SEO tools
Page Speed & Core Web Vitals tools
Page speed and Core Web Vitals tools measure how quickly a page becomes usable — and, in the versions that matter for ranking, how quickly it became usable for the people who actually visited it.
What Core Web Vitals tools do
Everything in this category splits on one distinction, and most confusion about it comes from missing that split. Lab data is a single simulated visit on known hardware: repeatable, diagnostic, and available before a page is public. Field data is what real users experienced, aggregated over weeks: noisy, undiagnostic, and the thing Google actually uses. A lab score of 100 alongside failing field metrics is not a contradiction — it means your users are slower than your test machine, which is normal. So the tools divide by which they give you, and a serious workflow uses both: field data to decide whether there is a problem, lab data to find out what it is. Two further points get missed. Vitals are assessed per URL group rather than per site, so a bad template matters more than a bad average. And these are page-experience signals, not a ranking lever — fixing them rarely moves a page on its own, though failing them badly can hold one back.
The sub-types inside this category
- Lab auditing tools Simulate one visit and diagnose it. Repeatable and scriptable, and the only kind that can test a page before it ships.
- Field data sources Report what real visitors experienced, from the Chrome UX Report or your own instrumentation. The measurement that counts, with no explanation attached.
- Crawl-integrated performance Performance findings inside a site crawl, which is how you discover that one template is the problem across ten thousand URLs.
- Continuous monitoring and CI gates Run on a schedule or on every commit, and can fail a build. The only sub-type that prevents a regression rather than reporting one.
The Core Web Vitals tools in this directory
Matches product names, former names, categories, use cases and the company behind the tool.
Filter 4 of 4
Entry price is the lowest published figure on a plan you could buy on its own — add-ons and extra seats are excluded, and a tool whose vendor publishes no figure sits under “price not published” rather than being guessed at.
| Tool | What it is for | From | Evidence | Checked |
|---|---|---|---|---|
| Google Lighthouse Page Speed & Core Web Vitals | Audit performance, accessibility, SEO and best practices on any page | Free and open source | Free | 20 August 2026 |
| Google PageSpeed Insights Page Speed & Core Web Vitals | Check whether a page passes Core Web Vitals using real-user data rather than a lab score | Free | Free | 19 August 2026 |
| Alli AI SEO Automation | Deploy technical SEO changes to a live site without developer time | From $249/month (Business), or $2,990 billed annually | 20 August 2026 | |
| Sitebulb Website Crawlers | Produce a technical audit a client can read and act on without a specialist translating it | From $18/month (Lite); Pro $42/month | Free trial | 9 August 2026 |
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