Ozan Canakli

This plugin allows you to add custom site-wide CSS, JavaScript, Header, Footer Code to your WordPress site. The changes appear instantly on your website with help of WordPress Live Customizer.
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In your WordPress Dashboard, navigate to Customize > Live Code Editor to get started.
When you Change or Update your WordPress Theme, Your Custom Code isn’t effected from these changes.
NEW FEATURES as Version 1.0.5: 
* Add Custom CSS to WordPress Admin dashboard. 
* Add Custom JavaScript to WordPress Admin dashboard.
MAIN FEATURES:
<ul>
<li>Custom CSS code</li>
<li>Custom Javascript code</li>
<li>Custom Header Code (Inside tags)(Google Analytics and Facebook Pixel compatible.)</li>
<li>Custom Footer Code (Before closing tag aka wp_footer function)</li>
<li>See Your Changes Immediately on your WordPress Site</li>
<li>Built in Syntax Code Highlighter</li>
<li>16 Color Schemes (Monokai, Chrome, GitHub, Twilight, Dreamweaver, XCode, Eclipse etc. 8 Light, 8 Dark)</li>
<li>Live Syntax Checking (CSS, JavaScript, HTML)</li>
<li>Syntax Highlighting</li>
<li>Line wrapping</li>
<li>Code folding</li>
<li>Multiple cursors and selections</li>
<li>Handles huge code blocks (four million lines seems to be the limit!)</li>
</ul>
Special thanks to <a href="https://profiles.wordpress.org/justinbusa/" rel="nofollow ugc">Justin Busa</a> of <a href="https://wordpress.org/plugins/beaver-builder-lite-version/" rel="ugc">Beaver Builder</a> for the inspiration.

Live Custom CSS JS Code Editor

Live Custom CSS JS Code Editor allows you to easily add custom CSS, JavaScript, Header, Footer Code to your site, straight from your WordPress Customi …

FRESHFACE

Create custom CSS and JS codes. Delivered with our awesome Conditional Logic, you can easily specify 
where you want to your custom CSS code appear. You can write your CSS and JS codes inside 
nice ACE editor with syntax highlighter.Codes will be still presented, after you change the theme, 
so this is really good way to write CSS adjustments into your theme.

Custom CSS

Although this plugin does what it's supposed to I don't want to keep clicking the "buy pro version" button because it is the same color and exactly below the standard WordPress update button in the Publish metabox.  Putting it in that spot with that color is deceptive, if your plugin is good and useful people will upgrade to pro naturally, you don't need to trick anyone into clicking - this isn't SEO!

Pro version promotion over the top

Worthless. Just trys to force you to buy the 100 version

Worthless as a free app

No way to add ANY custom code, but there is a huge "upgrade to premium" button.

Add custom CSS, JS, PHP, tracking code. Very easy to use!

Live Custom CSS JS Code Editor vs Custom CSS