What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

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shef.ac.uk

https://shef.ac.uk· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

shef.ac.uk

Mobile

Sponsored

Hosting Provider

University of Sheffield

IP Address

143.167.2.102

Server Location

🇬🇧 Sheffield, United Kingdom

ASN

AS786

Organization

University of Sheffield

Server

Nginx

CDN

Fastly

Nameservers

katheter.st-and.ac.uk.ns4.ja.net.hippo.shef.ac.uk.acheron.shef.ac.uk.

Performance

Page Speed

1.1 MB

30 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

6 Technologies Detected

Libraries

CSS Frameworks

Icon Libraries

Analytics

Tag Managers

Web Servers

SEO Analysis

B76/100

shef.ac.ukshef.ac.uk

Home | The University of Sheffield

A world-class university – a unique student experience. Sheffield is a research university in the Russell Group with a global reputation for excellence.

Title Length34 chars

Recommended: 50-60 chars

Description Length152 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (21/31)

2 issues found

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Crawlability

Sitemap

Type: index

2 URLs

robots.txt

47 rules

Sitemap reference found

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

112d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-384 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.06.2025

Valid Until

06.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (10)

*.students.acquia.shef.ac.uk*.public.acquia.shef.ac.uk*.staff.acquia.shef.ac.uk*.training.acquia.shef.ac.ukbeta-qa.shef.ac.ukbeta.shef.ac.ukcdn.sheffield.ac.uksheffield.ac.uk+2 more

SHA-256 Fingerprint

44:BF:7A:8F:7B:EC:07:EE:CA:2A:E2:BC:BD:D1:4F:E1:D6:47:0C:6E...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

47290

cache-control

🟡 900s(max-age=900, public, s-maxage=604800)

content-encoding

📦 Gzip(gzip)

content-language

content-length

19722

Good Warning Issue

Email Infrastructure

Google Workspace

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

aspmx.l.google.com

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

alt3.aspmx.l.google.com

+1 more

Domain Information

shef.ac.uk

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

Source Serif + sans-serif

68/100

Readability

/30

40/40

18px · LH 1.60

Hierarchy

/20

25/25

2x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Source Serif

Serif36px

Body Font

sans-serif

Sans18px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

36px

16px

22px

15px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

⚠️ Risky: Text appears on background images without overlay protection.

⚠️ Cramped layout: 24 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn-ukwest.onetrust.com(2)cdn.sheffield.ac.uk(2)

Website Identity

Instagram TikTok Bluesky

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Last analyzed: 14 Feb 2026 at 01:39

Historical Analysis & Change Tracking