Confirm SEO faults the same day, from the browser
A French page shows English copy, or enquiries from one market drop overnight. Each is quick to confirm on the page itself, and confirming it the same day keeps the enquiries coming.
Below are the ten Chrome extensions we keep installed for those moments, grouped by job, and the point where a site-wide check takes over.
The ten Chrome extensions for SEO at a glance
Nine of the ten have a free version, and SEO Minion comes with a Keywords Everywhere subscription, so trying most of the set costs an afternoon. We checked every listing and pricing page on 24 October 2026.
| Extension | Best for | Cost |
|---|---|---|
| SEO Minion | On-page checks, hreflang, broken links | Keywords Everywhere Silver plan or higher |
| Ahrefs SEO Toolbar | On-page reports, redirect tracing, hreflang checks | Free, Ahrefs metrics with a paid plan |
| Detailed SEO Extension | One-click page summary | Free |
| Web Developer | Testing pages without JavaScript or CSS | Free |
| Redirect Path | Redirect chains and status codes | Free |
| Keywords Everywhere | Keyword data inside Google results | Free keyword lists, paid credits for volume |
| MozBar | Authority metrics and link highlighting | Free account, more with Moz Pro |
| Similarweb | Traffic estimates for any site | Free |
| Wappalyzer | Spotting a site's technology stack | Free account with 50 lookups a month, more on paid plans |
| Tag Assistant | Checking Google tags fire correctly | Free |
On-page and technical checks
Most faults that affect a page's traffic are visible on the page itself. These five find them in seconds, straight from the browser.
SEO Minion
SEO Minion started as a free tool and now comes with a Keywords Everywhere Silver, Gold or Platinum plan. It analyses on-page elements, highlights and filters every link on a page, checks for broken links, previews the search result in different locations, and validates hreflang tags with their return tags and x-default, the check multilingual sites need most often. Without a plan, the Ahrefs SEO Toolbar below covers the hreflang check for free.
67% of the 374,756 domains using hreflang that Ahrefs studied in 2023 had at least one hreflang issue.
Source: Ahrefs, "Over 67% of Domains Using Hreflang Have Issues (Study of 374,756 Domains)", August 2023
Ahrefs SEO Toolbar
The Ahrefs SEO Toolbar runs an on-page report, traces redirect chains, and reviews robots.txt rules, canonical tags, noindex and nofollow directives and hreflang links. Those checks are free. Ahrefs metrics such as backlinks and estimated traffic need a paid plan.
Detailed SEO Extension
The Detailed SEO Extension summarises any page in one click: title and meta description, heading structure, internal and external link counts, schema markup, and shortcuts to robots.txt and the sitemap. It is the fastest way to decide whether a page needs a closer look.
Web Developer
The Web Developer extension answers one question that matters to rankings: what does search see from the HTML alone, before any JavaScript runs? It also outlines headings, links and images and validates HTML and CSS.
Redirect Path
Redirect Path shows every hop a URL takes, with the HTTP status code at each step. Spot chains and loops at a glance and cut them to a single hop, which keeps the page fast and passes link value in full. Our technical SEO audit checklist explains what to do with what it finds.
According to Google, Googlebot generally follows 10 redirect hops when crawling for general web content.
Size up a market's keywords and competitors
What a competitor ranks for, and what it earns them, is the core of SEO competitor analysis: it tells you whether a market is worth the budget before you commit it.
Keywords Everywhere
Keywords Everywhere puts keyword data beside Google results. Keyword lists, traffic metrics and link data are free; search volume, cost per click, competition and trend charts use paid credits.
MozBar
MozBar shows Page Authority and Domain Authority (with a free Moz account), on-page elements and follow versus nofollow links. Heavier use and deeper analysis need Moz Pro.
Similarweb
A broader market research tool, the Similarweb extension is free to install and use, with no account needed. It shows how a competitor gets its visitors: estimated traffic over time, traffic sources, referrals, visits by country and top search terms for any domain. Very small sites may return partial data, so treat the numbers as estimates and read them as trends.
Wappalyzer
Wappalyzer identifies the technology behind a site: CMS, ecommerce platform, analytics tools, JavaScript frameworks and server software. Handy for competitor research and audits. Free accounts include 50 technology lookups a month; paid plans raise the limit.
Source: Wappalyzer pricing, checked 24 October 2026
Check that every tracking tag fires
Check that every tag fires, so each market shows its real strength in your conversion tracking and the next budget decision follows the right number.
Tag Assistant
Google's Tag Assistant checks that Google Analytics, Google Tag Manager and Google Ads conversion tags fire correctly, with tagassistant.google.com for in-page debugging. Google has merged the older Legacy and Companion extensions into this single extension, so install this one. Checking the tags is the usual way to find SEO results that are stronger than the reports show.
Source: Google Tag Assistant Help, "Tag Assistant extension"
Keep the set small and crawl for site-wide faults
Extensions answer questions about one page. For anything site-wide, a crawler and Search Console are still the source of truth, and the base of our technical SEO services. Keep the set small, since some read every page you visit, and respect each site's terms of service when pulling data.
