Check your website’s SEO and track its rankings — free
The most in-depth free on-page SEO check there is — 100+ checks on any URL in seconds. Then create a free account to track your Google rankings and audit your whole site.
Credentials set
Free SEO score in seconds. Create a free account → to track rankings and audit your whole site.
Free SEO tools
Crawl a whole site, find broken links, check rankings, generate schema and preview your search snippet.
Explore tools
Developer API
Forty endpoints, an OpenAPI 3 spec and an MCP server, so your scripts and AI agents can run the same audits.
Explore the APIThe All-in-One SEO Monitoring Platform for Growing Websites
Track keyword rankings, run automated SEO audits, monitor website uptime, and detect page changes from a single dashboard. RankNibbler continuously watches your website so you can find issues before they hurt your Google rankings.
Site Scans
Crawl and audit your whole site automatically, with full saved history.
Scheduled scans
Re-crawl and audit your sites automatically on a recurring schedule.
Uptime monitoring
Round-the-clock checks with response-time and SSL alerts when a site goes down.
Change Monitor
Watch any page; AI emails you the exact diff the moment something important changes.
Core Web Vitals
Track LCP, INP and CLS for mobile and desktop over time, populated from day one.
Redirect Auditor
Map redirect chains and catch loops, 404s and SEO leaks.
Keyword Rankings
Track your Google positions over time by device and location.
Top Pages
See which of your pages rank best across every keyword you track.
Organic Visibility
Track your overall share of Google search visibility across every keyword you target.
Competitors
Track rival domains and how you stack up on the same keywords.
Competitor Traffic
See rivals' estimated organic traffic, its £ value, ad spend and keyword momentum over time.
Comparisons
Side-by-side SEO audits of your site against competitors, saved to revisit.
Backlinks
Audit your backlink profile and track new, lost and toxic links over time.
Keyword Checker
Check your rank, SERP snippet and on-page signals for any keyword.
Keyword Gap
Find the high-volume keywords your competitors rank for that you're missing.
Content Builder
Write and optimise content with live keyword targeting and on-page scoring as you type.
TF*IDF Tool
Optimise content against the top-ranking pages for your target term.
SERP Snippet Generator
Preview and optimise your Google title and meta snippet by pixel width.
Campaign URL Builder
Build clean UTM tracking links for GA4 campaigns in seconds.
AI Visibility
See where your site shows up across ChatGPT, Gemini, Claude, Perplexity and Google AI.
AI Keyword Overview
Research any keyword across Google and AI answers — volume, difficulty, intent and trends.
AI Prompt Ideas
See the real questions people ask ChatGPT, Gemini and Perplexity about your topics.
Projects & team
Organise sites into projects and invite your team with role-based access.
Full REST API
Every tool as a JSON API for your scripts, dashboards and AI agents.
Professional SEO analysis, without the enterprise price tag
RankNibbler gives site owners, agencies and developers the same depth of technical SEO analysis that enterprise platforms provide, in a toolkit that is free to start and priced on usage rather than seats.
Our vision
Every organisation should be able to see its site exactly as a search engine and an AI assistant see it. Analysis of that depth has historically required an enterprise budget and a sales process. We treat that as a tooling constraint rather than an economic one, and we are building the platform that removes it.
Our mission
To make rigorous SEO analysis available to everyone who needs it. Every tool runs free on a single page, the entire platform is exposed through a documented API, and paid plans exist to fund scale rather than to gate capability. No feature is withheld from the free tier.
What people make of it
Reviews from the people using RankNibbler, published unedited and the moment they are submitted.
195 reviews · 80% rated 4 or 5
Rank tracking by country and device is accurate. Very useful for local SEO work.
Jan PawlowskiVerified RankNibbler accountFree on-page audit with 100+ checks is amazing. Fixed my title tags and rankings improved in a couple of weeks.
Aiza RehmanVerified RankNibbler accountAverage but functional.
Henry WrightVerified RankNibbler accountsite seems to be slow for me :(
great thanks!
the free audits were really quick and useful, however it would be nice to see the pdf formatting be more professional looking!
Really quick to use, and set up, now part of my everyday SEO toolkit
Rank tracking works great.
Ankit JoshiVerified RankNibbler accountClean and effective.
Daniyal JavedVerified RankNibbler accountwas ok!
Oscar LewisVerified RankNibbler accountVery good. Would love a bit more historical ranking data on the free plan.
Mussa ButtVerified RankNibbler accountSwitched most of my monitoring from a more expensive suite. Rank tracking, basic keyword research and the site audit cover 80% of what I need. The AI prompt ideas are surprisingly good for content briefs.
Katharina MeyerVerified RankNibbler accountSite crawl plus broken link detection caught problems before a client launch.
Atharv RaoVerified RankNibbler accountDoes the job for starters.
Niamh Dalysoome of the features feel rushed, good overall but take your time guys!
Madison LewisVerified RankNibbler accountDoes the Job i guess
Sana ButtVerified RankNibbler accountGood tool, i feel like the app layout isn't the best
Diya BansalVerified RankNibbler accountExpected more. The free plan feels incomplete for an SEO tool that markets itself as full-featured.
Noah SchröderVerified RankNibbler accountNice free suite. The paid plans unlock the real power if you need higher limits.
Isla KingVerified RankNibbler accountGreat tool for analysing website's SEO started using for my new blog site
Omar ShahSite audit crawls well and the recommendations are practical. Saved me hours of manual checking.
Meera ReddyVerified RankNibbler accountNot enough for serious work on free.
Charlie RobinsonVerified RankNibbler accountThe PDF reports look professional enough for client presentations.
Leo ThompsonVerified RankNibbler accountAudit is okay but I expected more from the rank tracker on the free tier.
Aiden LewisPerfect for quick SEO checks.
Ali RizviVerified RankNibbler accountFrequently asked questions
Is RankNibbler free to use?
Yes. The whole suite is free with a free account — site audits, rank tracking, AI visibility, keyword research, backlinks, uptime monitoring and more. A few data-heavy tools have fair daily limits, and you can get in touch to raise them.
What's included with a free account?
Projects that track your site over time (keyword rankings, AI visibility, Core Web Vitals, top pages, competitors and reviews), full-site audits, keyword research across Google and AI, a backlink audit, uptime and change monitoring, focused tools like the SERP snippet generator — and a developer API.
How do I check my website's SEO?
Enter your URL at the top of this page and click Analyse. RankNibbler will fetch your page and run over 100 checks covering meta tags, headings, images, links, structured data, readability, keyword density, tech stack, accessibility, and more. You will receive a score out of 100 with clear recommendations for every issue found.
What does RankNibbler check?
over 100 on-page SEO factors per page — title tags, meta descriptions, heading structure, image alt text, links, structured data, Open Graph tags, canonical URLs, robots directives, readability, tech stack and accessibility — and the site audit crawls your whole site to catch these issues on every page at once.
What is a good SEO score?
A score of 80 or above is considered good and means the page follows most SEO best practices. A score of 50–79 means there are several issues worth fixing. Below 50 indicates significant problems that are likely hurting your search rankings. See the full score breakdown for details on how each check contributes to the total.
Why is my score low even though my site looks fine?
A visually polished website can still have poor on-page SEO. Common hidden issues include missing meta descriptions, duplicate title tags, missing alt text on images, no structured data, and render-blocking scripts. These are invisible to visitors but affect how search engines understand and rank your pages.
Does RankNibbler track keyword rankings?
Yes — add your site as a project and the rank tracker checks your Google positions by country and device, capturing the full top 100 for every keyword so you can see exactly who sits above you and how positions move over time.
Can RankNibbler track my brand in ChatGPT and AI search?
Yes — AI Visibility tracks when ChatGPT, Gemini, Claude, Perplexity and Google's AI answers mention your brand or cite your site, scored over time. The AI keyword tools also show which brands assistants recommend for any keyword.
Can RankNibbler audit my whole site?
Yes — enter your domain and RankNibbler's robust crawler discovers every page and can crawl enterprise-grade sites in minutes, grading each page with the site audit so you can find your weakest URLs fast.
Can RankNibbler check pages behind a login?
Use the HTTP Basic or Storefront Password fields for staging sites and password-protected Shopify stores. For pages behind a full user login, RankNibbler can only analyse publicly accessible pages — it fetches pages the same way a search engine bot would.
Does RankNibbler have an API?
Yes — a free developer API with 40 endpoints, an OpenAPI 3 spec and an MCP server so AI agents can use it as a tool. Integrations with Google Search Console and GA4 are rolling out, with more planned.
Do I need a credit card to sign up?
No. Create a free account with just your email — no card, no trial countdown. If you ever outgrow a free limit, you get in touch and we raise it.
