Observed Signal · Jul 2, 2026 · Product Launch · Source: DEV Community · Impact: 1/5 · Sentiment: Positive
Developer Releases Free Open-Source Browser SEO Checker
Adil Makhdoom published a free, open-source SEO checker that runs entirely in the browser and performs 20+ audits across technical SEO, on-page SEO, social/schema, and performance. The tool is distributed as three static files (index.html, style.css, script.js), requires no signup or API keys, and uses the allorigins.win CORS proxy to fetch page HTML client-side. Performance metrics (PageSpeed mobile score, LCP, CLS, TBT) are pulled from Google’s PageSpeed Insights API v5. Results show pass/warning/fail status, the measured value, and a short remediation tip; audits can be exported to CSV. The project is published with a live demo and a GitHub repository, and the author invites contributions and pull requests.
A useful open-source client-side SEO auditing tool benefits web designers and SEOs but is a small, incremental technical release rather than an industry-shifting development.
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Key Takeaways & Evidence Grounding
- Tool built and published by Adil Makhdoom (Showit website designer and SEO specialist).
- The SEO checker is fully open-source and hosted with a live demo and a GitHub repository.
- Runs client-side as three static files (index.html, style.css, script.js) and uses the allorigins.win CORS proxy to fetch rendered HTML without a backend.
- Performs 20+ checks across four categories: Technical SEO, On-Page SEO, Social & Schema, and Performance (via Google PageSpeed Insights API v5).
- Each check returns pass/warning/fail, the found value, and a one-line fix tip; audit results can be exported to CSV.
Connected Companies & Entities
1 Entity mapped“The PageSpeed Insights API v5 is free and doesn't require an API key for basic usage. I call it with `?strategy=mobile` and pull the LCP, CL...”
Ontology Mapping & Concepts
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Free SEO + AI-Search (GEO) Audit Tool Released
Developer Ravi Gupta published a free, open-source SEO and AI-search (GEO) audit tool at freeseoaudit.vercel.app. The tool runs without signup or crawl limits and streams reports across 40+ checks in eight categories, including metadata, JSON-LD structured data, crawl & indexing, Core Web Vitals, security headers, and GEO/AEO-specific checks. GEO checks validate llms.txt, detect accidental blocking of AI crawlers (e.g., GPTBot, ClaudeBot, PerplexityBot), evaluate paragraph self-containment (the "Island Test"), and surface direct-answer and E-E-A-T signals. The app uses Next.js 15 and React 19 on Vercel, with a Node/Express TypeScript backend on Render and optional Playwright rendering; code is available on GitHub.
Open-source Claude Code SEO auditor with Google/Bing scores
An individual developer, Eduardo Monteiro, open-sourced "SEO Rank Audit": a Claude Code skill that audits websites and produces 0–100 scores per SEO criterion separately for Google and Bing. The tool collects site structure, fetches real Core Web Vitals via the public PageSpeed Insights API, and can optionally pull Bing Webmaster Tools data with the user's API key. The project is published on GitHub under the MIT license and installs as a Claude Code CLI plugin. The author emphasizes verifiable measurements only (marking unverifiable items as "unverified") and welcomes feedback and PRs on scoring weights.
Free SEO + GEO AI Audit Tool Launched
Ravi Gupta published a free, open-source SEO and AI-search (GEO) audit tool (freeseoaudit.vercel.app) on June 15, 2026. The web tool requires no signup and places no crawl limits, streaming results for 40+ checks across eight categories including metadata, JSON‑LD structured data validation, crawl & indexing, Core Web Vitals, security headers, and a dedicated GEO/AEO section that targets AI citation readiness. GEO checks include llms.txt detection/spec conformance, robots.txt rules that may block AI crawlers (e.g., GPTBot, ClaudeBot, PerplexityBot), an "Island Test" for extractable paragraphs, direct-answer detection, and E‑E‑A‑T signals. The stack uses Next.js 15 and React 19 on Vercel with a Node/Express/TypeScript backend on Render, optional Playwright rendering, SSE streaming, and the source code is available on GitHub.
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