Free SEO audit tools check a website for technical and on-page problems, such as broken links, crawl errors, slow pages, and missing meta tags, without a paid subscription. Each has limits: a crawl cap, a daily check allowance, or a trial period.
The nine below include permanently free tools (Google Search Console, Ahrefs Free, Screaming Frog), free tiers of paid platforms (Semrush, Seobility, Rank Math), and trials (GTmetrix, Search Atlas). For each one, you'll find what the free version covers, its limits, and what paid plans cost. Pricing and limits were checked on each vendor's site on September 29, 2026.
What to Look for in a Free SEO Audit Tool
Look first at what the free version checks and how much of your site it covers. Most free tools cover one area well, so a combination of two or three usually fills the gaps. Check for:
- Crawl limit: how many pages the free version audits (Screaming Frog stops at 500 URLs; Semrush at 100 pages a month).
- Coverage: technical errors, on-page elements, page speed, backlinks, or a mix.
- Data source: first-party Google data (Search Console) or a third-party crawler.
- Access terms: permanently free, a daily allowance, or a trial that ends.
- Fixes: whether the tool only reports issues or also helps you resolve them.
The table summarizes the free version of each tool.
| Tool | Free version | Main free limit |
|---|---|---|
| Search Atlas | 7-day free trial | Trial ends after 7 days |
| Google Search Console | Free | Performance data kept for 16 months |
| Ahrefs Free | Free for verified sites | 5,000 Site Audit crawl credits per project per month |
| Semrush | Free account | 10 reports per day across all tools; Site Audit up to 100 pages a month |
| GTmetrix | Free trial | 5 tests a month for 3 months |
| Rank Math | Free WordPress plugin | Keeps Google data for 90 days |
| AIOSEO Analyzer | Free Chrome extension | Checks one page at a time |
| Screaming Frog SEO Spider | Free download | 500 URLs per crawl |
| Seobility | Free Basic plan | 5 tool credits a day; 100 pages per crawl |
9 Free SEO Audit Tools Compared
Each entry below covers what the tool audits, what the free version includes, its limits, and paid pricing.
1. Search Atlas
Search Atlas audits a site and then fixes what it finds. Site Auditor and On-Page Audit find the technical and on-page issues, and OTTO SEO deploys the fixes through a single pixel on any CMS. The 7-day free trial gives full platform access, including a 30-minute onboarding session.
Site Auditor crawls up to 20 pages per second and scores site health on a 0 to 1,000 scale, with Core Web Vitals, indexability, and page-by-page health in an Overview, Page Explorer, and Domain Level view. It re-crawls every 7 days by default, and each issue comes with how-to-fix guidance.
The On-Page Audit benchmarks a single URL against the pages ranking for up to 3 target keywords, covering content quality, authority, technical SEO, and page experience, including desktop and mobile PageSpeed Insights scores. SCHOLAR then grades content across 12 dimensions, including factuality, information gain, and readability.
Popular Features
- Site Auditor: Health score on a 0 to 1,000 scale, crawl errors, indexability, Core Web Vitals, and a 7-day automatic re-crawl.
- OTTO SEO: Deploys technical and on-page fixes, such as titles, meta descriptions, schema, and internal links, through one pixel on any CMS. Every change is logged and can be rolled back.
- On-Page Audit: Scores a URL against the ranking competition for up to 3 target keywords.
- Keyword Research: Search volume, keyword difficulty, and CPC across a 5.2 billion+ keyword database.
- Report Builder: Custom reports that combine audit, backlink, and competitor data.
- SCHOLAR: Grades content across 12 dimensions against the pages ranking for the target keyword.
Limitations
- The trial lasts 7 days, and paid plans start at $99/month billed monthly, the highest entry price on this list.
- Audit volume depends on the plan: 5 Site Auditor projects and 50,000 pages crawled per month on Starter.
Pricing
The 7-day free trial includes full platform access. Paid plans:
| Starter | Growth | Pro | Agency | |
|---|---|---|---|---|
| Billed monthly | $99/month | $199/month | $399/month | $999/month |
| Billed annually | $79/month | $159/month | $319/month | From $999/month |
| OTTO SEO projects | 1 | 2 | 4 | 10 |
| User seats | 1 | 3 | 5 | 10 |
| Site Auditor projects | 5 | 10 | 100 | 999 |
| Pages crawled per month | 50,000 | 100,000 | 10,000,000 | 100,000,000 |
| On-page audits | 40 | 100 | 200 | 500 |
| Google Search Console projects | 5 | 15 | 100 | 999 |
Source: Search Atlas pricing.
2. Google Search Console
Google Search Console (GSC) is Google's free service for checking how Google crawls, indexes, and ranks your site. It is the only tool on this list that reports first-party Google data, and your site does not need it to appear in search results.
GSC shows which pages Google has indexed and why others were excluded, lets you request indexing for new or updated pages, and reports the queries, impressions, and clicks each page earns. It also emails alerts for indexing errors, security issues, and manual actions.
The Links report shows which sites link to yours and which of your pages they link to.
Popular Features
- Crawl Stats: See how often Googlebot crawls your site and which responses it gets.
- Core Web Vitals: Field data for LCP, INP, and CLS, grouped by URL.
- Indexing Fixes: Identify and resolve indexing issues, and request re-indexing for new or updated content.
- Search Performance Reports: Analyze how often your site appears in search results, which queries drive traffic, and click-through rates.
- Alerts and Notifications: Email alerts for indexing errors, security issues, and manual actions.
- Date comparisons: Compare two date ranges in the Performance report to find pages losing clicks or impressions.
Limitations
- GSC reports problems but rarely explains how to fix them.
- Performance data covers the last 16 months only.
- It covers Google only; Bing has its own Bing Webmaster Tools.
- Google retired the Mobile Usability report in December 2023, so mobile checks now rely on Lighthouse or PageSpeed Insights.
Pricing
- Google Search Console is free.
3. Ahrefs Free (formerly Ahrefs Webmaster Tools)
Source: Ahrefs
Ahrefs Free, previously called Ahrefs Webmaster Tools, gives site owners free access to Ahrefs Site Audit and Site Explorer for sites they verify. Site Audit checks for more than 170 common SEO issues and explains how to fix each one.
The free tier covers any number of verified sites, with 5,000 Site Audit crawl credits per project each month. Site Explorer shows up to 1,000 backlinks and keywords at a time for your own sites.
Popular Features
- Site Audit: Crawls your site for 170+ technical and on-page issues, such as broken links, redirect problems, and missing meta tags.
- Site Explorer: Backlinks, referring domains, and organic keywords for your verified sites, up to 1,000 rows at a time.
- Web Analytics: Privacy-focused site analytics, free for up to 1 million events.
- SEO Toolbar: A browser extension with on-page SEO data for any page.
Limitations
- Only sites you verify can be audited; you cannot audit a competitor's site for free.
- Keywords Explorer and Rank Tracker are not included in the free tier.
- Site Explorer data is capped at 1,000 backlinks and keywords at once.
Pricing
| Plan | Billed monthly | Billed annually |
|---|---|---|
| Free | $0 | $0 |
| Starter | $29/month | No annual option |
| Lite | $129/month | $108/month ($1,290/year) |
| Standard | $249/month | $208/month ($2,490/year) |
| Advanced | $449/month | $374/month ($4,490/year) |
| Enterprise | $1,499/month, annual commitment |
Source: Ahrefs pricing and Ahrefs Free.
4. Semrush Free Tools
Source: Semrush
Semrush Site Audit checks a site for crawlability, page speed, internal linking, HTTPS, and markup issues. A free Semrush account includes it for one project, up to 100 pages a month.
Issues are grouped into errors, warnings, and notices, each with a note on why it matters and how to fix it. The 100-page cap makes the free version a fit for small sites or a spot check of key pages.
Popular Features
- Site Audit: Up to 100 pages a month on the free account, with a site health score and prioritized issues.
- Website Authority Checker: Authority Score and a backlink summary for any domain.
- Position Tracking: Tracks up to 10 keywords on the free account.
- SERP Checker: Shows the Google results for a keyword in a chosen location, with SERP features.
- Keyword Overview: Monthly search volume, keyword difficulty, and trend data for a keyword.
Limitations
- The free account allows 10 reports per day in total, shared across every tool.
- Site Audit covers only 100 pages a month and one project.
Pricing
| Plan | Billed monthly | Billed annually | Projects | Keywords tracked daily |
|---|---|---|---|---|
| Free | $0 | $0 | 1 | 10 |
| SEO | $139/month | $117.33/month | 5 | 500 |
| Starter | $199/month | $165.17/month | 5 | 500 |
| Pro+ | $299/month | $248.17/month | 15 | 1,500 |
| Advanced | $549/month | $455.67/month | 40 | 5,000 |
| Enterprise | Custom | Custom |
Source: Semrush pricing.
5. GTmetrix
GTmetrix tests how fast a page loads and why, using Lighthouse metrics, Web Vitals, and its own GTmetrix Grade, with a waterfall chart of every request. It is a page speed tool rather than a full SEO auditor, so it pairs well with a crawler.
The free version is a trial: 5 tests a month for 3 months, from 2 test regions, with reports kept for 1 week. It requires an account with a verified email address.
Popular Features
- Performance reports: Lighthouse scores, Web Vitals, and a GTmetrix Grade for each test.
- Waterfall chart: Every request the page makes, with its size and timing.
- Monitoring: One monitored URL on the free trial, tested daily, weekly, or monthly.
- CrUX data: Chrome real-user data for the page, with trends on paid plans.
Limitations
- The free version ends after 3 months and allows 5 tests a month.
- Free tests run from 2 regions; paid plans reach up to 28 test locations.
- It measures page speed only, not other SEO issues.
Pricing
| Plan | Billed monthly | Billed annually | Tests per month | Test locations |
|---|---|---|---|---|
| Free trial | $0 | $0 | 5, for 3 months | 2 |
| Lite | $5.99/month | $4.99/month | 50 | 5 |
| Core | $11.99/month | $9.99/month | 150 | 10 |
| Advanced | $29.99/month | $24.99/month | Unlimited | 28 |
| Expert | $59.99/month | $49.99/month | Unlimited | 28 |
| Enterprise | Contact sales |
Source: GTmetrix pricing.
6. Rank Math
Source: Rank Math
Rank Math is a WordPress SEO plugin with a built-in SEO Analyzer that runs more than 30 tests on your site and returns a score, warnings, and a list of failed tests to fix. The free version works only on WordPress sites.
Because it runs inside WordPress, it can also fix some issues directly, such as redirects and meta tags.
Popular Features
- SEO Analyzer: 30+ tests covering meta tags, headings, links, images, and site settings.
- SEO score: One number summarizing the test results.
- Warnings and failed tests: A prioritized list of what to fix.
- 404 Monitor: Logs visits to missing pages so you can fix or redirect them.
- Redirections: Creates and manages redirects from the WordPress dashboard.
Limitations
- It works only on WordPress sites.
- The free version keeps Google Analytics and Search Console data for 90 days (180 days on PRO).
- Many automation features are in the paid plans only.
Pricing
Paid plans are billed annually. Our pricing check could only load euro prices, so the figures below are in EUR; check Rank Math pricing for your local currency.
| Plan | First year | Renewal | Websites |
|---|---|---|---|
| Free | €0 | €0 | Unlimited |
| PRO | €6.99/month | €8.99/month (€107.88/year) | Unlimited personal sites |
| Business | €22.99/month | €27.99/month (€335.88/year) | 100 client sites |
| Agency | €52.99/month | €64.99/month (€779.88/year) | 500 client sites |
7. AIOSEO All in One SEO Analyzer (Chrome Extension)
Source: AIOSEO
All in One SEO Analyzer is AIOSEO's free Chrome extension for checking the page open in your browser. It returns an SEO score and lists the title, meta description, canonical, robots settings, headings, links, images, and schema for that page. AIOSEO also offers the same check as a free web-based SEO Analyzer.
Popular Features
- SEO score: A score for the current page with a list of passed and failed checks.
- Technical checks: Indexability, canonical tag, robots meta tag, and links to robots.txt and the sitemap.
- Content and markup: Headings, links, image alt text, schema, and Open Graph and Twitter tags, with CSV export.
Limitations
- It checks one page at a time and does not crawl a site.
- Fixes require the AIOSEO WordPress plugin or manual edits.
Pricing
The Chrome extension is free. The AIOSEO WordPress plugin is paid annually:
| Plan | First year | Regular price |
|---|---|---|
| Basic | $49.50/year | $99/year |
| Plus | $99.50/year | $199/year |
| Pro | $199.50/year | $399/year |
| Elite | $299.50/year | $599/year |
Source: AIOSEO pricing.
8. Screaming Frog SEO Spider
Source: Screaming Frog
Screaming Frog SEO Spider is a desktop crawler for Windows, macOS, and Linux that audits a site's technical and on-page SEO. The free version crawls up to 500 URLs per crawl, which covers most small sites.
Popular Features
- Website crawling: Finds broken links, redirects, duplicate content, and crawl errors, up to 500 URLs on the free version.
- Technical SEO Audits: Identify SEO issues like missing meta tags, improper redirects, and inaccurate canonicalization settings.
- Custom Extraction (paid): Pulls specific data from pages with XPath, CSS selectors, or regex.
- Site visualizations: Crawl and directory tree diagrams of the site structure, included in the free version.
- Integrations (paid): Pulls Google Analytics, Search Console, and PageSpeed Insights data into the crawl.
Limitations
- The free version stops at 500 URLs per crawl.
- Crawl saving, scheduling, JavaScript rendering, custom extraction, and the Google integrations need a paid licence.
- The interface assumes technical SEO knowledge.
Pricing
- Free: $0, up to 500 URLs per crawl.
- Paid licence: $279/year per user, with no crawl limit and all features. Volume rates drop to $265 (5 to 9 licences), $249 (10 to 19), and $235 (20+). There is no monthly option.
Source: Screaming Frog pricing.
9. Seobility
Source: Seobility
Seobility is an SEO platform whose free Basic plan crawls one project up to 100 pages and tracks 10 keywords, with no time limit. The free plan also includes 5 tool credits a day, shared across its SEO Checker, Keyword Checker, Ranking Checker, and TF*IDF tool.
Popular Features
- SEO Checker: Check any URL for technical and on-page issues.
- Keyword Checker: Check how pages are optimized for one or more keywords.
- Ranking Checker: Checks where a page ranks for a keyword by region and device.
- TF*IDF Tool: Compares the terms on your page with the terms on competing pages.
Limitations
- The free crawl covers 100 pages for one project.
- The 5 daily credits are shared across all four checkers.
Pricing
Paid plans include a 14-day free trial. Annual billing saves 20%; prices exclude VAT.
| Plan | Billed monthly (USD) | Billed annually (EUR) | Projects | Pages per crawl |
|---|---|---|---|---|
| Basic | $0 | €0 | 1 | 100 |
| Premium | $69.90/month | €575.04/year | 3 | 25,000 |
| Professional | $109.90/month | €959.04/year | 7 | 50,000 |
| Agency | $239.90/month | €2,015.04/year | 20 | 100,000 |
Source: Seobility pricing. Annual prices were only available in euros during our check.
Which Free SEO Audit Tool Should You Use?
The right free SEO audit tool depends on what you need to check. For most sites, a free combination covers the basics:
- Indexing and search performance: Google Search Console.
- A full crawl of a small site: Screaming Frog (up to 500 URLs) or Ahrefs Free (for verified sites).
- Page speed: GTmetrix or Google PageSpeed Insights.
- WordPress sites: Rank Math's SEO Analyzer.
Free tools find issues; the fixes are still manual. If you want the audit and the fixes handled in one place, the Search Atlas 7-day free trial includes Site Auditor and OTTO SEO, which deploys technical and on-page fixes on its own. For a step-by-step process, see our guide to running an SEO site audit.
