Why we built this
Page speed isn't just a developer preference — it's a direct factor in search rankings, conversion rates, and whether visitors stay long enough to read your content. But the mainstream performance testing tools are either overwhelming (a wall of waterfall charts and metrics you'd need a course to interpret) or oversimplified ("your site is slow, upgrade to premium to find out why").
We built Site Speed Check to sit in the middle: real performance measurements against the metrics that actually matter — Core Web Vitals, time to first byte, largest contentful paint, total page weight — with plain-English explanations for each one and concrete, prioritised recommendations for what to fix first. No signup, no credit card, no crawl limits. Just run it and read the report.
Who's behind it
Site Speed Check is part of ModusOp, a platform for operations, bookings, and client management built for small businesses and agencies. We build free developer tools like this one because we use them ourselves when diagnosing slow client sites, and because the web is better when more people have easy access to this kind of measurement.
The tool is built and maintained by JWWD, an Australian web development studio that handles the technical side of ModusOp. We've been shipping production web software since the early 2000s and we've obsessed over performance the entire time — fast sites are a better experience, full stop. To learn more about the wider platform, visit the main ModusOp site.
Our other free tools
Site Speed Check is one of several free tools we run. If this one was useful, you might like the others — all of them free, no signup, and designed to give clear, actionable answers fast:
- Meta Tag Checker — grade any page's SEO meta tags, Open Graph, Twitter Cards, headings, and image alt text.
- SSL Checker — check certificate validity, expiry, and the full trust chain for any domain.
- DMARC Dashboard — inspect a domain's SPF, DKIM, and DMARC email authentication records.
- Broken Link Finder — crawl any site and report broken internal and external links.
Get in touch
Got a question, a bug report, or a feature request? Head to our contact page and send us a message — we read every one. To learn more about ModusOp itself, visit modusop.app.