SEO Sidekick · Free Chrome extension
Free On-Page SEO Checker Extension
SEO Sidekick is a free on-page SEO checker extension for Chrome that audits the page you are viewing in one click, from meta tags and headings to schema, hreflang, indexability and AI search readiness.
- ★ 5.0 from 2 ratings
- Version 1.17.0
- Updated 18 Sep 2026
- Free · 100% local
A free SEO toolbar that opens as a side panel
SEO Sidekick is a free, private, on-page SEO toolkit. Click the toolbar icon and it opens as a docked side panel on the current page, so the page stays visible right next to your analysis. The panel follows you as you browse, which makes it quick to compare several pages in a row. There is no account, no sign-up and no analytics, and everything runs locally in your browser.
Seven SEO audit tools in one Chrome extension
Instead of switching between separate tools, you get seven in one place. The store listing also highlights a server-side versus client-side rendering check and schema fixes that come with copy-paste code.
- Broken Link Checker: reports the real HTTP status of links on the page, external links included, detects redirects and exports to CSV.
- On-Page Analyzer: title and meta description length checks, a full H1 to H6 outline with skipped-level warnings, link and image inventories, canonical, robots and viewport, Open Graph and Twitter tags, and a main-content word count that ignores nav, header, footer and sidebars.
- Structured data: detection and validation across JSON-LD, Microdata and RDFa, with a per-block JSON download.
- AI / GEO Readiness: AI crawler access, llms.txt, quotability, keyword density and readability.
- Technical & Indexability: a "Will Google index this?" verdict plus robots.txt and XML sitemap checks.
- Hreflang Validator: ISO 639-1 language codes, self-reference, duplicates and return-tag reciprocity.
- Dofollow / Nofollow Highlighter and a Snippet Preview with pixel-accurate desktop and mobile truncation.
An AI SEO assistant for AI search readiness
The AI / GEO Readiness tool is built for AI search. It audits which AI crawlers are allowed or blocked in robots.txt, including GPTBot, ClaudeBot, PerplexityBot, Google-Extended and CCBot. It checks whether the site has an llms.txt file, scores how quotable your page is for AI answers, and shows keyword density and readability alongside.
How to check whether Google will index a page
The Technical & Indexability tool gives a clear verdict by combining signals that are easy to miss when you only look at the HTML.
- Open the page and click the SEO Sidekick icon.
- Go to Technical & Indexability.
- Read the verdict, which combines the X-Robots-Tag response header, meta robots, canonical and robots.txt.
- Check the robots.txt and XML sitemap results, including whether the current page is listed in the sitemap.
Who it is for, and how it handles your data
SEO Sidekick is built for SEO professionals who want a fast, private on-page and AI search toolkit for free. It collects no data, and there is no backend and no analytics. The only network requests are the checks you run (link status, robots.txt, sitemap, response headers and hreflang targets), and they go straight from your browser to the site you are analysing.
What SEO Sidekick does not do
SEO Sidekick is an on-page tool: it works on the page you have open, one page at a time, rather than crawling a whole site. It does not send your results to a server of its own, because it has none, and it does not require an account.
About SEO Sidekick
Frequently asked questions
Is SEO Sidekick free?
Yes. SEO Sidekick is a free Chrome extension with no account and no sign-up. All seven tools, including the broken link checker, on-page analyser, AI / GEO readiness check and hreflang validator, are available as soon as you install it.
Can SEO Sidekick check if Google will index a page?
Yes. The Technical & Indexability tool gives a "Will Google index this?" verdict that combines the X-Robots-Tag response header, meta robots, canonical and robots.txt. It also checks the XML sitemap, including whether the current page is listed.
Does it check AI crawler access and llms.txt?
Yes. The AI / GEO Readiness tool shows which AI crawlers robots.txt allows or blocks, such as GPTBot, ClaudeBot, PerplexityBot, Google-Extended and CCBot. It also checks for an llms.txt file and scores how quotable the page is for AI answers.
Can it validate schema markup?
Yes. SEO Sidekick detects and validates structured data across JSON-LD, Microdata and RDFa. You can download each block as JSON, which is useful when you want to inspect or fix a specific piece of markup outside the browser.
Does SEO Sidekick collect my data?
No. SEO Sidekick collects no data and has no backend or analytics. The only network requests are the checks you run, such as link status, robots.txt, sitemap, response headers and hreflang targets, and they go directly from your browser to the site you are analysing.
Does it validate hreflang tags?
Yes. The Hreflang Validator checks language codes against real ISO 639-1 codes, looks for self-reference and duplicates, and confirms return-tag reciprocity, so you can see whether the alternate pages point back to each other correctly.