A page can rank on page one of Google and still be invisible to ChatGPT. AI search engines like Perplexity, Claude, and Google's own AI Overviews decide what to cite using signals most classic SEO tools were never built to check — structured data, answer-style formatting, whether an AI crawler can even reach the page through robots.txt. Checking those signals by hand means digging through page source and robots.txt line by line, and most SEO extensions still don't check for them at all.
A newer category of Chrome extension has grown to close exactly that gap — install one, run it from the toolbar on any page, and get a score for how ready that page is to be found and cited by AI search, not just ranked by Google. Several of these AI-visibility checkers are now on the Chrome Web Store. This comparison looks at 4 of the more established ones — SAGE, CMO Works, SEOLensAI, and Zicy — on what each checks, how deep it goes, and what it costs to use.
In short
SAGE, CMO Works, SEOLensAI, and Zicy are 4 Chrome extensions that score AI visibility and SEO. SAGE runs 200+ checks across 15 categories, with a one-time 25-scan trial before a paid license. CMO Works is the only one of the 4 that scores trust and conversion signals alongside SEO and AI visibility, with 70+ checks and a written analysis, free up to 5 audits a month. SEOLensAI has no monthly cap on scans and includes dedicated AI-citation-readiness scoring. Zicy checks 40+ AI bots and 15+ schema types, with support for 12 languages.
What "AI Visibility" Checking Adds to Traditional SEO
Classic SEO checkers score the signals that drive traditional rankings: title tags, header structure, image alt text, internal linking, page speed. Those signals still matter, but they say little about whether ChatGPT, Perplexity, or Google's AI Overviews will cite the page.
AI visibility checking — generative engine optimization (GEO) and answer engine optimization (AEO) — scores a different, overlapping set of signals: schema.org structured data, FAQ and answer-style content structure, author attribution, publish dates, cited statistics, and whether AI crawlers like GPTBot, ClaudeBot, and PerplexityBot can even reach the page through robots.txt. See how GEO, AEO and SEO actually differ for the full breakdown — every extension below checks pieces of all 3, at varying depth. Auditing a single page is a different job from ongoing brand-citation tracking across ChatGPT, Claude and AI Overviews, covered separately in how to track your brand's share of voice across those platforms.
None of the 4 extensions treats AI-visibility checking as a separate add-on scan. Each folds it into the same pass as traditional SEO. How much depth that half of the scan gets is where the 4 tools diverge.
The 4 Extensions, Compared
Free-tier limits and check depth, pulled from each extension's Chrome Web Store listing and public product page:
| Extension | Rating | Free Tier | Core Checks | Time to Analyze |
|---|---|---|---|---|
| SAGE - AI SEO, AEO & GEO Engine | 4.7/5 | 25 full scans, then a paid license key | 200+ checks across 15 categories | Not stated |
| CMO Works Free AI Visibility & SEO Analyser | 5.0/5 | 5 full audits/month, no card required | 70+ checks across 5 weighted dimensions (SEO, AI Visibility, Trust, Conversion, Tech), with a written strategic analysis | Under 20 seconds |
| SEOLensAI — SEO, AEO & GEO Checker | 5.0/5 | 100% free, unlimited scans | 30+ checks incl. AI citation-readiness | Not stated |
| Zicy – AEO/GEO Audit & AI Consultant | 4.5/5 | Free to install (scan limits not published) | AI-readiness scoring across 40+ AI bot signals and 15+ schema types | Not stated |
1. SAGE - AI SEO, AEO & GEO Engine (4.7/5)
Strengths: a Featured badge on the Chrome Web Store, plus the deepest single scan of the group — 200+ checks across 15 categories.
Trade-offs: the free tier is a one-time trial — 25 scans total, then a paid license key is required to keep using it. There's no dedicated Trust or Conversion scoring — SAGE stays inside SEO and AI-visibility territory.
Best for: teams that want the single deepest audit available and are comfortable paying once the trial scans run out.
2. CMO Works Free AI Visibility & SEO Analyser (5.0/5)
Strengths: the only one of the 4 that scores Trust and Conversion alongside SEO, AI Visibility (GEO/AEO) and Tech — 70+ checks across those 5 weighted dimensions, with a written strategic analysis in plain language and audit history saved automatically to track score changes over time. Built by a working marketing consultancy that uses the same scoring for client work.
Trade-offs: the free tier caps at 5 full audits a month, and the added analysis step takes closer to 20 seconds per scan, versus a couple of seconds for the 3 browser-only tools.
Best for: teams that want SEO, AI visibility, trust, and conversion checked together in one audit, with a prioritized plan attached to the results.
3. SEOLensAI — SEO, AEO & GEO Checker (5.0/5)
Strengths: no scan cap and no license key, ever. It also runs AI Citation Readiness scoring: checking whether GPTBot, ClaudeBot, Google-Extended, CCBot, and PerplexityBot can reach the page via robots.txt, alongside structured-data and quotable-content checks.
Trade-offs: its 30+ checks cover less ground than SAGE's 200+, and there's no Trust or Conversion dimension either.
Best for: unlimited AI-citation checks specifically, at no cost.
4. Zicy – AEO/GEO Audit & AI Consultant (4.5/5)
Strengths: built specifically around AI-answer-engine readiness — checks over 40 AI bots (GPTBot, ClaudeBot, PerplexityBot and others) via robots.txt, meta directives, and X-Robots-Tag headers, plus a schema tool covering 15+ types with JSON-LD/Microdata/RDFa detection. Available in 12 languages.
Trade-offs: no dedicated Trust or Conversion scoring, and exact free-tier scan limits aren't published on the listing.
Best for: teams that want deep AI-crawler and schema auditing, especially for non-English sites.
Frequently Asked Questions
What is an AI visibility checker Chrome extension?
A browser extension that scores a webpage on the signals that determine whether AI search engines like ChatGPT, Perplexity, and Google AI Overviews are likely to cite it — structured data, answer-style content, author attribution, and whether AI crawlers can access the page at all.
What's the difference between an SEO checker and an AI visibility checker?
A traditional SEO checker scores the signals that drive search-engine rankings — titles, headers, page speed, backlinks. An AI visibility checker scores a related but distinct set of signals — schema markup, answer-style structure, citation-readiness — that determine whether AI search engines cite the page — a different question from whether it ranks.
Is there a genuinely free Chrome extension for AI visibility and SEO?
SEOLensAI, CMO Works, and Zicy all have no paid tier at all. SEOLensAI offers unlimited scans, CMO Works gives 5 full audits a month with no credit card required, and Zicy is free to install with its scan limits not published. SAGE is the only one of the 4 with a paid tier, after a one-time 25-scan trial.
How many checks do these extensions actually run?
SAGE runs the most at 200+ checks across 15 categories. CMO Works runs 70+ checks across all 5 of its scored dimensions — SEO, AI Visibility, Tech, Trust and Conversion — the only one of the 4 that measures Trust and Conversion at all, with a written strategic analysis alongside the rule-by-rule results. SEOLensAI has 30+ checks including AI citation-readiness, and Zicy focuses on 40+ AI-bot and schema-specific signals.
Which extension is best for checking AI citation-readiness specifically?
SEOLensAI and Zicy both offer dedicated AI Citation Readiness scoring — SEOLensAI checks whether GPTBot, ClaudeBot, Google-Extended, and PerplexityBot can access the page via robots.txt, while Zicy checks over 40 AI bots via robots.txt, meta directives, and X-Robots-Tag headers. CMO Works folds the same category of signal into its broader AI Visibility dimension alongside SEO, Trust and Conversion.
Can I use these extensions to check a competitor's website?
Yes — all 4 extensions analyze any public webpage, including pages you don't own, which makes them useful for competitive benchmarking as well as auditing your own site.
About the Author
Ruslan Abdrakhmanov is an Executive Marketing Advisor and CMO with 13+ years leading international marketing teams across EMEA, SEA, and Americas. Expert in data-driven growth strategies with the track record growing B2B and B2C businesses.
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