Wrendex
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High quality sites get more customers

Wrendex is a site structure monitor with 140+ checks, has a built-in MCP server, and is built to be fast for very large sites. Let Wrendex help you ensure your site is as great as it could be.

Free audit, no signup 140+ checks Results in minutes

See the audit, not a dump of URLs

Every monitored site gets one page: a health score and its trend, what changed since the last crawl, the three things to fix first, and every issue grouped by category.

What Wrendex checks

Every audit runs these checks. We do more than some big players.

Duplicate code block detection

Duplicate tracking scripts, CSS rules and libraries, caught even in differently-named bundles.

Content change detection

Title, meta description, H1, word count, indexability and redirect-target changes between crawls.

Broken JS / CSS detector

Every script and stylesheet your pages load is requested, and the ones that would fail are flagged.

There is also always a human on the end of support.

What makes us unique

Duplicate code block detection

Advanced duplicate code block detection helps you get the edge over your competition on page load times. Example issues found:

  • Duplicate tracking scripts.
  • Duplicate CSS rules in different stylesheets.
  • Duplicate libraries loaded.
  • Poorly written code.

Wrendex compares the code itself, not just the URLs, so duplicates hiding in differently-named bundles still get caught, on every page, on every crawl.

Broken JS / CSS detector

Wrendex requests every script and stylesheet your pages load and flags the ones that would fail to load.

27 categories, every audit

All 27 categories run on every audit. Browse the full check catalog.

Ongoing monitoring

Setup takes about a minute. After that, Wrendex audits on your schedule, compares every run to the last one, and only speaks up when something breaks.

  1. Connect

    Paste your URL and verify ownership with a click. Your first full-depth audit starts immediately. Nothing to install, no sales call.

  2. Monitor

    Wrendex re-audits daily, weekly, or on every deploy, and tracks each issue against the previous run so a regression can’t hide. Full-site or single-page crawls.

  3. Fix

    When something breaks, you get a Slack or email alert with the exact check, the affected pages, and how to fix it. Share a live report link, or export PDF or CSV for clients.

Works with Claude, Cursor, and Codex

Wrendex has an MCP server so your coding agent works from the audit itself. Point Claude Code, Cursor, or Codex at it and the loop runs in your editor.

Read the MCP setup docs

  1. Pull: audit results land in your agent's context.
  2. Fix: the agent patches the issue in your codebase.
  3. Verify: a re-crawl confirms the check passes.

Free for small sites

5,000 crawl credits a month, no card. Then $19.99 for 25,000 more that never expire.

Free

$0 / month

Every plan includes:

  • Unlimited sites & team seats
  • 500 MB report storage
  • 1 credit per page fetched (2 with real-browser rendering); unchanged pages carried forward free
  • Top up anytime: packs never expire, up to 94% off at volume
  • Every alert channel: Email, Slack, Teams, PagerDuty
  • White-label reports + custom subdomain
  • SAML SSO & full audit history
  • GDPR and CCPA compliant, data stored in the EU, 99.99% uptime target
Start free

Estimate your monthly cost

1,000
Weekly
5%
First crawl1,000
Credits / page1
Monthly re-crawl credits400
Free allowance (5,000 credits a month)$0.00
Estimated monthly cost$0.00
vs Ahrefs Free ($0/mo)also free

Top-up packs

Top-ups can refill automatically. Packs you buy never expire and are spent after the free allowance.

PackCreditsPricePer 1,000Discount
Free allowance (5,000 a month, resets on the 1st) 5,000 $0 - -
Wren 25,000 $19.99 $0.7996 -
Hawk 500,000 $99 $0.198 75% off vs Wren
Eagle 2,000,000 $199 $0.0995 88% off vs Wren
Albatross 10,000,000 $599 $0.0599 93% off vs Wren

Running client sites? The full pricing page covers the Studio and Agency tiers, annual invoicing, and enterprise.

Reports for your boss

They look nicer than our marketing site.

ReportDetailsFormats
Health score history90-day trend of the aggregate score with per-category severity stacks. Annotate releases to correlate regressions with deploys.HTML, JSON
Page explorerCrawled URLs with status, depth, word count.HTML, CSV
Link explorerSource to target edge with anchor text, rel attributes, and HTTP status.HTML, CSV
Site structure mapClick-depth tree rooted at the homepage, with orphan islands surfaced separately.SVG, JSON
Redirect chainsMulti-hop redirects with the full path, terminal status, and root page. Loops are flagged.HTML, CSV
Duplicate contentExact and near-duplicate clusters, with separate reports for titles, descriptions, and body text.HTML, JSON
Structured dataPer-schema validity sheet with line-level errors against schema.org.HTML, JSON-LD
ResourcesAll images, scripts, and stylesheets across the crawl.HTML, CSV

FAQ

Need something else? Ask us directly.

How is this different from Ahrefs?

Ahrefs is a great research suite. Wrendex specializes in site structure. Some of our customers run both. Full comparison.

Who makes this?

Wrendex is a WinrickLabs.com project. You might know us from FastComments.

How long does setup take?

About 60 seconds. Paste your URL and your first full audit runs immediately. No tags to add to your site, no code to install, no sales call required to get started. Verify ownership to do full crawls.

How often will you audit my site?

Daily, weekly, or monthly, your choice per site. You’ll get a Slack or email alert the moment a regression appears. Re-crawls fetch what changed plus a small rotating slice of the rest, so daily on a big site stays affordable.

Where is my data stored?

Encrypted at rest (full disk encryption) on Hetzner infrastructure in Helsinki, Finland (EU), today. Wrendex is GDPR compliant. Audit results are yours: we never sell, share, or train on them.

Try it on your site

Run a full-depth audit on your site right now.