Running an SEO audit used to require a $100/month tool subscription. Now there are more free options than ever — but that creates a different problem. Which tools are genuinely useful, and which just give you a score out of 100 and call it a day?
We've tested every major approach. Here's an honest breakdown of what each one does well, where it falls short, and when you should use it.
Option 1: Manual SEO Checklists
A manual SEO checklist walks you through a set of items to check on your site: do you have a title tag? Is your site mobile-friendly? Do you have an SSL certificate? You can find solid free checklists from Moz, Backlinko, and dozens of SEO blogs.
What works: Manual checklists are genuinely educational. Going through one yourself helps you understand SEO fundamentals in a way that reading an automated report doesn't. They're also completely free and require no signup.
What doesn't: A thorough manual audit takes two to three hours per site. It's easy to miss things, especially technical issues that require tools to detect. There's no consistent scoring, so it's hard to track improvement over time or compare your site to a competitor's. And if you have more than a few pages, checking each one manually is impractical.
Best for: Understanding SEO basics for the first time. Not practical for regular auditing.
Option 2: Google Search Console
Google Search Console is a free tool from Google that shows you how Googlebot sees your site. You'll find data on which queries drive traffic to your site, which pages have indexing errors, Core Web Vitals performance, mobile usability issues, and whether your site has any manual penalties.
What works: The data comes straight from Google — it doesn't get more authoritative than that. Search Console will tell you when Google can't crawl a page, which is critical information you can't get anywhere else for free. The Core Web Vitals report also shows you real-world performance data from actual visitors, not just a lab test.
What doesn't: Search Console only works for sites you own and have verified. You can't use it to audit a competitor or check a site before you buy it. The interface is also not beginner-friendly — interpreting the data requires some SEO knowledge, and it won't tell you what to do, only what the problem is.
Best for: Ongoing monitoring of a site you own. Essential, but not a complete audit solution on its own.
Option 3: Google Lighthouse
Lighthouse is built into Chrome DevTools (open DevTools, go to the Lighthouse tab) and also available as a CLI tool. It scores your page on Performance, Accessibility, Best Practices, and SEO — each out of 100 — and provides a detailed breakdown of exactly what's dragging each score down.
What works: Lighthouse is thorough and technically rigorous. Google engineers built it, so its recommendations align directly with what Google cares about. The performance audit in particular is excellent — it identifies which specific resources are slowing your page down and estimates how much time each fix would save.
What doesn't: Lighthouse analyses one page at a time and produces deeply technical output. Recommendations like "Eliminate render-blocking resources" or "Avoid chaining critical requests" are accurate but not actionable for most site owners without a developer. The SEO section also covers only basic on-page factors — it doesn't look at your content quality, keyword targeting, or how you compare to competitors.
Best for: Developers optimising page performance. Too technical for most site owners to act on directly.
Option 4: Free Tiers of Paid Tools
Ahrefs, SEMrush, and Moz all offer free tiers. Ahrefs Webmaster Tools is the most generous — it's free for sites you own and shows broken links, pages with missing title tags, and basic backlink data. SEMrush's free tier gives you ten domain analyses per day. Moz's free account provides a limited site crawl.
What works: When the data is accessible, these tools are genuinely powerful. Ahrefs' backlink database in particular has no real free-tier equivalent elsewhere.
What doesn't: The free tiers are designed to show you enough to want the paid version. Crawl limits, query caps, and paywalled features mean you frequently hit walls mid-audit. You also need to create an account — which means handing over your email and accepting that you'll be targeted for upgrade emails.
Best for: Backlink research and keyword data if you're willing to work within tight daily limits.
Option 5: AI-Powered Audit Tools
AI-powered SEO audit tools like GoogleGain take a different approach. They run automated technical checks (title tags, meta descriptions, heading structure, page speed, mobile optimisation, internal linking, image alt text, and more) and then use AI to interpret the results — explaining what the issues mean for your specific site and what to prioritise first.
What works: The combination of automated checks plus AI interpretation is what makes this category genuinely useful for non-technical site owners. Instead of a raw data dump, you get a plain English explanation of what's wrong and why it matters. GoogleGain runs over 100 checks, scores your site, generates a prioritised action list, and emails you a PDF report — in about 30 seconds, with no account required. You can also audit a competitor's site, which Search Console and Lighthouse can't do.
What doesn't: AI-powered audits are better at technical and on-page SEO than at backlink analysis or ranking data, which requires proprietary databases that take years to build. For deep keyword research or backlink prospecting, you'd still want a dedicated tool.
Best for: Getting a complete, actionable picture of your site's SEO health quickly — especially useful if you're not an SEO professional.
So Which Free SEO Audit Tool Should You Use?
There's no single tool that does everything. But if you're a business owner trying to understand why your site isn't ranking and what to fix first, the practical answer is:
- Start with an AI-powered audit to get an instant overview of issues and a prioritised fix list
- Set up Google Search Console for ongoing monitoring and to catch crawl errors as they happen
- Use Lighthouse if you have a developer who can act on the performance recommendations
- Add Ahrefs Webmaster Tools if backlink monitoring matters to you
That combination covers the full picture without spending a penny — and without wading through tools that are designed to frustrate you into paying.
Try GoogleGain Free
GoogleGain runs 100+ SEO checks on any public URL and delivers a plain English report with a prioritised action plan. No account needed, no credit card, results in 30 seconds.