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

bt.com

https://bt.com· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

bt.com

Mobile

Sponsored

Hosting Provider

Incapsula Inc

IP Address

45.60.65.23

Server Location

🇫🇷 Paris, France

ASN

AS19551

Organization

Incapsula Inc

CDN

CloudFront

Nameservers

EDDNS1.bt.com.DYDNS1.bt.com.EDDNS0.bt.com.DYDNS0.bt.com.

Performance

Page Speed

1.2 MB

95 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Next.js

CMS

Adobe Experience Manager

Infrastructure

Hosting

Incapsula Inc

CDN

CloudFront

Technology Stack

5 Technologies Detected

Libraries

Meta Frameworks

CSS Frameworks

Analytics

SEO Analysis

B70/100

bt.combt.com

Broadband, TV Packages, TNT Sports & Mobile Deals | BT

From Ultra Fast Full Fibre broadband to TV & Mobile, BT helps UK families, communities & companies reach their potential. Find more BT products here.

Title Length54 chars

Recommended: 50-60 chars

Description Length149 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (43/46)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

4 URLs

robots.txt

26 rules

Sitemap reference found

Sponsored

A+

Security Score

91%Excellent

Interactive

HTTPS

WAF

19d

Certificate Details

Type

Extended Validation (EV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

04.03.2025

Valid Until

03.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (14)

www.bt.comassets.bt.combt.comcare.bt.comimg01.bt.co.ukimg01.products.bt.co.ukproducts.bt.comproductsandservices.bt.com+6 more

SHA-256 Fingerprint

79:F9:AC:3E:9E:C1:90:9C:EB:00:A1:C7:5D:31:F6:A0:CD:30:84:6F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

128

apigw-requestid

YsC-0jomrPEEJyA=

cache-control

🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self' *.adobe.com; default-src blob: https:...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

btgroupcloud-mail-onmicrosoft-com.mail.protection.outlook.com

Domain Information

bt.com

Domain Age

33y 8m

Created

18.06.1992

Expires

17.06.2026

Last Updated

04.06.2025

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

BT Curve

79/100

Readability

/30

40/40

20px · LH 1.40

Hierarchy

/20

21/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

BT Curve

Sans40px

Body Font

BT Curve

Sans20px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

40px

48px

20px

Minor Third

Scale

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

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

✅ Good performance: Using 2 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.

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

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(16)gstatic.com(1)assets.adobedtm.com(1)js-cdn.dynatrace.com(1)google.com(1)

Website Identity

bt.com

33 years old

Network Solutions, LLC📧 Microsoft 365

Sponsored

Last analyzed: 12 Feb 2026 at 21:52

Historical Analysis & Change Tracking