Free tools · 21 tools · No sign-up
Free AI, SEO & developer tools
Practical free tools for developers, SEO specialists, marketers and website owners. Test your website, improve search visibility, optimize content and prepare your website for both traditional search engines and AI-powered search.
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AI & GEO
How clearly search engines and AI assistants can read, trust and cite a website.
AI Search Readiness Checker
Score how easily AI assistants and search engines can fetch, understand and quote a page: crawlers, content, entities, schema and readability.
Check a page Analysis · AI-assistedAI Content Optimizer
Score structure, readability and AI readability for a page or pasted text, get missing topics and questions, and generate an improved draft.
Optimize content Live check · Generatorllms.txt Generator & Inspector
Check a site’s llms.txt against the proposed format, or generate one from its pages and sitemap. An experimental format, explained honestly.
Inspect or generate Live check · robots.txtAI Crawler Checker
See which search, user-initiated and model-training crawlers your robots.txt allows for a page, and the exact rule that decides.
Check crawlers Live check · StoresAI Commerce Readiness Check
Score a store’s search foundations, AI crawler access, product data, trust signals and performance, with evidence for every finding.
Check a store02
SEO
Page-level search foundations: metadata, structure, structured data and crawling.
SEO Analyzer
Status, redirects, indexability, metadata, headings, links, images, schema and social tags for one page, scored, with a fix for every issue.
Analyze a page Preview · AI-assistedSERP Preview & Meta Generator
Preview a title and meta description on desktop and mobile, check pixel width and keyword use, and get three AI-written alternatives.
Preview a result GeneratorSchema Generator
JSON-LD for Organization, LocalBusiness, Product, Service, Article, Breadcrumbs, WebSite, Person and Event, with autofill and validation.
Generate JSON-LD Live check · AI-assistedRobots.txt & Sitemap Checker
Validate robots.txt, see how Googlebot, GPTBot, ClaudeBot and other crawlers are treated, and check sitemaps for errors, duplicates and redirects.
Check a domain Live check · Product pagesProduct Schema Checker
Check a product page’s price, availability, brand, identifiers, shipping and returns in structured data, with a fix for each gap.
Check a product page03
Developer
Pre-launch checks, stack detection and prompts for coding agents.
Website Launch Checker
An automated pre-launch checklist: HTTPS, redirects, 404s, noindex, staging links, sitemap, metadata, broken assets and security headers.
Run the checklist Live checkTechnology Checker
Detect a site’s CMS or shop platform, frameworks, server, CDN, analytics, consent tool, schema and security headers, with recommendations.
Detect a stack Generator · AI-assistedDeveloper Prompt Generator
Turn a short request into a structured brief for coding agents: requirements, stack conventions, security, testing and acceptance criteria.
Write a prompt Self-checkAI Code Health Check
Built with AI? Score your application’s production readiness across 13 areas and see which risks to fix first.
Score an app04
Network & server
Status codes, headers, certificates, DNS and response times.
HTTP Status & Redirect Checker
Status codes and full redirect chains for up to 10 addresses at once: 301 or 302, loops, 404s, server errors and HTTP to HTTPS.
Check status codes Live checkHTTP Headers Checker
All response headers, with security headers graded and recommended values, plus caching, compression savings and cookie flags.
Check headers Live checkSSL Certificate Checker
Days until expiry, host names covered, chain trust, issuer, TLS version, cipher and key for a website’s certificate.
Check a certificate Live checkDNS Lookup
A, AAAA, CNAME, MX, NS, TXT, CAA and SOA records with TTLs, plus plain-language checks for SPF, DMARC and name servers.
Look up records Live checkResponse Time Checker
Is the site up, and how fast is the server? DNS, connection, TLS, time to first byte and total time across three requests.
Test response time05
AI planning
Estimate and scope AI development and automation work.
AI Development Cost Calculator
Compare your current development cost with cautious and favorable AI-assisted scenarios, with every assumption visible.
Estimate a scenario Pre-assessmentCan AI Automate This?
Describe a repetitive task and see its automation potential, a possible solution and where a person should stay in control.
Assess a taskHow the tools work
Evidence first, then advice
The live checks read public pages, robots.txt, sitemaps, headers, certificates and DNS the way search engines and browsers do, and measure what they find with fixed rules. Every finding shows its evidence and a concrete fix, so you can verify it yourself and hand it to whoever makes the change.
AI is used only where language helps: writing title and description alternatives, suggesting missing topics and questions, drafting improved content, turning findings into an action plan and refining developer prompts. Measurements never come from a model, and AI features run only when you ask for them.
No sign-up, no email
Results appear on the page. There is nothing to register for and no popup asking for your address.
Honest scores
Scores summarize technical checks. They do not claim rankings, traffic, keyword volumes, backlinks or AI citations, which no public page check can know. “Appears technically indexable” is as far as a page check can go; only Search Console confirms indexing.
Safe to run on any site
The checks make ordinary public requests, only when someone starts them, with a cap on requests per check and on checks per site per hour. Private and internal network addresses are refused.
Built by engineers who fix things
The tools come from HUB’s engineering work on WordPress, Magento, custom PHP and JavaScript platforms. Several network tools started life on ToolsPing and were rebuilt here with stricter safety and clearer results.
Your data
What happens to what you enter
Live check results are kept for up to 20 minutes so a repeat check is fast and does not fetch the site again, then deleted. HUB counts how often each tool is used, together with the checked host name for 90 days, without IP addresses, cookies or personal data. Text you paste is not stored.
When you use an AI feature, the text needed for it (for example your title and description, or the content you want improved) is sent to OpenAI’s API with storage turned off. The privacy policy has the details.
More from HUB
Try the Agentic Commerce Lab to watch a shopping agent work through a store catalog, or read the AI Engineering Journal for guides on AI search, Magento and AI-assisted development.
Questions
About the
free tools
Found something you want fixed? HUB can take the report and implement the changes.
Are the tools really free?
Yes. There are fair-use limits per visitor and per hour so the tools stay available for everyone, and AI features share a daily budget that resets at 00:00 UTC.
Which tool should I start with?
For a live website, start with the SEO Analyzer or AI Search Readiness Checker on your most important page. Before a launch or migration, run the Website Launch Checker. For content, use the AI Content Optimizer.
Can I check a competitor’s website?
Yes. The tools read only public information, the same way a browser or search engine does.
Why can a check fail?
The site may block automated requests, time out, require a login, or have a certificate problem. The error message explains which. Private and local network addresses are never checked, for security.
Do the tools work on mobile?
Yes. Every tool works on phones and tablets; long tables scroll sideways.
Want HUB to fix
what you found?
From a single launch checklist to a full technical SEO, performance or AI-readiness project, with engineers who implement the changes.