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.

Back to Search

acas.org.uk

https://acas.org.uk· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

acas.org.uk

Mobile

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.131.52

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

Server

Apache

CDN

Fastly

Nameservers

dns1.star.co.uk.dns0.star.co.uk.

Performance

Page Speed

236 KB

57 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

7 Technologies Detected

CSS Frameworks

Libraries

Analytics

Tag Managers

Other

Web Servers

SEO Analysis

B76/100

acas.org.ukacas.org.uk

Acas | Making working life better for everyone in Britain

Acas is the workplace expert for England, Wales and Scotland. We provide free and impartial advice for employers and employees, training and help resolve dis...

Description truncated.

Title Length57 chars

Recommended: 50-60 chars

Description Length163 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,157 URLs

robots.txt

47 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

254d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GoDaddy.com, Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

03.10.2025

Valid Until

01.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.acas.org.ukacas.org.uk

SHA-256 Fingerprint

8E:19:23:DD:47:50:4A:5F:5D:7E:D2:B4:9F:CE:2F:28:E5:EA:2D:7F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

alt-svc

h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=864...

cache-control

🟡 300s(max-age=300, public)

content-encoding

📦 Gzip(gzip)

content-language

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

acas-org-uk.mail.protection.outlook.com

Domain Information

acas.org.uk

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

Century Gothic Bold + Open Sans

81/100

Readability

/30

40/40

22px · LH 1.50

Hierarchy

/20

18/25

2.09x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Century Gothic Bold

Sans46px

Body Font

Open Sans

Sans22px

Contrast Ratio

Reading Comfort

~31 CPL

Needs attention

46px

32px

19px

22px

✅ Excellent readability: 22px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.1x larger than body text.

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

⚠️ Cramped layout: 14 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

A/B Testing & Optimization

VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(18)cdn-ukwest.onetrust.com(1)googletagmanager.com(1)

Website Identity

acas.org.uk

📧 Microsoft 365

Social Profiles

Facebook X (Twitter)Instagram LinkedIn YouTube

Sponsored

Last analyzed: 19 Feb 2026 at 23:59

Historical Analysis & Change Tracking