugin creation. While targeted at developers this plugin aims to simplify the process of writing code for your site by allowing code to be written directly from within WP Admin.
<h4>Key Features</h4>
<ul>
<li>Add code to your website from directly within WP Admin</li>
<li>Support for common WordPress development languages</li>
<li>Capture revisions of your code with support for rolling back to previous versions </li>
<li>Include custom CSS and JS on only specific pages/posts</li>
<li>Easy to use</li>
<li>FREE! 😀</li>
</ul>
<h4>Supported Languages</h4>
<ul>
<li>CSS</li>
<li>JavaScript</li>
<li>PHP</li>
</ul>

PressCode

The best and easiest way to add custom code to your WordPress site.

SOGO

Tested with Gutenberg
Create a simple way to add javascript code to individual page post or custom post type header and footer, 
for example: add conversion code to thank you pages 
add google re-marketing code to individual pages 
and much more… 
added in version 1.3 the option to add script \ style to all pages not only individual pages, 
 this will allow you to add Google re-marketing code to the entire site or Google Analytics 
 to use it goto “settings” – “Header Footer Settings”
New Features (version 3.0): 
Added option for terms / category pages
New Features (version 2.3): 
 Added support for WooCommerce shop page.
<ol>
<li>
we support now exclude individual pages form printing the header and footer scripts, this is supported by 2 checkboxes in each page\post 
buy check it the script will not be display on this page
</li>
<li>
we added support to limit the script only for certain post type \ page
</li>
</ol>
if you like it \ use it – please rate us.
usage: 
You need to paste the code with the script tag, for example: 
 you js code

SOGO Add Script to Individual Pages Header Footer

Simple plugin to add script to header and footer for individual pages & posts

PressCode vs SOGO Add Script to Individual Pages Header Footer