19 free website QA and AI-visibility tools. Remote HTTP MCP, no account, no API key.
Scored across 16 tools
Most tools target a distinct artifact (favicon, og:video, robots.txt for AI, social preview, JSON-LD, tech stack) and descriptions explicitly route callers between near-neighbours, e.g. check_ai_visibility vs check_robots_txt_for_ai and check_social_preview vs check_og_video. The remaining overlap is that check_ai_visibility is a superset containing the robots/AI-access checks, and check_social_preview and check_og_video both touch og:image/twitter cards, so an agent could occasionally pick the broader tool when the narrow one was wanted.
Almost every name is snake_case verb_noun (build_utm_url, check_favicon, generate_llms_txt, validate_json_ld), which is highly predictable. Minor deviations: page_to_markdown is noun_to_format rather than verb_noun, and hash_md5 names the algorithm rather than the object being acted on.
16 tools is slightly above the comfortable band but each one covers a distinct diagnostic, so nothing feels padded. The set is a grab-bag though: hash_md5 and find_meeting_times sit outside the web-page-diagnostics theme and feel like unrelated utilities bolted onto the same server.
For a web-page inspection toolkit the surface is unusually complete: uptime, favicon, social/OG video, tech stack, AI crawler access, AI citation readiness, llms.txt generation, JSON-LD generation plus validation, alt text, screenshots, and markdown extraction, with read-only validate vs model-based generate both present. The remaining gaps (page speed/Core Web Vitals, broken-link and canonical/hreflang checks) are outside the stated scope rather than dead ends in covered workflows.
Build a campaign URL with utm parameters, normalised to one tagging convention, and report which GA4 default channel group the link will land in. Warns about the mistakes that silently break reporting: an unrecognised medium that drops traffic into Unassigned, casing that splits one source into several report rows, PII in a campaign name. Pure string work: nothing is fetched and nothing is stored.
Returns { url, normalized, channel, issues[] with level, field and message }. Limit: None. The work is local and costs nothing.. Allow up to 10s for a response. Free, no account, no API key.
Inputs: url (required), id, term, medium, +6 more.
Capture a full-height PNG of a page in a real headless browser, scrolling first so lazy-loaded content renders. Returns a signed link to the image that expires in about 24 hours; download the bytes if you need to keep them. No watermark and no height cap. Cannot capture anything behind a login.
Returns { imageUrl, expiresAt, bytes, width, height, deviceType }. Limit: 10 runs per hour per IP. Allow up to 90s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Check whether AI assistants (ChatGPT, Claude, Perplexity, Google AI) can reach, read, and cite a web page. Runs the full suite: robots.txt rules per AI crawler, a live firewall test that requests the page as GPTBot, JavaScript dependency, llms.txt, headings, structured data, and author identity. Returns a score out of 100 with a grade, a score per category, and a finding per check with why it matters and how to fix it. Use this for a whole-page verdict; use check_robots_txt_for_ai when the question is only about crawler access.
Returns { ok, report: { score, grade, scoredOutOf, categories[], findings[] with why and fix, detection }, cached, ageSeconds }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Check whether a site's favicon actually works. Reads every icon declaration in the page head, then fetches each one, the web app manifest, and the implicit /favicon.ico, and identifies the real format and pixel dimensions from each file's header bytes. Catches the failures a status-code check misses: a catch-all route answering an icon path with HTML at HTTP 200, a sizes attribute that disagrees with the file, an icon served over http on an https page. Use this when a favicon is missing or blurry; use check_social_preview for the image that appears when a link is shared.
Returns { hasWorkingFavicon, tabIcon, icons[] with format, dimensions, bytes and problem, manifest, themeColor, checks[] with id, status and fix, counts }. Limit: 60 runs per hour per IP. Allow up to 30s for a response. Free, no account, no API key.
Inputs: url (required), refresh.
Check whether a page's og:video plays when its link is shared. Reads every og:video declaration and its structured properties (secure_url, type, width, height) the way ogp.me defines them, then fetches the first 512 KB of the video and identifies the real format from the file header, along with byte-range support, MP4 fast start, pixel size and length. Also fetches og:image as the poster and reports the tags the other readers use instead: the X player card (twitter:card player, twitter:player) and a Google VideoObject in JSON-LD. Pass the page URL, not the video file. Use check_social_preview for how the title, description and image render per platform.
Returns { hasPlayableVideo, primary, videos[] with declared tags and probe (format, kind, dimensions, durationSeconds, rangeSupported, fastStart, problem), image, ogType, videoMeta, twitter, videoObject, checks[] with id, status and fix, counts }. Limit: 60 runs per hour per IP. Allow up to 30s for a response. Free, no account, no API key.
Inputs: url (required), refresh.
Test a site's robots.txt against every AI crawler that matters (GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot, Googlebot, Bingbot and the rest) and report which are allowed, which are blocked, and which rule decided it. Also runs a firewall test, because CDN-level blocks stop crawlers before robots.txt is ever read. This is the access-scoped view of check_ai_visibility.
Returns { ok, report: { accessScore, crawlers[] with the rule that decided each verdict, firewall, findings[] }, cached, ageSeconds }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Read a page's Open Graph and Twitter card tags and report how the link will render on X, LinkedIn, Facebook, Slack, Discord, and Google. Returns a per-platform preview (title, description, image) plus the findings for tags that are missing, truncated, or the wrong size.
Returns { ok, report: { previews[] per platform, tags, summary, findings[] }, cached, ageSeconds }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Check whether a website is up right now. Makes one live GET request to the URL from Superflow's servers, following redirects, and reports a verdict: up when the server answers with any HTTP status below 500, down on a 5xx, a timeout after 10 seconds, a refused connection, or an unresolvable domain. Returns the HTTP status, the response time, the final URL after redirects, and the time of the check. Never cached, so every call is a fresh request. Use this to answer 'is it down or is it just me'; use check_favicon or check_social_preview to inspect what a page contains.
Returns { verdict: 'up' | 'down', reason?, httpStatus?, responseTimeMs, requestedUrl, finalUrl, redirectCount, checkedAt, submittedUrl }. Limit: 60 runs per hour per IP. Allow up to 30s for a response. Free, no account, no API key.
Inputs: url (required).
Identify the platform, framework, CMS, ecommerce apps, analytics, CDN, and hosting behind a site by fingerprinting one page's HTML and response headers. One fetch, no rendering and no crawl, so it answers in about a second. A site behind bot protection is reported as blocked rather than as empty.
Returns { platformName, theme, apps[], fonts[], analytics[], hosting[], renderMode, url, status, fetchedAt }. Limit: 60 runs per hour per IP. Allow up to 30s for a response. Free, no account, no API key.
Inputs: url (required), refresh.
Find overlapping working hours and meeting times across cities or countries. Resolves locations to IANA time zones and applies daylight saving for the requested date. Returns resolved locations, overlap windows, the earliest matching meeting starts with UTC and local times, readable copy text, and a link to open the plan. Ambiguous names or countries with multiple zones return choices: retry with a returned location ID or a more specific city/region/country. The same working schedule is applied in each location's local time; the browser plan supports individual schedules. Does not access calendars, account for holidays, send invitations, or book meetings.
Returns { ok, date, dateZone, durationMinutes, locations[], overlapMinutes, overlapWindows[], slots[] with UTC/local times and copyText, totalAvailableStarts, hasMore, planUrl, availability }. Limit: No application rate limit. Up to 8 locations, 20 returned starts, and a 16 KB request body; no result storage.. Allow up to 10s for a response. Free, no account, no API key.
Inputs: date (required), locations (required), limit, workEnd, +3 more.
Find every image on a page and draft alt text for the ones that need it, using a vision model that actually looks at the image. Lists every image with the alt it has today, the suggested alt, whether it looks decorative, and why any image was skipped. Up to 10 images per run go to the model. The suggestions are drafts for a human to review.
Returns { images[] with src, hadAlt, currentAlt, suggestedAlt, isDecorative, skippedReason; counts; model }. Limit: 10 runs per hour per IP. Allow up to 90s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Read a page and write a schema.org JSON-LD block for it, then validate that block against the same checks a validator would run. The markup is model-written from the page's own content and should be reviewed before it is published. Returns the block ready to paste into a tag.
Returns { ok, report: { detectedType, jsonLd, jsonLdString, validation: { findings[], passed }, model } }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Generate llms.txt and llms-full.txt for a site, following the llmstxt.org convention. Inventories the site from its robots.txt, sitemaps, and homepage links, then writes an index file and a full file with page content inlined. Deterministic: no model is involved, so two runs over an unchanged site produce the same bytes. Returns the file contents ready to write to disk.
Returns { ok, report: { siteName, llmsTxt, llmsFullTxt, pagesDiscovered, pagesIncluded, truncated }, cached, ageSeconds }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Hash text to an MD5 hex digest. Useful for checksums, cache keys, dedupe keys, and Gravatar-style identifiers. MD5 is broken for anything security-related: never use it for passwords or to verify authenticity.
Returns { md5, algorithm, bytes }. Limit: None. The work is local and costs nothing.. Allow up to 10s for a response. Free, no account, no API key.
Inputs: text (required).
Fetch one web page and convert it to clean CommonMark, with the navigation, cookie banners, and boilerplate stripped out. Use this to read a page as text an agent can reason over, or to publish a .md copy of a page alongside the HTML.
Returns { ok, report: { markdown, title, description, wordCount, bytes, truncated, httpStatus }, cached, ageSeconds }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
Read the structured data already on a page and check it against Schema.org and what search engines actually accept. Reports every JSON-LD block found, the type of each, and the errors and warnings per block.
Returns { ok, report: { blockCount, invalidBlockCount, declaredTypes[], eligibility[], categories[], findings[] } }. Limit: 10 runs per hour per IP. Allow up to 75s for a response. Free, no account, no API key.
Pass url to start a run. A slow run answers with { status: "pending", runId } instead of a result: call this same tool again with just that runId to collect it, as many times as it takes. Collecting costs no rate-limit slot.
Inputs: url, runId, refresh.
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Screenshot, diff, audit and sitemap-capture any web page — 5 MCP tools for AI agents.
Security, SEO and AI-visibility scanner for web apps · free scans and focused checks via MCP.
Website QA for your coding agent: audit SEO, performance, security, accessibility over MCP.
Website checker for AI coding agents. Measures your site in a real browser, with evidence.
Add one secure layer between your agents and this server.
