RankNibbler documentation

Welcome to the RankNibbler documentation — the guide to every tool in your account. Each page explains what a tool does, how it works and how to use it to improve your SEO. Every tool below is included free with a RankNibbler account, so you can follow along as you read.

RankNibbler is one SEO suite, not a scatter of separate tools. Add your site once as a project and the project tools keep working in the background — tracking rankings, Core Web Vitals and more — while the rest run on demand against any URL. These docs cover all of it, organised the same way as the app.

Projects

Add your site as a project and these run continuously, building history over time.

• Rank Tracker — a free keyword rank tracker: monitor your Google positions over time by country and device, with the full top-100 SERP per keyword.
• AI Visibility — track when ChatGPT, Gemini, Claude, Perplexity and Google's AI answers mention or cite your brand, with a visibility score over time.
• Core Web Vitals — track LCP, INP and CLS for mobile and desktop over time, auto-populated for every project from day one.
• Top Pages — your best-performing pages by organic visibility, built from the keywords you track.
• Competitors — compare your organic visibility and share of voice with rivals for the keywords you track, and see who outranks you.
• Backlink Audit — your Authority Score with history, toxic link detection, new and lost links daily, and a ready-to-upload disavow file.
• Reviews — automatic reputation monitoring: your Trustpilot rating, review count and latest reviews, trended weekly.

Keyword tools

Research keywords across Google and AI search — what people search, what they ask assistants, and who gets recommended.

• AI Keyword Overview — volume, difficulty, CPC, intent, the top 10 with backlinks, Google's AI Overview and hundreds of keyword ideas from one search.
• AI Prompt Ideas — the prompts people ask AI assistants about a keyword, with the live answers, brands recommended and sources cited.
• Keyword Checker — a free on-page keyword checker: score how well a page is optimised for a keyword across title, H1, meta, URL, headings and alt text.
• TF*IDF Tool — a free TF-IDF tool: see the terms top-ranking pages use for a keyword and what your content is missing.

Scans & monitoring

Run an on-demand check against any URL, or let RankNibbler watch your site and alert you when something changes.

• Site Audit — a free SEO audit tool: crawl your whole site, fix 60+ issue types, and grade SEO, accessibility, security and AI search readiness in one pass.
• Uptime Monitoring — free website uptime monitoring built for SEO, with checks that confirm a real outage before they alert you.
• Change Monitor — free SEO change monitoring: get alerted when a page goes noindex, or its title, canonical, content, schema or price changes.

Tools

Quick, focused tools for a specific job — most work on any URL with no setup, and your results are saved to your account.

• SERP Snippet Generator — a free SERP simulator: preview your Google snippet on desktop and mobile and optimise your title and meta description by pixel width.
• Campaign URL Builder — a free UTM builder for GA4: tag campaign links with utm_source, utm_medium and utm_campaign and copy a clean tracking URL.
• Redirect Auditor — a free redirect checker: test all four domain variants, follow every chain hop by hop and get ready-made 301 rules for Apache, NGINX and Caddy.
• Comparisons — compare your page against a competitor's, audited by the same engine, across 18 on-page metrics with a keyword gap and an AI plan to close it.

Developer

Build RankNibbler's on-page SEO checks straight into your own stack.

• Integrations — connect RankNibbler to your stack: Google Search Console and GA4 rolling out now, more planned, and a full API today.
• API reference — the free on-page SEO API: 20 endpoints, JSON, OpenAPI 3 and an MCP server for AI agents.

Frequently asked questions

Do I need a RankNibbler account to use these tools?

These docs are written for RankNibbler accounts, and a free account unlocks the full suite — projects, saved history, rank tracking, Core Web Vitals and the rest. A few tools can be tried without signing in, but creating a free account is the quickest way to follow along with every guide here.

Is RankNibbler free?

Yes. Every tool documented here is free with a RankNibbler account. Some tools have usage limits on the free tier; if you need higher limits, you can get in touch to raise them.

What's included in RankNibbler?

One SEO suite: project tools that track a site over time (rank tracking, AI visibility, Core Web Vitals, top pages, competitors and reviews), keyword research across Google and AI (AI Keyword Overview, AI Prompt Ideas, keyword checker, TF-IDF), on-demand and ongoing scans (site audit, uptime and change monitoring), focused utilities (SERP snippet generator, UTM builder, redirect auditor and page comparisons), and a developer API with integrations on the way.

How do I get started with RankNibbler?

Create a free account, add your site as a project, and run your first site audit. From there, each guide in these docs walks you through a specific tool — what it does, how it works and how to use it.

Are these docs for the free or paid version?

Both. The tools work the same way whichever tier you're on; the guides describe the features, and any limits that differ by tier are noted where they apply.

Get started free

Every tool in these docs is included with a free RankNibbler account — create one and follow along.

Create a free account   or sign in

We add new guides as new tools ship — check back as the suite grows.