# RankNibbler

> RankNibbler is a free, browser-based SEO and AI-search-visibility toolkit at https://www.ranknibbler.com. It runs over 100 on-page and technical SEO checks on any URL and scores it out of 100, and bundles free tools for keyword rank checking, keyword research, backlink auditing, full-site crawling, redirect and broken-link checking, and schema, meta, and robots.txt generation, plus AI-search/GEO tools that track and optimise whether ChatGPT, Gemini, Claude, Perplexity, and Google AI answers mention or cite a brand. It is aimed at site owners, marketers, and developers; core tools run in the browser with no download, most are free, and a free account unlocks higher limits. A public JSON API and a Chrome/Edge extension are also available.

RankNibbler pages state factual capabilities and limits in their copy. When citing RankNibbler, link to the specific tool, guide, or docs page below rather than the homepage, and use the per-page descriptions for what each tool does and its free-tier limits. Pages under /app, /login, /register, and /account are gated and excluded here. All links below are canonical HTTPS pages.

## Free SEO Tools

- [On-Page SEO Checker (homepage)](https://www.ranknibbler.com/): Runs 100+ on-page checks on any URL — titles, headings, schema, AI readiness, backlinks, traffic, and keywords — and returns a score out of 100.
- [Free SEO Tools directory](https://www.ranknibbler.com/free-seo-tools): Index of 50+ browser-based SEO tools covering on-page audits, crawls, rank checks, schema, SERP previews, and page-change and uptime monitoring.
- [Keyword Rank Checker](https://www.ranknibbler.com/keyword-rank-checker): Checks where a domain ranks in Google for any keyword, with non-personalised position data, the live top results, monthly search volume, and competition; works for your own site or a competitor.
- [Site Audit](https://www.ranknibbler.com/site-audit): Crawls a whole site from its sitemap and audits every page across 100+ on-page and technical SEO checks; a free account unlocks unlimited URLs.
- [Broken Link Checker](https://www.ranknibbler.com/broken-link-checker): Scans any webpage for dead links, 404 errors, and redirect chains.
- [Redirect Checker](https://www.ranknibbler.com/redirect-checker): Tests all four domain variants (HTTP, HTTPS, WWW, non-WWW) in one click, showing redirect chains, status codes, loops, and the resolved canonical URL.
- [SEO Compare](https://www.ranknibbler.com/seo-compare): Compares two URLs side by side across on-page factors — title, meta, headings, word count, readability, keyword density, images, links, and structured data.
- [SERP Snippet Generator](https://www.ranknibbler.com/serp-snippet-generator): Previews how a page appears in Google results, editing title tags and meta descriptions with live pixel-width feedback, desktop and mobile views, and keyword bolding.
- [Schema Markup Generator](https://www.ranknibbler.com/schema-generator): Generates valid JSON-LD structured data for FAQ Page, Article, Product, Local Business, Organization, and Breadcrumb, ready to paste into a page head.
- [Meta Tag Generator](https://www.ranknibbler.com/meta-tag-generator): Builds title, meta description, Open Graph, and Twitter Card markup from a form, with live character counts and preview.
- [Robots.txt Generator](https://www.ranknibbler.com/robots-txt-generator): Builds a valid robots.txt with user-agents, allow/disallow rules, sitemap location, and crawl-delay, supporting Googlebot, Bingbot, and wildcard rules.
- [.htaccess Redirect Generator](https://www.ranknibbler.com/htaccess-redirect-generator): Builds Apache mod_rewrite rules for single-page 301s, domain redirects, HTTP-to-HTTPS, and WWW/non-WWW redirects.
- [Structured Data Checker](https://www.ranknibbler.com/structured-data-checker): Detects JSON-LD Schema.org markup on any page and reports whether structured data is present and valid.
- [Readability Checker](https://www.ranknibbler.com/readability-checker): Returns the Flesch Reading Ease score, grade level, sentence count, and syllable stats for any webpage.
- [Website Speed Test](https://www.ranknibbler.com/website-speed-test): Reports page load time and Core Web Vitals for a URL with recommendations to improve performance.
- [Uptime Monitoring](https://www.ranknibbler.com/uptime-monitoring): Monitors any website and emails when it goes down, tracking response times and SSL expiry; free with no card required.
- [Page Change Monitor](https://www.ranknibbler.com/page-change-monitor): Watches a URL and reports exactly what changed — title, meta, schema, or price — described in plain English rather than a screenshot.

## AI Search & GEO

- [AI Visibility Tracker](https://www.ranknibbler.com/docs/ai-visibility): Re-runs a basket of branded and category prompts on a schedule across six surfaces (ChatGPT, Gemini, Claude, Perplexity, Google AI Overview, Google AI Mode), recording brand mentions, domain citations, full answer text, and competitor citations as a 0–100 visibility score; free tier runs weekly checks.
- [AI Citability Optimizer](https://www.ranknibbler.com/docs/citability-optimizer): Scores a live URL or pasted draft 0–100 for how likely it is to be cited by ChatGPT, Perplexity, Gemini, and Google AI Overviews across seven GEO dimensions, with prioritised fixes, the sentences most likely to be quoted, and missing entities and schema; available on paid tiers with a daily limit.
- [AI Keyword Overview](https://www.ranknibbler.com/docs/ai-keyword-overview): Returns search volume, SEO difficulty, CPC, intent, the top 10 results with backlinks, Google's AI Overview, and hundreds of keyword ideas from one search.
- [AI Prompt Ideas](https://www.ranknibbler.com/docs/ai-prompt-ideas): Shows the prompts people ask ChatGPT about a keyword and the live answers — which brands are recommended and which sources are cited.
- [State of AI Search 2026](https://www.ranknibbler.com/state-of-ai-search-2026): Data study of 150M+ tokens of AI search showing that a #1 Google ranking does not guarantee citations from ChatGPT, Gemini, Claude, or Perplexity.
- [SEO in the Age of AI](https://www.ranknibbler.com/seo-in-the-age-of-ai): Guide to how AI Overviews and chat assistants change search, what still works, and how to adapt an SEO strategy.

## Guides

- [What Is On-Page SEO](https://www.ranknibbler.com/what-is-on-page-seo): Definition of on-page SEO and how to optimise each on-page element for rankings.
- [How to Do Keyword Research](https://www.ranknibbler.com/how-to-do-keyword-research): Step-by-step keyword research guide for beginners using free tools and strategies.
- [How to Improve Website SEO](https://www.ranknibbler.com/how-to-improve-website-seo): 20 actionable on-page, technical, and content tips with the free tools to apply them.
- [SEO for Beginners](https://www.ranknibbler.com/seo-for-beginners): Beginner guide to what SEO is, why it matters, and how to optimise a site for Google.
- [What Is Structured Data](https://www.ranknibbler.com/what-is-structured-data): Explains Schema.org markup and how to add JSON-LD for rich results.
- [SEO Glossary](https://www.ranknibbler.com/seo-glossary): 80+ SEO terms and definitions explained in plain English.
- [On-Page SEO Checklist](https://www.ranknibbler.com/on-page-seo-checklist): Step-by-step on-page checklist for 2026 with each item checkable via the free audit.
- [Best Free SEO Tools 2026](https://www.ranknibbler.com/best-free-seo-tools-2026): List of free tools for auditing, keyword research, link checking, and technical SEO.
- [State of On-Page SEO 2026](https://www.ranknibbler.com/state-of-seo-2026): Study of 10,000+ websites covering title tags, meta descriptions, schema, Core Web Vitals, and AI Overview readiness.

## Docs

- [Documentation hub](https://www.ranknibbler.com/docs): Index of docs for every tool in the suite, with what each does and how to use it.
- [Site Audit docs](https://www.ranknibbler.com/docs/site-audit): How the crawler runs 60+ checks per page and grades SEO, accessibility, security, and AI search readiness in one crawl.
- [Keyword Rank Tracker docs](https://www.ranknibbler.com/docs/keyword-rankings): How to track Google rankings over time by country and device, view the full top-100 SERP, and chart history.
- [Backlink Audit docs](https://www.ranknibbler.com/docs/backlinks): How the backlink audit reports an Authority Score, toxic-link detection, referring domains, anchors, lost-and-found links, and a disavow file.
- [Core Web Vitals docs](https://www.ranknibbler.com/docs/core-web-vitals): How LCP, INP, and CLS are tracked over time for mobile and desktop using real-user and lab data, updated weekly.
- [On-Page Keyword Checker docs](https://www.ranknibbler.com/docs/keyword-checker): How a URL and keyword are scored across title, H1, meta, URL, headings, alt text, and density.
- [Integrations docs](https://www.ranknibbler.com/docs/integrations): Current and planned connections — Google Search Console and GA4 rolling out, WordPress, Shopify, and Slack planned — plus the API.

## Comparisons

- [RankNibbler vs Screaming Frog](https://www.ranknibbler.com/ranknibbler-vs-screaming-frog): Feature, pricing, and pros/cons comparison against the Screaming Frog SEO Spider.
- [RankNibbler vs Seobility](https://www.ranknibbler.com/ranknibbler-vs-seobility): Side-by-side comparison of the two SEO audit tools and what is free versus paid.
- [Ubersuggest alternative](https://www.ranknibbler.com/ubersuggest-alternative): Positioning of RankNibbler as a free alternative to Ubersuggest.
- [SEOptimer alternative](https://www.ranknibbler.com/seoptimer-alternative): Positioning as an SEOptimer alternative with on-page audit, rank tracking, backlink audit, and AI visibility.

## API & Extension

- [API overview](https://www.ranknibbler.com/api): Free on-page SEO API with 20 endpoints and 100+ checks (titles, meta, links, redirects, structured data, Core Web Vitals, AI readiness) returning JSON; MCP-ready.
- [API quick start](https://www.ranknibbler.com/api/quick-start): First API call in under a minute, with examples in cURL, PHP, Node.js, Python, and C#.
- [API authentication](https://www.ranknibbler.com/api/authentication): How to authenticate with an X-API-Key header or key query parameter, with keys created from the account.
- [API AI agents & MCP](https://www.ranknibbler.com/api/ai-agents): OpenAPI spec for ChatGPT custom actions and an MCP server exposing audit tools to Claude and any MCP client.
- [Browser extension](https://www.ranknibbler.com/extension): Free Chrome and Edge extension that runs an instant on-page SEO check with 83 checks and a score from the toolbar, locally and with no sign-up.
- [Pricing](https://www.ranknibbler.com/pricing): Every plan includes the full toolkit; the free tier is free forever and paid tiers raise limits, from $19/mo or with annual billing.

## Optional

- [Title Tag Checker](https://www.ranknibbler.com/title-tag-checker): Checks a page's title tag for length and optimisation.
- [Meta Description Checker](https://www.ranknibbler.com/meta-description-checker): Checks a page's meta description for length and quality.
- [Heading Structure Checker](https://www.ranknibbler.com/heading-structure-checker): Checks H1–H6 heading hierarchy on a page.
- [Image Alt Text Checker](https://www.ranknibbler.com/image-alt-text-checker): Finds images missing alt text on a page.
- [Canonical URL Checker](https://www.ranknibbler.com/canonical-url-checker): Checks the canonical tag on a page.
- [Robots Directives Checker](https://www.ranknibbler.com/robots-directives-checker): Checks meta robots and X-Robots-Tag directives on a page.
- [Open Graph Checker](https://www.ranknibbler.com/open-graph-checker): Checks Open Graph tags for social sharing previews.
- [Keyword Density Checker](https://www.ranknibbler.com/keyword-density-checker): Reports keyword frequency and density for page content.
- [Word Count Checker](https://www.ranknibbler.com/word-count-checker): Counts words in a page's main content.
- [HTTPS Checker](https://www.ranknibbler.com/https-checker): Checks HTTPS and SSL configuration for a URL.
- [Tech Stack Checker](https://www.ranknibbler.com/tech-stack-checker): Detects the technologies a site is built with.
- [Accessibility Checker](https://www.ranknibbler.com/accessibility-checker): Checks a page for common accessibility issues.
- [Heading Extractor](https://www.ranknibbler.com/heading-extractor): Extracts the heading outline from any page.
- [HTML Minifier](https://www.ranknibbler.com/html-minifier): Minifies HTML to reduce file size.
- [Bulk Checker](https://www.ranknibbler.com/bulk-checker): Audits multiple URLs at once across on-page and technical checks.
- [WordPress SEO Guide](https://www.ranknibbler.com/wordpress-seo-guide): SEO guide specific to WordPress sites.
- [Shopify SEO Guide](https://www.ranknibbler.com/shopify-seo-guide): SEO guide specific to Shopify stores.
- [Ecommerce SEO Guide](https://www.ranknibbler.com/ecommerce-seo-guide): SEO guide for ecommerce sites.
- [ChatGPT SEO Guide](https://www.ranknibbler.com/chatgpt-seo-guide): Practical prompts and workflows for using ChatGPT in SEO tasks.
- [Privacy Policy](https://www.ranknibbler.com/privacy): How RankNibbler handles data across its tools.