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About Unused CSS
What is Unused CSS?
Unused CSS is a tool that automatically discovers and removes CSS rules your website doesn't actually use. On average, about 35% of CSS code is unnecessary, leading to bloated pages and slower load times. By cleaning up that wasted code, Unused CSS helps your site load faster, improve engagement, and reduce maintenance headaches. It works by scanning your HTML and JavaScript files to identify which CSS rules are actually being used, then provides clean, optimized CSS files you can download.
Who is it for?
This tool is built for website owners, developers, and digital agencies who manage sites built with any technology — including WordPress, Bootstrap, or custom frameworks. It's ideal if you want a faster website without manual hunting through stylesheets. However, it's not designed for static one-page projects or sites that never change. If you need continuous optimization for a dynamic or frequently updated site, Unused CSS can schedule regular scans to keep your CSS lean over time.
Real use cases
E-commerce stores use Unused CSS to cut page load time and boost sales. Agencies manage dozens of client sites, scanning daily to maintain peak performance. Developers integrate the tool via API to automate CSS cleanup in build pipelines. Even complex platforms with frequent updates benefit from the visual diff feature, which shows exactly what changed in each clean CSS file.
Key features
- Automatic unused CSS detection — Scans HTML and JavaScript to find exactly which rules are unused
- Schedule recurring scans — Daily, weekly, or ad-hoc checks to keep your CSS clean as your site evolves
- Login form scanning — Crawl pages behind authentication to capture all CSS rules
- Full preview of changes — Visual diff shows what will be removed before you download
- API access — Automate Unused CSS in your deployment pipeline or workflow
- Responsive design support — Analyzes media queries so breakpoints stay intact
- Custom user agent — Set a specific bot agent for crawling to match your site's requirements
SaaSpartout Score
7.2
/10
Editorial score from our review methodology — not user ratings.
Unused CSS Pricing
Unused CSS pricing: from $29/mo.
Individual
$29 per month ($290 annually — 17% off). 1 site, 15 scans/month, no scheduled scans, no login scanning, API access, full preview, up to 1000 pages/site, 2 landing pages, download clean CSS.
Business
$45 per month ($420 annually — 22% off). 5 sites, 100 scans/month, weekly scheduled scans, login scanning, API access, full preview, up to 5000 pages/site, 8 landing pages, download clean CSS.
Agency
$99 per month ($900 annually — 24% off). 40 sites, unlimited scans/month, daily scheduled scans, login scanning, API access, full preview, up to 10000 pages/site, 40 landing pages, download clean CSS.
Free
Free plan: 1 site, single use, no scheduled scans, no API, limited preview, up to 100 pages, 2 landing pages, no download. Sign up at UnusedCSS.com. All plans backed by a 30-day money-back guarantee.
Frequently asked questions
How much does Unused CSS cost?
Plans start at $29/month for the Individual tier (1 site, 15 scans/month). Business is $45/month, Agency is $99/month, and there is a free plan for evaluating your site with limited features.
Is there a free plan or free trial?
Yes, Unused CSS offers a free plan that covers 1 site with a single use scan (up to 100 pages, 2 landing pages, limited preview, no download). There is no time-limited trial, but all paid plans come with a 30-day money-back guarantee.
How does Unused CSS find unused CSS?
It scans your website's HTML and JavaScript files to see which CSS rules are actually applied. It then identifies rules that are never referenced and removes them, producing a clean CSS file.
Who is Unused CSS best for?
It's best for website owners, developers, and agencies who want to automatically remove bloat from their stylesheets. It works with any platform (WordPress, Bootstrap, etc.) and is especially useful for e-commerce sites or frequently updated web applications.
What are the top alternatives to Unused CSS?
Popular alternatives include PurifyCSS (for build pipelines), PurgeCSS (for static sites), and online tools like CSS Minifier. Unused CSS stands out for its ability to scan behind login forms, schedule recurring scans, and provide API access for automation.
Can Unused CSS handle JavaScript-generated CSS classes?
Yes, it scans JavaScript files for CSS rules dynamically added by scripts. However, for best results, ensure your JS files are accessible during the crawl. The tool also supports custom user agents to match your site's specific requirements.
