Best Free SEO Audit Tools 2026 Compared: Which Ones Check AEO & GEO?

The SEO Audit Tool Landscape Has Changed

Most SEO audit tools still only check traditional ranking factors — meta tags, broken links, page speed, and backlinks. But in 2026, with over 55% of Google searches now showing AI Overviews, you need tools that also evaluate your AEO (Answer Engine Optimization) and GEO (Generative Engine Optimization) readiness. An audit that ignores how AI systems see your content is an incomplete audit.

We tested, compared, and documented 8 of the most popular SEO audit tools available in 2026. Our goal was simple: provide an honest, transparent comparison so you can choose the right tool for your specific needs. Every tool in this list has genuine strengths. The question is not which tool is "best" in absolute terms — it is which tool is best for your use case.

To be fully transparent: we built seoscore.tools, one of the tools in this comparison. We have a clear bias, and we are not going to pretend otherwise. What we can promise is that we will be honest about every tool's strengths and limitations, including our own. We believe the data speaks for itself.

SEO Audit Tools Comparison Table (2026)

This table compares all 8 tools across the features that matter most in 2026: total checks, category coverage, pricing, auto-fix capabilities, and WordPress plugin availability. Scroll horizontally on mobile to see all columns.

Individual Tool Reviews

Below is an honest assessment of each tool. We highlight what each tool does well, what it does not cover, who it is best suited for, and what it costs. We believe every tool on this list provides genuine value — the right choice depends entirely on your needs.

1. seoscore.tools — Free, 260+ Checks, SEO + AEO + GEO

What it does well: seoscore.tools is the only free tool we are aware of that scans across all three categories: traditional SEO, AEO, and GEO. It runs 260+ individual checks in seconds, requires no signup or account creation, and delivers instant results with a color-coded score breakdown. The scanner evaluates technical SEO (meta tags, HTTPS, canonical tags, robots.txt, schema validation, security headers, Core Web Vitals), on-page optimization (headings, content structure, images, links, readability), AEO readiness (FAQ schema, Q&A formatting, speakable markup, citation readiness, content extractability), and GEO readiness (AI Overview optimization, data presence, comparison tables, comprehensive coverage, semantic structure).

What it misses: seoscore.tools is a single-page scanner. It does not crawl your entire site for broken links across hundreds of pages, it does not track keyword rankings over time, and it does not provide backlink analysis. For those capabilities, you need a crawler like Screaming Frog or a competitive intelligence platform like Ahrefs or Semrush.

Pricing: Completely free. No trial limits, no daily scan caps, no account required. The companion SEO Autopilot WordPress plugin offers a free tier and a Pro version at $79 one-time for auto-fixing issues directly in WordPress.

Best for: Anyone who needs a quick, comprehensive audit covering SEO, AEO, and GEO. Particularly valuable for WordPress site owners, content creators, and small businesses who want actionable insights without paying for enterprise tools.

2. Google Lighthouse — Free, Performance-Focused

What it does well: Google Lighthouse is an open-source tool built directly into Chrome DevTools and available at PageSpeed Insights. It excels at performance measurement: Core Web Vitals (LCP, INP, CLS), accessibility auditing, progressive web app compliance, and best practices for web development. Because it is built by Google, its performance metrics are authoritative and directly aligned with what Google uses for ranking. The accessibility audit is particularly thorough, catching issues that most SEO tools ignore entirely.

What it misses: Lighthouse is not an SEO audit tool in the comprehensive sense. Its "SEO" section covers only basic checks (meta tags exist, page is indexable, links have descriptive text). It does not check schema markup quality, content optimization, AEO readiness, GEO signals, or any of the deeper on-page factors that affect rankings. It also does not provide any keyword analysis or competitive insights.

Pricing: Completely free. Built into every Chrome browser and available via API.

Best for: Developers and technical SEOs who need authoritative Core Web Vitals data, accessibility auditing, and performance optimization guidance. Use alongside a more comprehensive SEO tool for a complete audit.

3. SEOptimer — Simple Reports for Small Businesses

What it does well: SEOptimer provides clean, easy-to-understand SEO reports that are ideal for small business owners who are not SEO experts. The interface is straightforward, the reports are visually appealing, and the recommendations are written in plain language. It covers the fundamentals well: meta tags, heading structure, image optimization, page speed, mobile-friendliness, and social media presence. The white-label reporting feature (on paid plans) is excellent for agencies presenting results to clients.

What it misses: SEOptimer does not check AEO or GEO readiness. Its audit depth is relatively shallow compared to more specialized tools — it catches the obvious issues but may miss nuanced technical problems. The free version is heavily limited, showing only a partial report without detailed recommendations.

Pricing: Free for basic reports. Paid plans start at $19/month (White Label at $29/month, White Label & Embedding at $59/month). Annual cost: $228–$708.

Best for: Small business owners who want simple, non-technical SEO reports, and agencies that need white-label reporting for clients.

4. Sitechecker — Solid Site-Wide Crawling

What it does well: Sitechecker offers a strong site-wide crawling capability that checks multiple pages at once, identifying broken links, redirect chains, duplicate content, and technical issues across your entire site. It provides ongoing monitoring with alerts when new issues appear, which is valuable for catching problems before they impact rankings. The interface is modern and well-organized, with clear prioritization of issues by severity.

What it misses: No AEO or GEO auditing. The free tier is very limited (one-time scan of a few pages). Backlink analysis is basic compared to specialized tools. The tool focuses primarily on technical SEO and on-page fundamentals without venturing into AI search readiness.

Pricing: Free for a limited one-time scan. Paid plans start at $49/month (Basic), with Pro at $149/month. Annual cost: $588–$1,788.

Best for: Website owners who need ongoing site-wide monitoring and want to catch technical issues across hundreds of pages. Strong for sites that publish frequently and need continuous crawling.

5. Seobility — Thorough On-Page Analysis

What it does well: Seobility provides a thorough on-page SEO analysis with a generous free tier (one project, 1,000 pages crawled). The tool excels at identifying content quality issues: thin content, duplicate content, missing ALT tags, broken links, and keyword cannibalization. The TF*IDF analysis for content optimization is genuinely useful for understanding how your content compares to top-ranking pages. Their keyword monitoring includes daily rank tracking even on the free plan (limited to 10 keywords).

What it misses: No AEO or GEO auditing. The free plan limits you to one project with a 1,000-page crawl cap. Schema markup analysis is basic (checks if it exists, but does not validate structure or completeness). Does not offer a WordPress plugin for direct integration.

Pricing: Free tier (1 project, 1,000 pages, 10 keywords). Premium at $50/month, Agency at $200/month. Annual cost: $600–$2,400.

Best for: Content-focused SEO professionals who need deep on-page analysis and TF*IDF content optimization. The generous free tier makes it accessible for individuals managing a single website.

6. SE Ranking — All-in-One with Strong Rank Tracking

What it does well: SE Ranking is a well-rounded SEO platform with particularly strong rank tracking capabilities. It tracks keyword positions across Google, Bing, Yahoo, and YouTube with daily updates and location-specific results. The site audit covers technical SEO comprehensively, and the competitive analysis feature lets you compare your site against competitors. The content marketing module and backlink checker add significant value for teams that need an all-in-one platform.

What it misses: No AEO or GEO auditing. The free trial is limited to 14 days, after which all features require a paid subscription. While the platform covers many areas, it does not go as deep in any single area as specialized tools (for example, Ahrefs for backlinks or seoscore.tools for AEO/GEO). No auto-fix capability for identified issues.

Pricing: 14-day free trial. Essential at $55/month, Pro at $109/month, Business at $239/month. Annual cost: $660–$2,868.

Best for: Marketing teams and agencies that need an all-in-one platform with strong rank tracking, competitive analysis, and a moderate price point. Good middle ground between free tools and premium platforms like Semrush.

7. Ahrefs Webmaster Tools — Free, Backlink-Focused

What it does well: Ahrefs Webmaster Tools (AWT) is the free version of Ahrefs, one of the most respected SEO platforms in the industry. AWT gives you access to Site Audit (crawling up to 5,000 pages) and Site Explorer (limited backlink data for your verified sites). Ahrefs' backlink database is among the largest and most frequently updated in the industry, making AWT genuinely valuable for understanding your link profile. The site audit identifies technical issues, content quality problems, and HTML tag issues with clear explanations and fix recommendations.

What it misses: No AEO or GEO auditing. The free version only works for sites you verify ownership of (via Google Search Console connection), so you cannot audit competitors. No keyword tracking, no content explorer, and no competitive analysis. The backlink data is limited compared to paid Ahrefs plans. No auto-fix capabilities.

Pricing: Free (for verified sites only). Full Ahrefs plans start at $99/month (Lite), with Standard at $199/month. Annual cost for paid: $1,188–$2,388.

Best for: Site owners who want free access to industry-leading backlink data and a solid technical site audit. Excellent complement to tools that focus on AEO/GEO but lack backlink analysis.

8. Semrush — Enterprise-Grade SEO Suite

What it does well: Semrush is the industry standard for competitive SEO analysis, and for good reason. It excels at keyword research (the largest keyword database in the industry), competitive intelligence (domain vs. domain comparisons, traffic analytics, advertising research), and comprehensive site auditing. The Site Audit tool crawls thousands of pages and identifies 140+ issue types with clear severity ratings. The Position Tracking tool monitors keyword rankings with granular location and device targeting. Content marketing features, including the SEO Writing Assistant, help teams create optimized content at scale.

What it misses: Semrush does not currently check AEO or GEO readiness. At $140+/month, it is the most expensive tool in this comparison and overkill for many small businesses. The free plan is severely limited (10 keyword searches per day, one project). The learning curve is steeper than simpler tools because of the sheer number of features. No auto-fix capability for WordPress.

Pricing: Free tier (very limited: 10 requests/day). Pro at $139.95/month, Guru at $249.95/month, Business at $499.95/month. Annual cost: $1,680–$6,000.

Best for: Enterprises, large agencies, and serious SEO professionals who need the deepest competitive intelligence, the largest keyword database, and comprehensive multi-project management. Worth the investment if keyword tracking and competitor analysis are your primary needs.

Feature Coverage Comparison

This chart shows how the top 4 tools compare in their coverage of traditional SEO checks versus AEO and GEO checks. The difference is dramatic: while most tools offer solid traditional SEO coverage, AEO and GEO remain a blind spot for all but one.

The chart makes the gap clear: seoscore.tools is the only tool with meaningful AEO and GEO coverage. The other tools focus exclusively on traditional SEO checks, which remains important but represents only one dimension of search visibility in 2026. This is not a criticism of those tools — they were built for traditional SEO and they do it well. The gap exists because AEO and GEO are newer disciplines that have not yet been integrated into most platforms.

Annual Cost Comparison

For budget-conscious site owners and small businesses, cost matters. This chart shows what you would spend per year on each tool at their lowest paid tier (or free, if no paid tier is required). The differences are substantial.

The cost difference is dramatic. A Semrush Pro subscription costs $1,680 per year. SE Ranking costs $660. Even the most affordable paid tool, SEOptimer, costs $228 annually. Meanwhile, seoscore.tools performs more total checks (260+ vs 140) at zero cost. This does not mean Semrush is overpriced — it provides enormous value through keyword tracking, competitive intelligence, and other features that seoscore.tools does not offer. The point is that for auditing specifically, you can get comprehensive coverage for free.

The AEO & GEO Gap: Why Most Tools Miss It

Of the 8 tools we compared, only one checks AEO and GEO readiness. This is not because other tool makers are negligent — it is because AEO and GEO are fundamentally new audit categories that require different evaluation criteria than traditional SEO.

Traditional SEO auditing checks whether search engine crawlers can access, understand, and rank your pages. The metrics are well-established: page speed, HTTPS, meta tags, heading structure, broken links, schema markup, mobile-friendliness. These have been standard audit items for over a decade.

AEO auditing checks whether AI assistants — ChatGPT, Perplexity, Claude, Google AI Overview, Siri, Alexa — can find, extract, and cite your content as answers. This requires checking for FAQ schema, Q&A content formatting, speakable markup, citation-ready content structure, and content extractability. These are newer evaluation criteria that most tool architectures were not designed to assess.

GEO auditing checks whether generative AI systems will choose your content as a source when producing comprehensive answers. This goes beyond extractability to evaluate comprehensiveness, data density, citation patterns, comparison tables, expertise signals, and semantic structure. GEO is the newest audit category, and defining what to check is itself a research challenge.

The data from our scans across thousands of websites tells a clear story: the average site scores 72% on traditional SEO but only 31% on combined AEO/GEO readiness. This gap represents both a risk and an opportunity. It is a risk because AI search is growing rapidly — if your content is invisible to AI systems, you are losing an increasing share of potential traffic. It is an opportunity because most of your competitors have the same blind spot, meaning even basic AEO/GEO optimization can put you significantly ahead.

We believe other tools will eventually add AEO and GEO checks as AI search becomes more dominant. In the meantime, the gap exists, and it creates a measurable advantage for site owners who address it now.

When to Use Which Tool: A Decision Guide

Every tool serves a different purpose. Rather than declaring a single "winner," here is a practical guide for choosing the right tool based on what you actually need to accomplish.

The most effective approach in 2026 is combining two or three complementary tools rather than relying on a single tool for everything. A strong free combination: seoscore.tools (SEO + AEO + GEO audit) + Google Lighthouse (performance) + Ahrefs Webmaster Tools (backlinks) + Google Search Console (indexation data). This gives you comprehensive coverage at zero cost.

Frequently Asked Questions

Key Takeaways

1. No single tool does everything. Each tool in this comparison has genuine strengths. The best approach is combining two or three complementary tools rather than searching for one perfect solution. A strong free stack: seoscore.tools + Google Lighthouse + Ahrefs Webmaster Tools + Google Search Console.
2. AEO and GEO are the biggest gap. Of 8 tools tested, only seoscore.tools checks AEO and GEO readiness. With 55% of Google searches now showing AI Overviews, this gap represents both a blind spot for most site owners and a competitive opportunity for those who address it.
3. Free tools can outperform paid tools for auditing. seoscore.tools runs 260+ checks for free — more than Semrush (140 checks at $140/month). Paid tools justify their cost through keyword tracking, competitive intelligence, and historical data, not through more audit checks.
4. Be honest about what you need. If you primarily need keyword tracking and competitor analysis, invest in SE Ranking or Semrush. If you need backlink data, use Ahrefs. If you need a comprehensive SEO + AEO + GEO audit, use seoscore.tools. Match the tool to the task.
5. WordPress users have an additional option. The SEO Autopilot plugin goes beyond auditing by automatically fixing issues it finds — meta tags, schema markup, headings, images — with one-click auto-fix and a backup/undo safety system. This turns an audit from a report into immediate action.
6. Audit regularly, not once. Whatever tools you choose, use them continuously. Weekly quick scans, monthly comprehensive audits, quarterly deep dives. SEO issues compound exponentially — catching them early saves months of recovery time.