The 15 Best Website Audit Tools, Across All Seven Audit Layers

Search for website audit tools and you get the same handful of SEO crawlers recommended over and over. They earn their place, but a crawler is not a website audit. It will tell you about titles, redirects, and broken links, and it will stay completely silent about the fact that your checkout fails on a keyboard, that your contact form leaks data to eleven trackers before anyone consents, that your certificate expires in nine days, or that a forgotten plugin carries an unpatched vulnerability. Those are website problems, and a real audit finds all of them.

A complete audit spans seven layers: how search engines crawl and index the site, how fast it loads for real users, whether people with disabilities can use it, whether it is secure, whether the content is any good, whether tracking is set up correctly, and whether it meets the privacy and accessibility laws that apply to your visitors. No single tool does all seven well; anything claiming to does three properly and invents a vanity score for the rest. So the fifteen tools below are chosen to cover every layer between them, with the best free option leading wherever one exists. Each entry explains what the tool does, who it suits, where it is strong, where it falls short, when it launched, and what it costs. For the search-specific slice, our technical SEO tools guide goes deeper.

Two recent shifts change how you should audit, and one has legal teeth. The European Accessibility Act (Directive (EU) 2019/882) became enforceable on 28 June 2025 for new products and services across all 27 EU member states. It covers e-commerce, banking, telecoms, transport ticketing, and audiovisual media, and it reaches non-EU businesses too: if you sell to EU consumers, you are covered wherever your company sits. The operative technical standard is EN 301 549 (v3.2.1), which incorporates WCAG 2.1 Level AA. The only broad carve-out is for microenterprises — fewer than 10 employees and under €2 million turnover — and it applies to services only, not products, and does not exempt non-EU firms serving the EU. Second shift: automated accessibility scanners catch only about 30–40% of real barriers. They find missing alt text, poor contrast, and unlabeled fields in seconds, but they cannot tell you whether a keyboard user can finish your checkout. A green score means the machine found nothing it knows how to look for, not that your site is fine. This is general information, not legal advice; confirm your obligations with a qualified specialist.

1. Google Search Console (start here, free)

This is the correct first stop for any audit because it is the only data that comes from the search engine itself rather than a third-party estimate. It reports index coverage, crawl errors and stats, Core Web Vitals measured from your real visitors, and security or manual-action alerts, all for domains you verify. No paid tool replicates that first-party view. Its limitations are scope and interface: it only covers sites you own, its reports are sampled rather than exhaustive, and it tells you what is wrong more clearly than why. Read it before spending anything, then layer specialist tools on top for the parts it does not reach. Our technical SEO tools guide covers the crawl-and-index layer in more depth.

Best for: free, authoritative crawl, index, and Core Web Vitals data  ·  Layer: crawlability & indexing  ·  Launched: 2015  ·  Pricing: Free

2. Google PageSpeed Insights (best free speed and Core Web Vitals check)

PageSpeed Insights is the fastest way to audit performance because it combines both kinds of speed data in one report: lab results from a controlled Lighthouse test (repeatable, good for debugging) and field data from real Chrome users (what search engines actually use to judge you). Confusing those two causes most speed frustration, and seeing them side by side ends it. It also runs Lighthouse's accessibility, SEO, and best-practice checks, so a single run touches four layers. The catch is that it audits one URL at a time and offers no history, so pair it with a monitoring tool for trends. Oversized images and third-party scripts cause most slow pages, and compressing assets first solves a surprising share without touching code — our free image compressor handles that step.

Best for: lab-plus-field speed diagnosis with prioritized fixes  ·  Layer: speed & Core Web Vitals  ·  Launched: 2010  ·  Pricing: Free

3. Screaming Frog SEO Spider (best crawler for raw technical data)

Screaming Frog is the workhorse of technical auditing. It walks your site the way a search engine does, follows every link, and hands you raw data you can slice yourself, which is exactly what you want during a migration or a debugging session where an interpreted summary hides the detail you need. It renders JavaScript, extracts custom data, and connects to analytics and Search Console for enriched crawls. The free tier covers the first 500 URLs, enough to audit most small sites completely. The trade-offs are a steeper learning curve than the guided platforms and the fact that, as a desktop crawler, very large sites are limited by your own machine. If you know what you are looking for, nothing is faster.

Best for: raw crawl data for migrations and technical debugging  ·  Layer: crawlability & indexing  ·  Launched: 2010  ·  Pricing: Free / from £199/yr

4. Sitebulb (best crawler for plain-English reporting)

Sitebulb solves the same crawling problem as Screaming Frog but in the opposite spirit: it is slower, and in exchange it explains every issue in plain language, ranks problems by priority, and produces visual crawl maps and reports a client can actually read. That makes it the friendliest paid crawler for people who want the tool to teach them rather than dump a spreadsheet, and the most presentable for agency deliverables. Its depth of hints is genuinely educational. The trade-off is speed and, for very large sites, patience. Plenty of agencies run both tools — Screaming Frog to investigate, Sitebulb to explain and report — which is a sign of how well each fits its niche.

Best for: prioritized, explained audits and client-ready reports  ·  Layer: crawlability & indexing  ·  Launched: 2017  ·  Pricing: From $45/mo

5. Semrush Site Audit (best all-in-one platform)

When you want crawlability, on-page issues, speed signals, and basic health scoring in one pass, and ideally connected to keyword and competitor data you already use, Semrush Site Audit is the strongest all-in-one. It runs well over a hundred checks, groups them into thematic reports, compares crawls over time, and renders JavaScript, so it covers the everyday audit for most businesses without stitching tools together. The honest limitation is depth: a general platform tells you a page loads slowly but not why at the network level, and it flags obvious accessibility failures while missing most of them. Judge it on how well it prioritizes rather than how many issues it lists. Ahrefs Site Audit is a close alternative if you prefer that ecosystem. For the on-page slice specifically, see our on-page SEO tools guide.

Best for: one platform covering the core SEO and technical layers  ·  Layer: crawlability, on-page & speed signals  ·  Launched: 2013  ·  Pricing: From $139.95/mo

6. axe DevTools (best accessibility scanner)

Now that accessibility carries legal penalties in the EU, this layer matters more than ever, and axe is the industry-standard rules engine that most other accessibility tools are built on. It finds the mechanical failures fast — missing alt text, contrast problems, unlabeled fields, broken landmark structure — and its guided testing walks you through checks a pure scanner cannot automate. The essential caveat bears repeating: automated tools catch only about 30–40% of real barriers, so after the scan you must test manually with a keyboard and a screen reader, and the free WAVE tool by WebAIM is an excellent visual companion for that work. One firm line: overlay widgets promising instant compliance are not accepted by regulators as compliance, and their presence often signals the opposite.

Best for: fast, standards-based accessibility scanning as step one  ·  Layer: accessibility  ·  Launched: 2015  ·  Pricing: Free / from $40/mo

7. Qualys SSL Labs (best free TLS and certificate check)

This is the five-minute check nobody runs until something breaks spectacularly. An expired certificate takes a site offline instantly; a missing intermediate certificate works in your browser and fails on older devices. The SSL Labs Server Test grades your full certificate chain, protocols, and ciphers from A to F and explains exactly what to fix, and it is completely free. Pair it with Mozilla Observatory and a security-headers scanner for the configuration side, both also free. Its only real limitation is scope: it audits transport security specifically, not application vulnerabilities, so it belongs alongside a broader scanner rather than replacing one. Add automated certificate-expiry alerts once and you never think about it again. When building test URLs with tracking parameters, our free URL encoder avoids the malformed links that break reporting.

Best for: definitive certificate and TLS configuration grading  ·  Layer: security  ·  Launched: 2009  ·  Pricing: Free

8. Sucuri SiteCheck (best free malware and blacklist scan)

Security is the layer most marketers skip and most breaches exploit, and the usual cause is mundane: an outdated plugin, a forgotten subdomain, an admin panel indexed by accident. Sucuri SiteCheck scans your site for malware, blacklisting, and defacement from the outside for free, giving a fast read on whether you have an active problem. For a deeper audit, the professional penetration-testing world runs largely on free, open-source software — OWASP ZAP for dynamic scanning, Nikto and WPScan for server and WordPress-specific checks — which makes this one of the best-value categories anywhere. Two firm boundaries: SiteCheck's external scan cannot see everything an authenticated scan would, and you must only scan sites you own or have written permission to test, because aggressive scanning of others' servers is illegal in most countries. While hardening accounts, a strong password generator is a sensible companion.

Best for: a fast, free malware and reputation check  ·  Layer: security  ·  Launched: 2010  ·  Pricing: Free / from $199/yr

9. Microsoft Clarity (best behavior and UX audit tool)

Every tool above audits what your site is; Clarity audits what people do with it, and it is genuinely free with no page limits. Heatmaps show where attention lands, scroll maps show where readers give up, and session recordings show a real person hunting for a button that sits below the fold, with automatic rage-click and dead-click detection surfacing friction you would never catch in a spreadsheet. This is where technical audits and business results finally connect: a page can pass every automated check and still fail because a form asks for something nobody wants to give. The limitation is that it describes behavior rather than diagnosing causes, so use it to find the problem and other tools to explain it. Watching ten recordings of your most important page teaches more than any score.

Best for: free heatmaps and session recordings to find UX friction  ·  Layer: user behavior  ·  Launched: 2020  ·  Pricing: Free

10. Cookiebot (best privacy and consent audit tool)

If you serve visitors in Europe, the UK, California, or a growing list of regions, you need to know which trackers your site loads, when they fire, and whether consent came first. The common failure is technical rather than intentional: a consent banner sits on the page while analytics and advertising scripts load immediately behind it, which looks compliant and is not. Cookiebot scans your site for cookies and trackers, manages consent, logs it, and produces monthly reports, closing that gap. For a quick free audit of what actually fires before consent, the Blacklight scanner is excellent and takes seconds. The trade-off is that full consent management is a paid, ongoing product rather than a one-off check, and rules differ by region, so confirm your specific obligations. Most people are surprised by how many third parties they load.

Best for: auditing trackers and managing consent by region  ·  Layer: privacy & compliance  ·  Launched: 2012  ·  Pricing: Free / from $9/mo

11. Siteliner (best free content and duplication audit)

A content audit answers three questions: what do we have, what is working, and what should be deleted, and that last one is the hardest and most valuable. Thin, outdated, and duplicated pages dilute a site, and consolidating them often lifts the pages that remain. Siteliner scans your own site for free, surfacing internal duplicate content, broken links, and a page-power view that shows which pages carry weight. For external duplication — someone copying your work, or supplier descriptions repeated across hundreds of stores — pair it with Copyscape, and for inventory blended with traffic, a suite's content-audit module. Its limits are the free scan's page cap and its focus on duplication over deeper quality judgment. While reviewing drafts, our free word counter and duplicate line remover speed up the manual parts.

Best for: free internal duplicate-content and page-power analysis  ·  Layer: content quality  ·  Launched: 2013  ·  Pricing: Free

12. Google Tag Assistant (best free tracking and tag audit)

Do this before any other audit, because if your measurement is broken then every conclusion you draw afterward is built on fiction, and a great many sites are making decisions on broken data without knowing it: a tag fires twice and inflates conversions, or a form event quietly stopped working during a redesign months ago while the dashboard kept showing numbers. Tag Assistant validates that your tags install and fire correctly across a user journey, and Tag Manager's preview mode lets you inspect every trigger and variable live, both free. The limitation is that it verifies firing rather than analysing the resulting data, so it is a diagnostic step, not an analytics platform. Once the numbers are trustworthy, our guide to AI data analysis tools covers what to do with them.

Best for: verifying tags fire once, correctly, before you analyse anything  ·  Layer: tracking & data  ·  Launched: 2012  ·  Pricing: Free

13. UptimeRobot (best uptime and availability monitoring)

An audit is a snapshot; monitoring is the film, and everything you fixed today can break tomorrow through a plugin update, an expired card on a hosting account, or an untested deployment. UptimeRobot checks your site every few minutes and messages you within seconds of an outage, with a capable free tier, multi-channel alerts, public status pages, and certificate-expiry monitoring in one place. It is the cheapest insurance in this whole category. Two practical tips maximise it: set the check interval as tight as your plan allows, and monitor a page that exercises your database rather than a static homepage, because a homepage can load perfectly while the application behind it is down. It watches availability rather than diagnosing root cause, so pair it with the tools above when something trips.

Best for: outage alerts and certificate-expiry monitoring  ·  Layer: ongoing monitoring  ·  Launched: 2010  ·  Pricing: Free / from $7/mo

14. Query Monitor (best audit tool for WordPress sites)

Around forty percent of the web runs on WordPress, which means a large share of website problems are really plugin problems, and a generic crawler sees the symptom (a slow page, a broken link) but not the cause. Query Monitor is the free developer gem that sees the cause: which plugin is running the slow database query, which theme function is throwing the PHP error, which HTTP request is blocking the page. Paired with the built-in, free, and consistently ignored WordPress Site Health checks, plus a security plugin such as Wordfence or Patchstack for vulnerability intelligence, it turns a vague "the site feels slow" into a named culprit. Its limitation is obvious: it only helps on WordPress. If that is your platform, it belongs in the stack. Store owners should also see our ecommerce tools guide.

Best for: pinpointing the plugin or query behind a WordPress problem  ·  Layer: CMS-specific diagnosis  ·  Launched: 2013  ·  Pricing: Free

15. AgencyAnalytics (best for audit reporting at scale)

At a certain scale the audit itself stops being the hard part, and proving it happened, tracking whether anything got fixed, and packaging the result for a client or executive becomes the real work. AgencyAnalytics pulls site-audit findings alongside rankings, traffic, and other channels into automated, branded reports delivered on a schedule, removing hours of manual assembly every month and giving clients the deliverable they actually judge you on. It is a reporting layer rather than an audit engine, so it sits on top of the tools above rather than replacing them, and a single-site owner does not need it. For an agency proving monthly value, though, the reporting layer alone often justifies the cost. Teams scripting their own checks should also look at our SEO automation tools guide.

Best for: automated, white-label client reporting across sites  ·  Layer: reporting & scale  ·  Launched: 2010  ·  Pricing: From $79/mo

Quick comparison

Pricing reflects publicly listed entry plans at the time of writing, and enterprise tiers quote on request. Treat every figure as a shopping guide, not a quote, and confirm the current plan before you buy.

How to choose from these fifteen

Do not buy a big platform and audit everything at once; a nine-hundred-issue report gets abandoned. Pick the layers you actually care about and cover them, mostly for free. For a site under 500 pages you can run a genuinely complete audit at no cost: Search Console and PageSpeed Insights for indexing and speed, the free Screaming Frog tier for the crawl, axe and WAVE for accessibility, SSL Labs and Sucuri for security, Microsoft Clarity for behavior, Tag Assistant for tracking, a Blacklight scan for privacy, and UptimeRobot for monitoring. That stack costs nothing and covers all seven layers. Add paid tools only when you audit often enough that doing it by hand costs more than the subscription: Sitebulb or Semrush Site Audit for scheduled full-site crawls, Cookiebot for ongoing consent management, and AgencyAnalytics if you report to clients. Cross-browser and mobile rendering matter too, and a cloud device lab is worth adding when a layout bug on hardware you do not own is costing conversions. Above all, ignore the health score — two tools will grade the same site forty points apart — and read the issue list underneath instead. To confirm rankings recover after a migration, pair your audit with our keyword rank checker tools guide.

Frequently asked questions

What are website audit tools?

Website audit tools are software that analyse an existing site and report what is broken, slow, insecure, inaccessible, or badly optimized. A complete audit spans seven layers: crawlability and indexing, page speed, accessibility, security, content quality, tracking accuracy, and privacy compliance. Most tools specialise in one or two of those layers, which is why practitioners run a small stack rather than a single product. The category is broader than most articles suggest, because search results for the term are dominated by SEO crawlers that cover only part of the picture.

What is the best free website audit tool?

Google Search Console, with PageSpeed Insights close behind. Search Console shows what the search engine actually recorded about your site — index coverage, crawl errors, Core Web Vitals from real users, and security alerts — and no paid tool replicates that first-party data. PageSpeed Insights runs Lighthouse across performance, accessibility, SEO, and best practices in one pass. Add the free Screaming Frog tier for a 500-URL crawl, axe and WAVE for accessibility, Microsoft Clarity for behavior, and UptimeRobot for monitoring, and you have covered most of a real audit for nothing.

What is the difference between an SEO audit and a website audit?

An SEO audit examines whether search engines can crawl, index, and rank your pages. A website audit includes that but adds performance, accessibility, security, content quality, tracking accuracy, and legal compliance. The distinction matters because a site can pass an SEO audit completely while failing accessibility law, leaking data to trackers before consent, or running an unpatched vulnerability. Most articles ranking for "website audit tools" actually list SEO tools only, which is exactly the gap this guide is built to close.

Do automated accessibility checkers make my site compliant?

No. Automated scanners detect only about 30–40% of accessibility barriers. They reliably catch missing alt text, contrast failures, and unlabeled form fields, which is valuable and takes seconds, but they cannot judge whether alt text is meaningful, whether a keyboard user can complete a task, whether focus order makes sense, or whether errors are understandable through a screen reader. Compliance requires manual testing with assistive technology on real user journeys. Overlay widgets that claim instant conformance are not accepted by regulators as compliance.

Does the European Accessibility Act apply to my business?

It became enforceable on 28 June 2025 for new products and services across all 27 EU member states, and it covers e-commerce, banking, transport ticketing, telecoms, and audiovisual media. It reaches businesses outside the EU that serve European consumers, so a US or UK store accepting EU orders is covered. The operative standard is EN 301 549 (v3.2.1), which incorporates WCAG 2.1 Level AA. The only broad exemption is for microenterprises — fewer than 10 employees and under €2 million turnover — and it applies to services only and does not help non-EU firms serving the EU. Existing services already on the market generally have until 28 June 2030. This is general information rather than legal advice, so confirm your position with a qualified specialist.

How often should I audit my website?

Run a full audit quarterly and a light check monthly, plus an unscheduled audit after any redesign, migration, significant traffic drop, template-touching plugin update, or change in the privacy rules that apply to your visitors. Continuous monitoring makes most of this unnecessary, since a tool that alerts you the day something breaks is more useful than a report you read twice a year. Small sites publishing rarely can stretch to twice yearly without much risk.

What should I audit first after a redesign or migration?

Index coverage and redirects, on launch day, in that order. Crawl the old site before you switch, export every URL, then run that exact list against the new site and check what returns. Anything not redirecting to a relevant page is a page you just deleted along with its accumulated authority. Then confirm tracking still fires, that the certificate covers all hostnames, and that your robots file did not ship with staging rules. Speed and accessibility can wait a week; those three cannot.

Can an AI assistant audit my website?

It can help interpret an audit rather than perform one. AI assistants are useful for explaining what a technical issue means, prioritising an exported issue list, writing the remediation ticket, and drafting the report, but they cannot crawl your site, measure real-user performance, test with a screen reader, or scan for vulnerabilities. Run real tools, export the findings, then use an assistant to turn a thousand rows into a ranked action plan, and verify anything technical before acting on it. For adjacent tasks, browse the full library of guides or our free online tools.

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