AlphaSERP Page Analyser — Free SEO Chrome Extension

A free Chrome extension that gives you instant, comprehensive SEO analysis of any page you are browsing. Open it on any page to get a scored audit out of 100, Google Search Console data, live Core Web Vitals, AI crawler checks, and a full technical breakdown — all in one popup, without switching tabs.

Built for SEOs, content teams, developers, and anyone who needs fast on-page analysis as part of their daily workflow. No account required for the core audit. No data sent to AlphaSERP servers.

[SCREENSHOT — Overview tab showing a real page score]

[SCREENSHOT — GSC tab showing clicks, impressions, position data]

[SCREENSHOT — dark mode, any tab]

What makes it different from other free SEO extensions

Most free SEO extensions cover title tags and meta descriptions. AlphaSERP goes further in several areas that matter to working SEOs.

Google Search Console integration

Connect your GSC account once and see clicks, impressions, CTR, and average position for any page you own — right in the extension without leaving the page. The GSC tab also shows the top queries driving traffic to the URL and includes URL Inspection: index status, last crawl date, Google’s chosen canonical, mobile usability, and fetch state. No tab switching, no copy-pasting URLs into Search Console.

Core Web Vitals via PageSpeed Insights

Run a live performance analysis on any page with one click. LCP, CLS, and INP scores with pass/fail indicators alongside FCP, TTFB, and the top improvement opportunities from Lighthouse. Mobile and desktop are fetched simultaneously and cached — switch between them instantly without a second API call.

AI crawler rules and llms.txt

See exactly which AI crawlers are allowed or blocked in the site’s robots.txt — GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and others. The extension also checks whether the site publishes an llms.txt file and shows a preview of its contents. Useful for understanding how a site’s content is positioned for AI search engines and LLM training pipelines.

Score change detection

The extension tracks your SEO score every time you visit a page and shows how it has changed since your last visit. Useful for monitoring client sites, tracking the impact of on-page changes, and catching regressions without needing to remember previous scores.

JavaScript error detection

Errors are captured from the very start of page load and displayed in the Dev tab alongside third-party script counts, inline CSS ratio, mixed content warnings, and page size signals.

Anchor text audit

Internal links are listed with their anchor text and generic anchors — click here, read more, learn more — are flagged individually. This level of anchor text analysis is available in paid tools like Screaming Frog and Ahrefs but absent from most free extensions.

Full audit coverage across 9 tabs

Overview

Score out of 100 with issues listed in order of impact and checks passed. Quick stats: word count, image count, internal link count, schema blocks. Score change vs last visit. Hreflang summary at the bottom — full table if tags are found, single-line note if not.

Meta

Title tag and length, meta description and length, robots meta, canonical, lang attribute, viewport, Open Graph (scored 0–4), Twitter/X card (scored 0–3).

Content

Full heading hierarchy as a visual tree with order validation — flags if H1 appears after H2 or if levels are skipped. Flesch readability score with visual indicator. Word count, reading time, page size, top keywords by frequency.

Links

All internal and external links with anchor text. Generic anchor text flagged individually.

Schema

All JSON-LD structured data blocks parsed and displayed with type and properties present. Link to Google’s Rich Results Test for full validation.

Robots

Live robots.txt fetched and displayed. Rules affecting the current page highlighted. AI crawler rules shown with allow/block status. llms.txt check with content preview.

GSC

Clicks, impressions, CTR, and average position. Top queries. URL Inspection: index status, last crawl date, canonical, mobile usability, fetch state. Connect your GSC account with just one click right there in the extension window to get your performance data without having to switch to Search Console.

Performance

Run PageSpeed analysis on demand. Performance score out of 100. LCP, CLS, INP, FCP, TTFB. Mobile and desktop cached for instant switching. Top 3 Lighthouse improvement opportunities.

Dev

JavaScript errors captured from page load start. Third-party script domains with count and warning threshold. Inline CSS ratio. Mixed content detection. CTA detection. Page size. TXT report export for client deliverables.

How to install

One click from the Chrome Web Store.

The extension works on any standard http or https page. It will not run on browser settings pages, the new tab page, or PDFs. Dark mode is included and persists between sessions.

Privacy and permissions

The extension requests three permissions: activeTab (to read the current page when you click the icon), scripting (to inject the analysis script), and storage (to save your score history for change detection). None of these enable background access or tracking.

No data is collected or sent to AlphaSERP servers. When you connect GSC or run a PageSpeed analysis, requests go directly to Google’s own APIs using your credentials and your quota.

Also available as a web tool

Prefer not to install an extension? The page SEO analyser web tool runs the same core analysis for any URL you paste in. The extension reads the fully rendered DOM making it more accurate for JavaScript-rendered sites. But for most standard sites the two produce identical results.

Other free SEO tools from AlphaSERP

• Technical SEO priority scorer
• Keyword cannibalisation checker
• Internal link opportunity finder
• Page SEO analyser — web tool

See all free SEO tools from AlphaSERP.