Free website speed test tools answer one of two questions. A lab test simulates one load on one device and shows what to fix, while real-user data shows what visitors experienced. Free tiers usually give you only one of the two, with caps on locations, test credits, traffic or how long data is kept, so pick by the question you're asking.
A speed score is the answer to a question, and free tools only answer one of two. Ask the wrong one and you'll spend a week fixing a number your visitors never felt, or ignore a slow page because a single test on a fast connection looked fine.
Lab test or real visitors: which question are you asking?
A lab test loads your page once, on one simulated device and connection, and tells you what slowed it down. It's the tool for finding fixes, but its score can disagree with what real visitors see. Real-user data comes from the people who visit your site. It shows what they experienced, but free tiers cap it or keep it only briefly.
There's another wrinkle for small sites. Google's own PageSpeed Insights documentation says that when a page has too few real-user samples it falls back to data for the whole site, and if the whole site has too few, it can't show any real-user data at all. So a small site may only ever see lab numbers there, which is one reason the real-user tools below exist.
Seven free speed tools compared
| Tool | Kind of test | Good for |
|---|---|---|
| DebugBear | Page speed test and monitoring | One-off tests showing slow third-party code |
| Lighthouse | Open source page auditor | Auditing one page for speed, accessibility and SEO |
| Request Metrics | Real-user monitoring | Core Web Vitals from real visitors on a personal site |
| Sitespeed.io | Self-hosted performance testing | Checking pages and user journeys on your own machine |
| SpeedVitals | Speed test and monitoring | Weekly speed and TTFB tests from many locations |
| Treo | Real-user Core Web Vitals report | Real Chrome user data for any domain, no sign-up |
| Unlighthouse | Site-wide audit scanner | Running audits across every page of a site |
Before you trust a free speed tool, check these
- Test locations. A test from one region tells you little about visitors on another continent.
- Credits per week. Some free plans give a set number of tests a week; count how many you'll run after each change.
- Data kept. Real-user data kept for a day can't show you a trend.
- Traffic cap. Free real-user monitoring often stops at a monthly number of visits or page views.
- Self-hosting effort. Open source tools are free to run but need someone comfortable with the command line or Docker.
What each free speed tier measures, as of Nov 2026
Real-user data
Treo's free report is real-user data only, drawn from Chrome users, not a simulated test; its page says it needs no sign-up, tracking script or DNS check, and the free dashboard tracks up to 5 domains. Request Metrics' free plan covers 1 user and 1 website, keeps data for 24 hours, caps monthly traffic at 1,000 visits, and keeps lab tests on its higher tiers.
Hosted lab tests with a cap
DebugBear's free test runs from US East only, on mobile or desktop; its 30+ other test locations need a sign-up, and ongoing monitoring and test history sit under a trial rather than the free test. SpeedVitals' free plan gives 15 speed test credits and 15 TTFB credits a week, one monitoring slot checked every 24 hours and kept for 1 month, and real-user monitoring for 1 website up to 5K page views a month.
Free because you run it
Lighthouse is open source, per its page, and runs in Chrome DevTools, from the command line or as a Node module; each run tests one page and gives a simulated lab result. Unlighthouse, labelled a v1 beta on its page, runs those audits across a whole site from Node, though pages linked only through JavaScript may be missed. Sitespeed.io is open source too; you host it yourself, and dashboards over time need extra tools such as Graphite or InfluxDB with Grafana.
The seven speed tools, in no particular order
DebugBear
Best for: Site owners wanting a quick free test of their own or a competitor's page, with a step by step load view and fix suggestions.
Lighthouse
Best for: Developers and site owners checking a single page for performance, accessibility and SEO issues from Chrome DevTools, the command line or Node.
Request Metrics
Best for: Solo projects and personal websites that want real-visitor Core Web Vitals monitoring with email alerts, on modest traffic.
Sitespeed.io
Best for: Technical teams testing pages or full user journeys and wanting HTML reports with Core Web Vitals, a load video and a waterfall.
SpeedVitals
Best for: Anyone checking load speed and server response time from several locations each week, with one site monitored daily.
Treo
Best for: Marketers comparing how real Chrome users experience their domain and competitors' domains, with history and country filters and no tracking script.
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Unlighthouse
Best for: Developers who want every page of a site audited in one dashboard from the command line, rather than testing pages one by one.
My advice on testing site speed for free
Use both kinds of tool, because they answer different questions. Run a lab test after every change to see what to fix, and check real-user data every few weeks to see whether visitors noticed. If your site is small and the free real-user reports are thin, lean on repeated lab tests from a location close to your customers, and don't chase a perfect score at the expense of a page that sells.
If you need daily monitoring across many pages, a self-hosted tool or a monitoring service will serve you better than juggling free credits. Our wider guide to website speed test tools covers those, and since a fast site still needs to be up, our list of free uptime monitoring tools is worth a look too.
Do you make a website speed test tool with a free plan? Tool makers can ask to be considered for a featured place on this list.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
Why do different speed test tools give different scores?
Each tool tests from a different location, device and connection, and lab tests measure one simulated load. Real-user tools average what visitors saw. Compare trends within one tool rather than scores across tools.
What are Core Web Vitals?
They're three measures Google uses for page experience: how quickly the main content appears, how quickly the page responds when someone interacts, and how much the layout shifts while loading.
How often should I test my website speed?
Run a lab test after any change to themes, plugins, images or scripts, and check real-user data every few weeks. Daily monitoring helps busy sites catch problems before customers do.
Why can't I see real-user data for my site?
Real-user reports need enough visits to be reliable. A small or new site may not have enough samples, so you'll only see lab results until traffic grows, or you can add a real-user monitoring script.
Does website speed affect sales?
Slow pages frustrate visitors, especially on phones, and frustrated visitors leave. Speed is one part of the experience, alongside clear content and an easy checkout, so fix the slowest pages your customers use most.
Do I need a developer to run free speed tests?
Not for hosted tests or the audit built into Chrome. Self-hosted and command line tools need someone comfortable with Node or Docker.
