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

energysavingtrust.org.uk

https://energysavingtrust.org.uk· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.26.9.72

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

justin.ns.cloudflare.com.carrera.ns.cloudflare.com.

Performance

Page Speed

2.3 MB

49 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9.1

cms

chdCustom

Technology Stack

13 Technologies Detected

Analytics

Plugins

Libraries

UI Components

Other

CSS Frameworks

Fonts

Tag Managers

Advertising

CDN

SEO Analysis

A88/100

energysavingtrust.org.ukenergysavingtrust.org.uk

Energy Saving Trust

Energy Saving Trust is working to address the climate emergency. We're a trusted expert on energy efficiency and low carbon solutions.

Title Length19 chars

Recommended: 50-60 chars

Description Length134 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Sponsored

A+

Security Score

91%Excellent

Interactive

HTTPS

WAF

75d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

03.02.2026

Valid Until

04.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

energysavingtrust.org.uk*.energysavingtrust.org.uk

SHA-256 Fingerprint

08:D7:9E:12:C2:78:71:6F:73:35:7D:D6:E2:DF:A9:63:54:B2:13:9E...

Upgrade to view header details

HTTP Headers

Developer Console

x-dns-prefetch-control

content-type

text/html; charset=UTF-8

link

<https://energysavingtrust.org.uk/wp-json/>; rel="https://ap...

nel

{"report_to":"cf-nel", "success_fraction":0.0, "max_age":604...

x-litespeed-cache

hit

server-timing

cfCacheStatus;desc="DYNAMIC", cfEdge;dur=12, cfOrigin;dur=39...

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

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

Domain Information

energysavingtrust.org.uk

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

-apple-system

80/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

3.47x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

-apple-system

Sans52px

Body Font

-apple-system

Sans15px

Contrast Ratio

Reading Comfort

~55 CPL

Optimal (45–75)

52px

20px

30px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.5x larger than body text.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

GGoogle Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

energysavingtrust.org.uk(7)googletagmanager.com(2)cdn.cookiehub.eu(1)e.infogram.com(1)bugherd.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

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Last analyzed: 17 Feb 2026 at 23:53

Historical Analysis & Change Tracking