# The best SEO audit tools, and which one a founder needs

You want the best SEO audit tool. You need the right mix, not one logo. This guide shows what each kind of tool does, when to use it, and how to run a tight audit without wasting a week.

Updated 2026-09-14 · Source: https://porteur.ai/guides/best-seo-audit-tools

## What an audit tool does, and what an audit is

An audit tool crawls pages and applies rules. It outputs issues. It does not decide what matters for your business.

An SEO audit is your judgement. You read Search Console, speed and crawl data, then you pick the few changes that move revenue. Tools assist. They do not prioritise the roadmap for you.

> Rule: fix crawlability, indexation and broken UX first. Then titles, internal links and content intent. Then nice-to-haves.

## Pick by job, not by logo

There are four jobs. Crawl the site. Check speed and UX. Read your real search data. Compare the market for keywords and links. Map tools to these, not to a brand.

| Job | Built for | Good tools | Use when |
| --- | --- | --- | --- |
| Crawl and on‑page checks | Find broken links, tags, canonicals, internal links | Screaming Frog, Sitebulb | You can run a desktop crawl and want raw data or guided hints |
| Speed and UX | LCP, CLS, INP, waterfalls, lab and field | PageSpeed Insights, Lighthouse, GTmetrix, WebPageTest, Chrome DevTools | A page feels slow or Core Web Vitals dip |
| Pre‑click truth | Your queries, clicks, positions | Google Search Console, Bing Webmaster Tools | You want to know what Google actually shows and clicks |
| Market and links | Keywords, rivals, backlinks | Ahrefs, Semrush, Moz, Majestic, SE Ranking, Ubersuggest, SpyFu, Mangools | You plan content, compare domains, or audit links |

A single all‑in‑one rarely covers everything well. Suites add audits, but a desktop crawler still finds edge cases and lets you verify fixes on your machine.

## Desktop crawlers you can trust

Screaming Frog SEO Spider is a desktop crawler for Windows, macOS and Linux. The free version crawls up to 500 URLs. The licence unlocks unlimited crawls, custom extraction, scheduling and API connections. It outputs tables you interpret yourself.

Sitebulb is a desktop crawler for Windows and macOS, with a cloud version. It is known for explained audit hints with priorities and visual crawl maps. It suits founders who want guidance over raw sheets.

- Choose Screaming Frog if you like spreadsheets and custom extraction.
- Choose Sitebulb if you want prioritised hints and diagrams.
- For big sites you cannot crawl on a laptop, a cloud crawler like Lumar or Oncrawl fits, but that is rarely needed on a young SaaS or store.

A fixed page looks like this in a crawler: /pricing has one h1, a self‑referencing canonical, 200 status, indexed, and receives internal links from / and /features. The old /pricing-v2 301s to /pricing with no chains.

## Suites with audit modules

Ahrefs is known for its backlink index and Site Explorer. It also has Keywords Explorer, Site Audit, Rank Tracker and Content Explorer. Domain Rating is a link‑based score from 0 to 100. Ahrefs Webmaster Tools is free for verified sites and gives Site Audit and Site Explorer on your own site.

Semrush is a broad suite. Keyword Magic Tool, Position Tracking, Site Audit, Backlink Analytics and competitive research come standard, with modules for advertising and content. Authority Score is its domain‑level metric. The audit module is solid, and the suite is deep if you run campaigns beyond SEO.

Moz Pro holds Keyword Explorer, Link Explorer, Site Crawl, Rank Tracking and an On‑Page Grader. Domain Authority runs 0 to 100 and is relative and logarithmic. The MozBar extension is free. Moz is also known for education, which helps if you are new to audits.

SE Ranking covers rank tracking, website audit, keyword and competitive research, backlinks and on‑page checks. It includes agency features and is often chosen as the affordable full suite. It is a fit for small teams that need a bit of everything.

Ubersuggest offers keyword ideas, content ideas, a site audit, rank tracking and backlink data. There is a free daily allowance. It is aimed at beginners and has a simpler interface than the big suites. Its data is smaller than the large suites as of 2026.

- Pick Ahrefs if links and competitive research lead your plan.
- Pick Semrush if you want a deep suite across SEO, paid and content.
- Pick Moz if you value clarity, DA and simple crawl checks.
- Pick SE Ranking if you need an all‑rounder on a lean budget.
- Pick Ubersuggest if you are new and want a gentle start.

## Free single‑page checkers and speed tests

Lighthouse is an open‑source lab tool in Chrome DevTools, the CLI and PageSpeed Insights. It scores performance and flags accessibility, SEO basics and more in a controlled test. Treat it as a lab signal, not the truth for users.

PageSpeed Insights is free. It runs Lighthouse and shows Chrome UX Report field data. You see Core Web Vitals from real users when available and a lab run for both mobile and desktop.

GTmetrix and WebPageTest add waterfalls, locations and devices. GTmetrix is built on Lighthouse. WebPageTest shows filmstrips and deep request data. Both help you catch render‑blocking, slow third‑party scripts and image weight.

> Aim for LCP under 2.5 seconds, CLS under 0.1 and INP under 200 ms on your top templates.

Chrome DevTools adds the Performance panel. Record a slow page. You will see long tasks and layout shifts in context. Fix the one script that blocks the thread, not every warning in a list.

## The truth lives in webmaster tools and analytics

Google Search Console is free. It shows search performance, indexing, sitemaps, Core Web Vitals and enhancements. It is pre‑click. It is the source for your queries, pages, impressions, clicks and positions, not a third‑party guess.

Bing Webmaster Tools is free. It includes backlinks, keyword research and IndexNow. It is worth a look even if your main traffic is from Google. You may find easy wins and missed sitemaps.

Google Analytics 4 is free and event‑based. It is post‑click. It shows sessions, pages, events and conversions. GA4 and Search Console never reconcile exactly. Use each for its job and resist chasing a match that does not exist.

## Backlink and market tools in an audit

Links are part of an audit. Use Ahrefs Site Explorer, Semrush Backlink Analytics or Moz Link Explorer to find referring domains, broken backlinks and spammy patterns. Majestic runs its own link index and adds Trust Flow and Citation Flow from 0 to 100 and Topical Trust Flow by category.

Use a keyword tool to check intent and gaps. Ahrefs Keywords Explorer, Semrush Keyword Magic Tool and Moz Keyword Explorer are strong. Mangools KWFinder and Ubersuggest suit small teams and beginners. SpyFu is handy to see a rival’s paid and organic keyword history over years.

Similarweb estimates traffic for any site and breaks sources. Treat it as an approximation, more rough for small sites. It is not a keyword or audit tool for your own site, but it helps set expectations in a market scan.

## Which tool a founder needs right now

- A new site under 200 pages: Screaming Frog or Sitebulb for a crawl, Google Search Console, PageSpeed Insights and Lighthouse. Add Bing Webmaster Tools.
- A growing SaaS with content plans: add a suite, usually Ahrefs or Semrush, for keywords, links and rank tracking. Keep your desktop crawler.
- An ecommerce store with filters: prefer a desktop crawler that handles parameters and canonicals well. Pair with Search Console and PageSpeed Insights.
- A team with agency needs: SE Ranking can cover tracking, audits and reporting in one place.
- A beginner who wants simple: start with Ubersuggest, MozBar and Search Console. Add a crawler when you are ready.

> Do not buy two big suites. If you need a second view, mix a suite with a desktop crawler and Search Console.

## Run a 90‑minute audit on a small site

1. **Pull the truth from Search Console** Open Performance. Filter last 28 days. Sort pages by clicks. Note top 10 pages and their top queries. Spot pages with high impressions and low CTR.
2. **Crawl the site** Run Screaming Frog or Sitebulb. Export 3 lists: 4xx and 5xx, non‑200 with internal inlinks, and indexability with canonicals. Check /, /pricing, /guides/getting-started, and any template URL.
3. **Fix the blockers** Repair broken internal links. Ensure one canonical per page. Remove noindex from pages meant to rank. Add a sitemap if missing, then submit in Search Console.
4. **Tighten titles and h1s** On the top 10 pages from step 1, check title length and query fit. For a query like "best crm for freelancers", make sure the title and h1 match the intent.
5. **Tune internal links** From /guides, link to the main money pages with clear anchors. Add a link to /pricing from /features. Remove orphan pages or link them in.
6. **Check speed on two key pages** Run PageSpeed Insights on / and /pricing. If LCP is over 2.5 seconds, optimise the hero image or reduce render‑blocking scripts. Re‑test after a change.
7. **Note content intent gaps** Search your top queries in an incognito window. If your /blog/tips page ranks for a transactional query, plan a landing page to match purchase intent.
8. **Write your next three actions** One technical, one on‑page, one content. For example: remove a redirect chain to /pricing, retitle /guides/getting-started, and draft /compare/yourtool-vs-alt.

## Single‑page checkers you will see in the wild

Many sites offer a free SEO checker. They scan one URL and flag titles, headings, links and speed basics. They are fine to spot obvious misses on a homepage. They are not a site audit. Use one as a smoke test, then run your own crawl and read Search Console.

## When you need a report that reads the whole picture

Sometimes you do not want to run tools, you want the next three moves. That is a report. It reads your site, your searches and your rivals, and it weighs what matters. We make Porteur, a growth report bought once with a free check first, not a rank tracker or a crawler you run yourself.

## What a fixed page looks like in practice

Take /pricing. Title under about 60 characters, clear value and brand. One h1 that matches the title. Primary content loads early, with LCP under 2.5 seconds. The canonical is self‑referencing. No duplicate variants like /pricing?ref=twitter in the index. Internal links from / and /features with anchor "Pricing". Search Console shows rising CTR after the title and meta refresh.

## Questions

### Do I need more than one SEO audit tool?

Yes, but keep it lean. Use a desktop crawler to see the site, Search Console for truth, and one speed tool. Add a suite if you plan content and link work. Avoid buying two big suites.

### Are free SEO audits any good?

They catch basics on a single URL. They do not read your whole site or your search data. Run one as a start, then crawl your site and read Search Console and PageSpeed Insights.

### How often should I run an audit?

Crawl after each deploy that touches routing, templates or metadata. Check Search Console weekly for indexing errors and rising queries. Run a fuller review each quarter, or after a redesign or migration.

### Should I crawl staging or production?

Crawl both. Staging catches issues before they ship. Production confirms what users and bots see. Keep staging behind auth or blocked from indexing. Never leave a noindex on production after launch.

### Can AI replace an SEO audit?

AI can summarise findings and suggest next steps. It cannot see your business goals or your margin. Treat AI as a helper to rank fixes, not a source of truth. Search Console and real users decide.

### Where do backlinks fit in an audit?

Check referring domains, broken backlinks and risky patterns. Use Ahrefs, Semrush, Moz or Majestic. Then plan outreach and content that earns links. Do not fixate on one domain score. Relevance and quality matter more.

## Read next

- [An SEO audit checklist for a small site: forty checks in order](https://porteur.ai/guides/seo-audit-checklist): Run these forty SEO checks in order on a small site. The tool to use, what a fail looks like, and what to fix next, in plain steps.
- [Technical SEO checklist for a small site](https://porteur.ai/guides/technical-seo-checklist): Run these 20 technical SEO checks, in order. Each shows how to check it free and what fixed looks like for a site under 1,000 pages.
- [How to use Google Search Console in ten minutes a week](https://porteur.ai/guides/how-to-use-google-search-console): A quick weekly routine: set four filters, compare 28 days, check pages then queries, and fix three findings, without getting lost in noise.
- [Core Web Vitals for a product site: the three numbers](https://porteur.ai/guides/core-web-vitals): The product founder’s guide to LCP, CLS and INP: what Google measures, why phones decide the pass, common causes, and how to test and fix.
- [Reading a Lighthouse score on a phone](https://porteur.ai/guides/lighthouse-score): Use the mobile Lighthouse run to judge speed and UX. See what each score means, how lab and field data differ, and what to fix first.
- [Internal linking for a small site: which pages link to which](https://porteur.ai/guides/internal-linking-for-seo): Decide which pages rank. Build hubs, write clear anchors, fix orphans, and crawl your site to map links you control.
- [The best SEO tools for a startup: a stack for one founder](https://porteur.ai/guides/best-seo-tools-for-startups): The startup SEO tool stack by stage: free set before traffic, add a crawler and rank view when clicks start, then one suite when you are growing.
- [SEO plugin](https://porteur.ai/glossary/seo-plugin): An SEO plugin adds the missing SEO fields to your CMS. See what it changes, what it cannot do, how to measure impact, and whether you need one.

Drop your homepage URL and get a free check that reads your site, the searches around it and the rivals on them in about thirty seconds, with three findings shown whole. Free check: https://porteur.ai/