About
SpeedSonar is a set of free diagnostic tools for people who run websites: speed, TTFB, DNS, SSL, uptime, and latency checks. No signup, no installed software, no data retained about the sites you test.
Every result on this site is a measurement, not an opinion. Where a result page points to products (hosting, CDNs, SSL vendors), performance claims cite an external, linkable benchmark — never this site's own authority — and category pointers are listed without ranking. Some of those links are affiliate links, which fund the tools; the full policy is in the disclosure.
Server-side checks (TTFB, uptime, latency, DNS, SSL) run from a single server, and results are labeled with that vantage point. Speed tests use the Google PageSpeed Insights engine.
The tools
- Website speed test — Core Web Vitals, TTFB, page weight — with plain-language fixes.
- TTFB checker — Measure how fast your server responds, before any page code runs.
- DNS propagation check — Query multiple public resolvers and see if they agree.
- SSL certificate checker — Certificate validity, expiry countdown, and security headers.
- Is my website down? — One-shot uptime check from an external server: status and response time.
- Latency test — Measure round-trip latency to your server.