// free tools

Free SEO and performance tools with the evidence behind each answer

17 tools, each with one clear answer, from Core Web Vitals measured on real Chrome visitors to the robots.txt rule that lets a crawler in and the downtime an SLA allows – no signup, no API key.

// which tool?

// start here

Inspector: free page audit

Most of the checks below, run against one page at once, plus a real browser load and a full Lighthouse pass. Scored out of 100, with a link that lasts 30 days.

Audit a page

Crawling & indexing

Whether Google can reach a page, whether it can index it, and how it looks in the results once it does.

robots.txt testerSee which of 29 crawlers can fetch a page, and which rule decided it.Redirect checkerFollow every hop and catch loops, http detours and 302s that should be 301s.Indexability checkerFind out whether Google can index a page, and what is stopping it.Schema validatorCheck structured data against what rich results actually require.Sitemap validatorCheck your sitemap for errors, size limits and dates Google will trust.Hreflang checkerCheck that your language versions point at each other correctly.Googlebot IP checkerFind out whether an IP address is really Googlebot, or a fake using its name.

Performance & Core Web Vitals

How fast your pages are for real Chrome visitors over the last ten months, and how you compare with the competitors you pick.

CrUX historyChart 40 weekly readings of real Chrome visitor data for any site or page.Core Web Vitals comparisonCompare your site with up to three competitors on real Chrome data, not Lighthouse.

AI & agents

Which AI crawlers you let in, and whether AI agents find what they need to use your site.

AI crawler blockerPick which AI crawlers to block and copy out the robots.txt rules.AI agent readiness checkerScore your site against the emerging standards AI agents look for.

Rendering & JavaScript

What a real browser sees: the SEO tags your JavaScript adds, and the cookies set before anyone clicks accept.

Raw vs rendered HTMLSee which SEO signals only exist after your JavaScript runs.Cookie & tracker scannerSee the cookies, storage keys and trackers a page fires before any consent.

Security & headers

What your live headers say about security, HTTPS and caching, and where a policy that looks strict has a hole in it.

HTTP headers checkerGrade your security, transport, caching and compression headers in one pass.CSP checkerFind the gaps in a Content Security Policy that looks strict but is not.HSTS & preload checkerCheck that HTTPS is enforced, and whether preloading is safe for you.

Uptime & SLAs

How much downtime an uptime target allows, and what an outage does to your SLA.

Uptime calculatorTurn an uptime target into allowed downtime, or an outage into uptime.

// once vs. always

A one-off check, or being told when it changes

Most tools here are a one-off version of a VitalSentinel module, which keeps running the check and alerts you the moment the answer changes.

Free tool

Answers once, for the URL you paste

Module

Keeps checking, alerts you when it changes

CrUX Monitoring

Indexing Monitoring

Robots.txt Monitoring

Sitemap validator

Sitemap Monitoring

Page Monitoring

Googlebot IP checker

Server Log Monitoring

Uptime calculator

Uptime Monitoring

Ask Theo, the AI assistant in the app, and it explains any finding in plain words.

// free for chrome

The same checks on every page you visit

The free VitalSentinel SEO Extension for Chrome runs them in one click on the page you have open: indexability, raw HTML vs rendered, crawler access for 6 search crawlers and 12 AI bots, structured data, HTTP headers, Core Web Vitals on your device and an AI readiness score.

Free
No account needed
One click

Add to Chrome See the extension

techseovitals.com

The Overview report of the VitalSentinel SEO Extension: status chips, LCP, INP and CLS on this device, Needs attention and Changed since your last visit

// free to start

Stop running these checks by hand

Core Web Vitals from real users, indexing and robots.txt, uptime and SSL, monitored continuously. Start on the Free plan and add your first domain in under a minute.

Start for free See pricing

1 domain freeNo credit cardAll 12 modules5.0on G2