AlphaSERP Page Analyser

On-page SEO analysis — meta, headings, links, schema, robots, AI crawler rules, llms.txt, GSC integration, Core Web Vitals and more.

AlphaSERP Page Analyser gives you instant, comprehensive SEO analysis of any page you're browsing — built for SEOs, content teams, developers, and UX professionals. Open the extension on any page to get a scored audit out of 100, covering every major on-page signal. Unlike most free SEO extensions, AlphaSERP goes beyond the basics. What makes it different: Google Search Console integration — connect your GSC account and see clicks, impressions, CTR and average position for any page you own, together with the top queries driving traffic to it. No switching tabs, no copy-pasting URLs. Also includes URL Inspection — see index status, last crawl date, Google's chosen canonical, mobile usability and fetch state directly in the extension. Core Web Vitals via PageSpeed Insights — run a live performance analysis on any page with a single click. See your LCP, CLS and INP scores with pass/fail indicators, FCP, TTFB, and the top opportunities to improve performance. Fetches mobile and desktop simultaneously so you can switch between them instantly. Score change detection — the extension tracks your SEO score every time you visit a page and shows you how it has changed since your last visit. Useful for monitoring client sites and tracking improvements over time. AI-era checks — see exactly which AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended and more) are allowed or blocked in robots.txt. Check whether the site has an llms.txt file and preview its contents. Essential for understanding how your content is seen by AI search engines and LLM training pipelines. 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 and page size signals. Full audit covers: • Title, meta description, canonical, lang attribute and viewport • Open Graph (scored 0–4) and Twitter/X card (scored 0–3) • Heading structure with hierarchy validation and H1 order check • Flesch readability score with visual indicator and reading time • Images, word count, internal and external links • Hreflang tags with self-reference and x-default validation • JSON-LD structured data blocks • robots.txt fetched live with rules highlighted for the current page • AI crawler rules — GPTBot, ClaudeBot, PerplexityBot and more • llms.txt check with content preview • Core Web Vitals — LCP, CLS, INP, FCP, TTFB • GSC search analytics — clicks, impressions, CTR, position, top queries • GSC URL Inspection — index status, crawl date, canonical, mobile UX • Third-party script domains with count and warning threshold • Mixed content detection on HTTPS pages • Inline CSS ratio • CTA detection • JavaScript error capture from page load • Score change detection vs last visit • TXT report export for client deliverables 9 analysis tabs: Overview · Meta · Content · Links · Schema · Robots · GSC · Performance · Dev Dark mode included. Persists between sessions. Free. No account required. No data sent anywhere except to Google's own APIs when you connect GSC or run a PageSpeed analysis — using your own credentials and quota.