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Technical & on-page SEO audit

See your site the way search engines do.

Sitelens crawls your pages, runs 60 checks and tells you — in plain English — what's broken, why it matters and exactly how to fix it. Try one page now.

Checks
60
Categories
7
Pages / audit
5kmax
Free page checkPOST /api/check

No sign-up. Fetches one page as SitelensBot and runs every page-level check.

CrawlabilityPage could not be loadedCrawlabilityPage returns a 4xx errorCrawlabilityPage returns a server error (5xx)CrawlabilityRedirect chain (2+ hops)CrawlabilityTemporary (302/307) redirectCrawlabilityPage is set to noindexCrawlabilityNo canonical tagCrawlabilityCanonical points to another URLCrawlabilityCanonical points to a broken or redirecting URLCrawlabilityMissing lang attributeCrawlabilityURL is very longCrawlabilityURL has uppercase letters, underscores or spacesCrawlabilityDuplicate page contentCrawlabilityPage is more than 3 clicks from the homepageCrawlabilitySitemap lists a URL that doesn't return 200CrawlabilityOrphan page (only in the sitemap)CrawlabilityNo robots.txt fileCrawlabilityrobots.txt blocks the whole siteCrawlabilityNo XML sitemap foundSecurityHTTP version doesn't redirect to HTTPSCrawlabilityBoth www and non-www versions loadCrawlabilityMissing pages return 200 (soft 404)On-pageMissing title tagOn-pageTitle is too long (> 60 characters)On-pageTitle is too short (< 20 characters)On-pageDuplicate titleOn-pageMissing meta descriptionOn-pageMeta description is too long (> 160 characters)On-pageMeta description is too short (< 70 characters)On-pageDuplicate meta descriptionOn-pageMissing H1 headingOn-pageMultiple H1 headingsOn-pageHeading levels are skippedOn-pageThin content (< 300 words)On-pageImages without alt textOn-pageNo structured dataOn-pageInvalid JSON-LD structured dataLinksBroken internal linksLinksBroken external linksLinksInternal links point to redirectsLinksNofollow on internal linksLinksToo many links on the page (> 300)LinksNo outgoing internal linksLinksLinks without anchor textSpeedSlow server response (> 1.5 s)SpeedLarge HTML document (> 500 KB)SpeedHTML isn't compressedSpeedMany script files (> 20)SpeedMany stylesheets (> 10)SpeedImages without width/heightSpeedMany images load eagerlySecurityPage served over HTTPSecurityMixed content (HTTP resources on HTTPS page)SecurityNo HSTS headerSecurityMissing security headersMobile & UXNo mobile viewport tagMobile & UXNo faviconSocialMissing Open Graph tagsSocialNo og:imageSocialNo Twitter/X card
01What we check

60 checks.
Seven categories.
One score.

Every check comes with a severity, a plain-English explanation of why it matters and a concrete fix. Category scores roll up into a single 0–100 site score, weighted by impact.
01weight 24%

Crawlability

21

Can search engines reach, render and index your pages?

  • Page could not be loaded
  • Page returns a 4xx error
  • Page returns a server error (5xx)
  • Redirect chain (2+ hops)
  • + 17 more
02weight 24%

On-page

15

Titles, descriptions, headings and content quality.

  • Missing title tag
  • Title is too long (> 60 characters)
  • Title is too short (< 20 characters)
  • Duplicate title
  • + 11 more
03weight 14%

Links

7

Broken links, redirects and internal linking.

  • Broken internal links
  • Broken external links
  • Internal links point to redirects
  • Nofollow on internal links
  • + 3 more
04weight 14%

Speed

7

Response time, page weight and loading hints.

  • Slow server response (> 1.5 s)
  • Large HTML document (> 500 KB)
  • HTML isn't compressed
  • Many script files (> 20)
  • + 3 more
05weight 10%

Security

5

HTTPS, mixed content and security headers.

  • HTTP version doesn't redirect to HTTPS
  • Page served over HTTP
  • Mixed content (HTTP resources on HTTPS page)
  • No HSTS header
  • + 1 more
06weight 7%

Mobile & UX

2

Viewport, accessibility basics and favicons.

  • No mobile viewport tag
  • No favicon
07weight 7%

Social

3

How links look when shared on social and chat apps.

  • Missing Open Graph tags
  • No og:image
  • No Twitter/X card

08

Severity weights

error
30
warning
12
notice
3
How scoring works
Site report — example.orgillustrative data · 120 pages
78
Site score

weighted average of 7 categories

Categories

  • Crawlability81
  • On-page64
  • Links92
  • Speed77
  • Security95
  • Mobile & UX100
  • Social48
IssuePages
Broken internal links7
Duplicate title18
Missing meta description23
Redirect chain (2+ hops)4
Thin content (< 300 words)11
No og:image31
Images without width/height40
02How it works

From URL to a ranked
to-do list.

No setup, no tracking script, no verification dance for a first audit. Sitelens reads your site from the outside — the same way a search engine does.
  1. 01

    Add a site

    Paste a start URL. Optionally limit the crawl to certain paths or exclude sections like /blog/tag/.

  2. 02

    We crawl it

    SitelensBot follows internal links and your XML sitemaps, respects robots.txt and fetches up to 50 / 1,000 / 5,000 pages depending on plan.

  3. 03

    Prioritised fixes

    Issues are grouped by severity and impact, each with why it matters, how to fix it and the exact URLs affected.

  4. 04

    Re-audit & track

    Run it again after you ship — or on a schedule. Every audit is kept, so you see the score trend and what changed.

Score history

illustrative · 8 audits

81

+7 since last audit

12 fixed

·

3 new

  • fixedBroken internal links7
  • fixedRedirect chain (2+ hops)4
  • fixedNo canonical tag1
  • newImages without alt text2
  • newTitle is too long (> 60 characters)1
03Keep it fixed

Audits that run
while you work.

SEO regressions rarely announce themselves. A plugin update adds noindex, a redesign drops the meta descriptions. Scheduled audits catch it the week it happens.

Scheduled audits & email reports

Set a schedule once. Get a short email after every audit — score, change, what's fixed and what's new.

Planmonthlyweeklydaily
Free–––
Pro✓✓–
Agency✓✓✓

Email preview — illustrative

From: Sitelens

Subject: example.org: SEO score 81 (+7)

Your scheduled audit of example.org is ready.

81 ▲7

Pages crawled: 120 · Errors: 2 · Warnings: 9

Fixed since last audit: 12 · New issues: 3

Open full report →

Exports Pro+

Hand it to your developer, client or spreadsheet.

  • Issues CSV

    severity,category,issue,url,detail

  • Pages CSV

    url,status,depth,inlinks,indexable,load_ms,title,h1…

  • Printable PDF report

    Scores, categories and every issue with its fix — save as PDF from the print view.

On-page keyword optimizer

Pick the phrase a page should rank for. See where it's missing.

01Title

02Title start

03Meta description

04H1

05Subheadings H2–H3

06URL slug

07First 120 words

08Density 0.5–3%

09Content length

Try it in the free checker

04What we don't do (yet)

Honest scope.

Sitelens runs entirely on its own crawler — no resold third-party SEO data. That means we focus on what you control: the pages, markup, links and server behaviour of your own site. If you need rank tracking or backlink analysis, use a dedicated tool alongside us.

  • Not yet

    Keyword rankings

    We don't track where you rank in Google for a list of keywords.

  • Not yet

    Search volumes

    No keyword research database or traffic estimates.

  • Not yet

    Backlink data

    No index of links pointing to your site from other domains.

  • Not yet

    Competitor spying

    We audit sites you're responsible for, not your competitors' traffic.

05Our crawler

A polite
robot.

  • Respects robots.txtDisallow rules for SitelensBot (or *) are honoured.
  • Identifies itselfEvery request carries a clear user agent with a link to this page.
  • Rate-limitedA handful of concurrent requests per site, never a flood.
  • Only what you askCrawls start from a URL a user submitted, within page limits.
Crawler documentation Report a crawler issue

User-Agent

Mozilla/5.0 (compatible; SitelensBot/1.0; +https://sitelens.dev/bot)

/robots.txt — block Sitelens

User-agent: SitelensBot
Disallow: /

/robots.txt — block one section

User-agent: SitelensBot
Disallow: /internal/
Allow: /

06FAQ

Questions.

More in the docs, or ask us.

Do you track keyword rankings or backlinks?
Not yet. Sitelens doesn't buy or resell third-party SEO data, so there are no rankings, search volumes or backlink profiles. We focus on what you control on your own site: crawlability, on-page content, links, speed, security, mobile basics and social previews.
Do I need to install anything or verify my site?
No. Sitelens reads your site from the outside, exactly like a search engine would. There's no tracking script and no Search Console connection.
How many pages do you crawl?
Up to 50 pages per audit on Free, 1,000 on Pro and 5,000 on Agency. You can set a lower limit and include or exclude paths for each site.
What exactly is checked?
60 checks across crawlability, on-page, links, speed, security, mobile & UX and social. The full reference lists every check with why it matters and how to fix it.
How is the score calculated?
Each category starts at 100 and loses points per issue, weighted by severity and by the share of pages affected. The site score is a weighted average of the categories. Details in the docs.
Can I audit sites that aren't mine?
You can check any public page with the single-page checker. Full-site audits should be run on sites you own or manage — our crawler respects robots.txt and site owners can block it.
Is the free plan really free?
Yes — 1 site, up to 50 pages per audit and 10 audits a month, with no card required.

Start with
one URL.

Free plan, no card required. Add a site and the first audit starts right away.

Audit your site — free See pricing