PageSpeed.PRO publishes free optimization tools under the name Style.Tools.

1. browser-widget - DevTools for frontend optimization (FEO).
2. $async - Professional async CSS and script loader.
3. $lazy - Professional lazy loader and in-view callback.
4. Critical CSS generator - A PostCSS based critical CSS generator with Puppeteer-like browser control that can achieve 100% accuracy.
5. Unused CSS remover - Advanced unused CSS extractor & remover.
6. Duplicate CSS remover - Duplicate CSS remover.

Documentation is available on docs.style.tools.

DevTools for frontend optimization (FEO)

The Style.Tools project started as a free browser-widget that provides a sort of DevTools (developer tools) for frontend optimization (FEO).

Style.Tools is available with 1 click on any page on the internet, including pages behind a login.

Start Style.Tools🔬 FEO

The Style.Tools widget provides many state of the art optimization tools, including:

1. CSS editor with themes
2. Critical CSS generator
3. Unused CSS extractor and remover
4. Duplicate CSS remover
5. CSS beautify
6. CSS code optimization (clean-css)
7. CSS code repair (fix malformed CSS)
8. CSS lint (quality checks)
9. CSS statistics (analysis)
10. PostCSS plugins: autoprefixer and many more
11. Above-the-fold optimizer

The widget provides localhost and offline support via a Service Worker on domain style.tools. You can use many of the features locally without an internet connection. The cache for preferences is preserved across domains.

Documentation is available on docs.style.tools.