Critter

Critter is a Craft CMS plugin that automates the generation and inlining of Critical CSS for improved frontend performance. It integrates with the criticalcss.com API out of the box and includes support for CLI-based or custom generators, giving you flexibility across staging, development, and production environments. Critical CSS is generated in the background via queued jobs, and the plugin handles retries, failure states, and cache integration cleanly.

Designed with real-world implementation in mind, Critter supports per-entry or per-section generation modes, per-section configuration, and optional manual rendering. It includes native integration with the Blitz static caching plugin, allowing you to expire or refresh cached pages when critical CSS updates. The plugin is extensible via events, with support for custom generators and cache drivers, making it a solid choice for teams who want performance gains without compromising control.