2. Detailed SEO Extension – The Free Swiss Army Knife
Created by Glen Allsopp, an SEO professional who has lived and breathed search engine optimization for years, Detailed has become a reference in the industry.
What the extension does:
One click and you see the complete SEO structure of a page. Title tag, meta description, heading tags, canonical URL, hreflang, structured data. Everything is there, clean and readable.
The strengths:
It is fast, free, requires no account creation, and has no aggressive upsells. The interface is clean and gets straight to the point. You can also right-click on any text to search for duplicates online.
The limitations:
No backlink data, no search volume, no competitor analysis. It is an on-page audit tool, nothing more.
Who it is for:
Anyone who wants to quickly analyze the SEO structure of a page without unnecessary complexity.
Price: Free
3. SEOquake – The Power of Semrush in Your Browser
SEOquake is the official extension from Semrush. If you already use Semrush, it is a must-have.
What the extension does:
You get SEO metrics directly in Google SERPs. Number of indexed results, keyword density, complete on-page analysis, and CSV data export.
The strengths:
The extension displays metrics directly in search results, allowing you to compare competitors without opening each page. You can also run a complete SEO audit of any page.
The limitations:
To unlock all features like Domain Authority and backlink data, you need a Semrush account. Without it, the extension remains useful but limited.
Who it is for:
Semrush users who want to leverage their data directly in Chrome.
Price: Free (advanced features with Semrush)
4. Keyword Surfer – Keyword Research Without Leaving Google
Keyword Surfer is probably the most underrated free extension on the market.
What the extension does:
When you search on Google, the extension automatically displays the search volume of the keyword, estimated CPC, and similar keyword suggestions. Directly in the SERP, without opening another tool.
The strengths:
It is free, truly free. No "freemium" version that limits you to 3 searches per day. You can also see the estimated traffic of ranking websites, which gives you an idea of the potential for each position.
The limitations:
Search volumes are estimates, not exact data. For in-depth analysis, you will need a more comprehensive tool.
Who it is for:
Anyone who does keyword research regularly and wants quick data without switching tabs.
Price: Free
5. Ahrefs SEO Toolbar – For Ahrefs Enthusiasts
If Ahrefs is your primary tool, this extension will become your best friend.
What the extension does:
The extension provides an instant on-page SEO report for every page you visit. You can also use it as a broken link checker and redirect tracer.
The strengths:
With an Ahrefs account, you unlock advanced metrics like Domain Rating, Page Rating, and backlink count. You see this data directly in the SERPs, which facilitates competitive analysis.
The limitations:
Without an Ahrefs account, the extension remains basic. And Ahrefs is not cheap.
Who it is for:
Ahrefs users who want their data accessible everywhere.
Price: Free (advanced features with Ahrefs)
6. MozBar – The Timeless Classic
MozBar has been around for years, and there is a reason for that. It is reliable, simple, and it works.
What the extension does:
The extension displays Domain Authority and Page Authority for each website directly in search results. You can also perform basic on-page analysis and check a page's links.
The strengths:
Moz's DA and PA remain reference metrics in the industry. Even if they are not perfect, they provide a good indication of a domain's strength. The extension is stable and does not slow down your browser.
The limitations:
The interface is starting to show its age. And like the others, advanced features require a Moz Pro account.
Who it is for:
Those who want a quick domain authority metric without complications.
Price: Free with Moz account
7. SEO Minion – The Versatile Assistant
SEO Minion is the kind of extension that does a bit of everything, and does it well.
What the extension does:
On-page analysis, broken link checking, SERP preview, hreflang analysis, and local search simulation. It is a true Swiss army knife.
The strengths:
The SERP preview function is excellent for optimizing title tags and meta descriptions. You see exactly what your result will look like in Google. Broken link checking is also very practical for technical audits.
The limitations:
The interface is not the prettiest, and some functions may seem redundant if you already have other extensions.
Who it is for:
SEO professionals who want a versatile tool without multiplying extensions.
Price: Free
8. Keywords Everywhere – Keyword Data Everywhere
Keywords Everywhere transforms your browser into a permanent keyword research tool.
What the extension does:
The extension displays search volume, CPC, and competition for keywords on Google, YouTube, Amazon, Bing, and other platforms. You also see related keywords and trends.
The strengths:
Multi-platform coverage is a real advantage. If you do YouTube or Amazon SEO, it is particularly useful. You can also create keyword lists and export them.
The limitations:
Unlike Keyword Surfer, Keywords Everywhere works on a credit system. You purchase credits that are consumed with each search. This can add up quickly if you do a lot of research.
Who it is for:
Those who do keyword research across multiple platforms and are willing to pay for reliable data.
Price: Starting at $10 for 100,000 credits
9. Lighthouse – Technical Audit by Google
Lighthouse is developed by Google itself. It is a reliable source for knowing what Google thinks of your website.
What the extension does:
The extension audits any page on performance, accessibility, best practices, and basic SEO. You get a score out of 100 for each category with detailed recommendations.
The strengths:
It is free, it is from Google, and it is brutally honest. If your website is slow or your mobile UX is poor, Lighthouse will tell you without sugarcoating it. Core Web Vitals are included.
The limitations:
The SEO audit remains basic. It checks fundamental technical elements but does not perform content or backlink analysis.
Who it is for:
Anyone who wants to ensure their website meets Google's technical standards.
Price: Free
10. Redirect Path – The Redirect Tracer
Redirect Path is a simple extension that does one thing, but does it perfectly.
What the extension does:
The extension displays the HTTP code of each visited page, whether it is a 200, 301, 302, 404, or other. It also shows redirect chains and loops.
The strengths:
When you are doing a site migration or cleaning up old URLs, this extension saves your life. You immediately see if a redirect works correctly or if you have created a problematic redirect chain.
The limitations:
It is a single-function tool. If you are looking for an all-in-one solution, this is not it.
Who it is for:
Technical SEO professionals working on migrations or who need to audit redirect structures.
Price: Free
Bonus: Wappalyzer – To Know What Powers a Website
Wappalyzer is not strictly an SEO extension, but it is indispensable for technical audits.
What the extension does:
The extension identifies the technologies used by any website. CMS, framework, hosting provider, analytics tools, e-commerce solutions — everything is covered.
Why it is useful for SEO:
Knowing that a client uses WordPress, Shopify, or a custom CMS completely changes your approach. You can anticipate technical issues, limitations, and adapt your strategy accordingly.
Price: Free
How to Choose the Right Extensions?
Before installing them all and turning your browser into a Christmas tree, ask yourself these questions.
What do you actually need?
If you mainly do keyword research, Keyword Surfer is sufficient. If you do technical audits, Sorank and Lighthouse are your allies. If you work at an agency and need to impress prospects, Sorank with its PDF export will change your life.
What tools do you already use?
If you pay for Semrush, SEOquake is essential. If you are on Ahrefs, get their toolbar. There is no point in multiplying data sources.
Will your browser survive?
Too many extensions slow down Chrome. Choose 3 to 5 maximum and disable those you do not use daily.
These extensions will not replace a proper SEO stack. But for daily work, quick analysis, and real-time decisions, they are indispensable. Install 2 or 3, test them for a week, and keep the ones that naturally integrate into your workflow. And if you manage an SEO agency and want to go beyond simple extensions, take a look at Sorank. It is designed to turn your audits into clients.
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