Web apps, each built from one idea

Enter a URL and get a six-axis, 100-point diagnosis of how citable your site is for AI search.

Only the URL you enter is sent. We never re-serve the fetched page and store nothing (it is gone when the request ends).

Enter a URL to grade its title, meta description, canonical, robots, h1, OGP, lang and viewport. Character counts and robots.txt crawlability are checked too.

Only the URL you enter is sent. We never re-serve the fetched page and store nothing (it is gone when the request ends).

Enter a URL to grade CSP, HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and Permissions-Policy out of 100, with an A–F verdict, plain-language explanations and recommended values.

Only the URL you enter is sent. We return the grade and the graded header values only — never the page body — and store nothing (it is gone when the request ends).

Enter a hostname and we run a real TLS handshake to read the certificate being served: expiry, days remaining, issuer, SAN and the intermediate chain, with a warning under 30 days.

Only the hostname you enter is sent (as TLS SNI). We return the fields read from the certificate and store nothing (it is gone when the request ends).

Enter a URL and we follow 301, 302, 307, 308 and meta refresh redirects one hop at a time, listing the status, URL and timing of each step, the final destination, and an SEO warning at three or more hops.

Only the URL you enter is sent. We return the status, URL and timing of each hop — never the fetched page — and store nothing (it is gone when the request ends).

Paste up to 20 URLs and get the HTTP status, response time and final URL after redirects for each one — for post-relaunch smoke checks and link-list clean-ups. One-off checks only; no scheduled monitoring.

Only the list of URLs you paste is sent. We return the status, response time and final URL only — the page body is never read — and store nothing (it is gone when the request ends).

Paste the old→new URL map from a relaunch or domain move (up to 20 pairs). We follow each old URL and check it lands exactly on the new URL you expected, flagging temporary 302s, chains, loops, missing redirects and 404s row by row, with a CSV to copy.

Only your map (old and new URLs) is sent. We follow the old URLs and return statuses and URLs only — the page body is never read — and store nothing (it is gone when the request ends).

Enter a URL to extract its links (a href), fetch up to 40 of them and surface the broken ones, plus a list of images with missing or unhelpful alt text. Only the page you enter is examined — never a whole-site crawl.

Only the URL you enter is sent. We return the extracted link URLs with their status and the alt verdicts — never the fetched HTML — and store nothing (it is gone when the request ends).

Enter a URL to inspect its og: / twitter: tags and preview the X and Facebook cards. The og:image is fetched and measured, not just read from the markup.

Only the URL you enter is sent. We never re-serve the fetched HTML or image and store nothing (it is gone when the request ends).

Enter a URL to see every h1–h6 as an indented outline in document order. Multiple h1s, skipped levels and empty headings are flagged, and the outline copies out as Markdown.

Only the URL you enter is sent. We never re-serve the fetched page and store nothing (it is gone when the request ends).

Enter a URL to extract every JSON-LD block and pretty-print it by @type. Syntax errors are pinpointed with line and column, and required/recommended properties are listed for Article, FAQPage, BreadcrumbList, LocalBusiness and Organization.

Only the URL you enter is sent. We return the extracted JSON-LD re-assembled for display plus our findings — never the fetched HTML — and store nothing (it is gone when the request ends).

Enter a URL to fetch its robots.txt and see, bot by bot, whether GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot, Bytespider and others may crawl it — including the Disallow that matched, llms.txt presence and X-Robots-Tag.

Only the URL you enter is sent. We return verdicts and file presence only — never the fetched robots.txt or HTML — and store nothing (it is gone when the request ends).

Enter a URL and a user-agent to fetch the site's robots.txt and rule on whether that URL may be crawled, following Google's matching rules (longest match wins, ties go to Allow). The winning rule and the rules it beat are shown with line numbers, plus syntax warnings.

Only the URL and user-agent you enter are sent. We fetch just that site's /robots.txt, never re-serve it, and store nothing (it is gone when the request ends).

Enter a sitemap URL to fetch it, validate the XML, and see the URL count, the spread of lastmod dates and what a sitemap index points at (one level deep). Raw `&` and unclosed tags are reported with line numbers; robots.txt discovery and gzipped sitemaps are supported.

Only the URL you enter is sent. We never re-serve the fetched XML — only counts, the lastmod spread, warnings and the first 200 extracted URLs — and store nothing (it is gone when the request ends).

Enter a URL to extract its hreflang annotations (link rel=alternate and the HTTP Link header) and verify the return links by actually fetching each declared page. Self-reference, x-default and invalid language/region codes such as en-UK or jp are checked too.

Only the URL you enter is sent. We also fetch the declared pages, but never re-serve them — only the hreflang values, URLs and verdicts — and store nothing (it is gone when the request ends).

Enter a URL to list every http:// reference left inside an https page (img, script, link, iframe, video, source and CSS url()), with its line number, the offending tag and how to fix it. References browsers block are separated from the ones they auto-upgrade.

Only the URL you enter is sent. We fetch that single page and never request the http:// URLs found inside it. The page itself is never re-served and nothing is stored (it is gone when the request ends).

Enter a URL to audit every img / picture on the page: format (WebP / AVIF adoption), loading=lazy, width/height attributes and alt text. For the first 30 images the real file size and served format are measured with a HEAD request.

Only the URL you enter is sent. Neither the page nor the images are re-served and nothing is stored (it is gone when the request ends).

Enter a URL to infer the CMS (WordPress, Shopify, Wix, STUDIO and more), framework, CDN, analytics tags (GA4/GTM) and web fonts from HTML and header signatures — always with the evidence behind each guess.

Only the URL you enter is sent. We return just the matched strings — never the page or a header dump — and store nothing (it is gone when the request ends).

Enter a URL to see whether the site runs WordPress, which theme it uses, the version it announces, and whether REST API username enumeration, xmlrpc.php, author archives, the default login URL, readme.html or a debug log are exposed. Read-only GETs, never enumeration.

Only the URL you enter is sent; the seven default paths are fetched only when a WordPress fingerprint is found. Usernames are never returned (count only), neither is the page itself, and nothing is stored.

Enter a feed URL or a site URL: we discover the feed, fetch it, and validate its XML syntax, required elements, item list, character encoding and date formats (RFC 822 for RSS, RFC 3339 for Atom). Feeds using the itunes namespace also get the Apple Podcasts required-element check.

Only the URL you enter is sent. The feed itself is never re-served (you get findings and truncated excerpts) and nothing is stored.

Enter a URL to extract every icon declaration (favicon.ico, link rel=icon, apple-touch-icon and Web App Manifest icons), fetch each one and list its real format, dimensions (every size inside an ICO) and weight — with light and dark previews.

Only the URL you enter is sent. We never re-serve the fetched HTML, manifest or images and store nothing (it is gone when the request ends).

Enter a domain and we query Cloudflare DoH (1.1.1.1) for its A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records, then check where www points, whether SPF is published exactly once, and whether CAA exists — no dig required.

Only the domain name you enter is sent (as ten queries to Cloudflare's public DNS). Nothing is stored (it is gone when the request ends).

Enter a domain and a record type; we ask five public resolvers (Cloudflare, Google, OpenDNS and more) at once and line up their answers. TTL and SOA serial separate a propagation delay from a misconfiguration.

Only the domain name and record type you enter are sent (as ten queries to five public resolvers). Nothing is stored (it is gone when the request ends).

Enter a domain and we look up MX, SPF, DKIM and DMARC. We follow every include: to count the SPF DNS lookups against the limit of ten, explain the DMARC policy, and check it all against Google's sender guidelines (2024).

Only the domain name and DKIM selector you enter are sent (up to 40 public DNS queries). No message content is involved and nothing is stored (it is gone when the request ends).

Enter a domain and we query RDAP (the successor to WHOIS) for the registrar, creation date, expiry date, EPP statuses such as clientHold, and name servers. Days until expiry and renewal warnings come first. gTLD servers are resolved via the IANA bootstrap; TLDs without RDAP (including .jp) are reported as such.

Only the domain name you enter is sent (at most two HTTPS GETs: the IANA bootstrap and the registry's RDAP server). We never read registrant or admin contacts, and nothing is stored (it is gone when the request ends).

Enter one candidate name and we check .com, .net, .org, .jp, .co.jp, .dev, .io, .ai, .app and .co at once using RDAP and public DNS. Verdicts are three-way — registered, possibly free, inconclusive — and we never claim a name is definitely available (no affiliate links either).

Only the name taken from your input is sent (at most 44 lookups to the IANA bootstrap, registry RDAP servers and public DNS). We never read registrant contacts, and nothing is stored (it is gone when the request ends).

Shows the public IP, estimated country/city, network (ASN), HTTP/TLS details, User-Agent and main request headers of your current request. Handy for VPN checks and support tickets. Send Accept: text/plain and you get just the IP.

Only the request that opened the page (your IP and headers) reaches the server. It is displayed and never recorded — not even in access logs.

Enter a domain to extract the site's logo, favicons, main colours and company description. Colours are ranked by CSS frequency with contrast ratios on white and black — handy for placeholder branding in proposals and mock-ups.

Only the domain you enter is sent. We never re-serve the fetched HTML, CSS or images (images come back as URL and size only) and store nothing (it is gone when the request ends).

Paste a Japanese business email or proposal to flag phrases that may read as rude, vague, double keigo or too pushy, with drop-in rewrites and cultural pitfalls for English translation (AI-generated advice).

Only the text you enter is sent (checked with Cloudflare Workers AI). Neither the text nor the result is stored (only the date and the total usage count are).

Paste landing page copy and pick an industry (professional services, e-commerce or B2B SaaS) to get estimated scores and comments on clarity, trust, formality and purchase intent from three simulated Japanese buyer personas (AI-generated advice, not real customer feedback).

Only the copy and industry you enter are sent (evaluated with Cloudflare Workers AI). Neither the copy nor the result is stored (only the date and the total usage count are).

Enter a URL to check the Japanese typography of its body text: one-character orphan lines, punctuation at line start, characters per line against the 35–40 guideline and missing Japanese font fallbacks, estimated for desktop and mobile.

Only the URL you enter is sent (we fetch the page and its CSS). We never re-serve the fetched page and store nothing (it is gone when the request ends).

Enter an FAQ or help page and up to three site pages to pull out prices, hours, phone numbers, dates and periods such as "within 7 days", and list every topic where the values disagree. Find outdated FAQ answers.

Only the URLs you enter are sent (each page is fetched once). We never re-serve the fetched pages and store nothing (it is gone when the request ends).

Enter up to three pages of one site to pull the business name, address, phone and opening hours from the text, footer, tel: links and JSON-LD, and list formatting variants and possible mismatches between pages and structured data. Groundwork for local SEO.

Only the URLs you enter are sent (robots.txt and each page are fetched once). We never re-serve the fetched pages and store nothing (it is gone when the request ends).