Yes, Theme YAML is free to use. It is available as a free plugin on WordPress.org.

How many websites use Theme YAML?

Theme YAML has 10 active installations as tracked by WordPress.org.

What are the best Theme YAML alternatives?

Popular alternatives to Theme YAML include Static Site Exporter, SyntaxHighlighter Evolved: Yaml Brush, YAML Custom Fields. You can compare them side-by-side on our comparison pages.

Does Theme YAML work with the latest WordPress?

Theme YAML has been tested up to WordPress 6.3.8. It requires WordPress 5.8+ and PHP 7.4+.

PluginSift

Theme YAML – Use YAML instead JSON for your theme.json settings and styles

Name: Theme YAML – Use YAML instead JSON for your theme.json settings and styles
Rating: 4.5 (2 reviews)
Author: landwire

Theme Yaml converts your theme.yaml file into theme.json so that you can configure your theme with YAML

By landwire·Yaml·Free

4.5(2 reviews)

·10 active installs·Updated 2 years ago

Download Compare

As of April 2026, Theme YAML is a WordPress yaml plugin with 10 active installations and a 4.5/5 rating from 2 reviews. It has been downloaded 1.3K+ times in total. Requires WordPress 5.8+ and PHP 7.4+. Available on WordPress.org since 2022. Last updated 2 years ago — may have compatibility concerns. Top alternative: Static Site Exporter.

4.5/52 reviews

10active installs

1.3K+total downloads

4 yearssince 2022

Overview

Theme Yaml converts your theme.yaml file into theme.json so that you can configure your theme with YAML. It has the benefit of being able to add comments and is more concise than JSON. The generated theme.json is left as a one liner by default, so that you can see it is generated. This however can be changed through the ‘theme_yaml_json_pretty_print’ filter.

The plugin automatically looks for a theme.yaml file in the active theme’s root folder when a page is loaded. If found, it will check its last modified time and store the value in the database. If there are new modifications, the plugin parses theme.yaml, converts it to JSON, and writes it to the theme.json file.

If the active theme is a child, it will also automatically run through this process for its parent.