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

circleci.com

https://circleci.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

circleci.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

18.165.122.24

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

CDN

CloudFront

Nameservers

ns-1572.awsdns-04.co.uk.ns-225.awsdns-28.com.ns-837.awsdns-40.net.ns-1065.awsdns-05.org.

Performance

Page Speed

1 KB

59 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

Frontend

Styling

Tailwind CSS

API

Data Source

Headless CMS

Contentful

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Progressive Web App

Web ManifestApple Touch IconTheme Color

Detected API Sources

//images.ctfassets.net/il1yand...

Technology Stack

13 Technologies Detected

Analytics

Google Analytics

Facebook Pixel

Hotjar

Segment Amplitude Microsoft Clarity

Advertising

Google Ads LinkedIn Ads

CSS Frameworks

Fonts

Tag Managers

Marketing

Other

SEO Analysis

B78/100

circleci.comcircleci.com

Autonomous validation for the AI era - CircleCI

Deliver production-ready software at AI speed. CircleCI helps modern teams validate, test, and ship every change with intelligent automation.

Title Length47 chars

Recommended: 50-60 chars

Description Length141 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (44/46)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

206 URLs

robots.txt

19 rules

Sitemap reference found

Sponsored

A+

Security Score

91%Excellent

Static / Informational

HTTPS

No WAF

351d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.01.2026

Valid Until

04.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (5)

circleci.comcanary.circleci.comexperiment.circleci.combadges.circleci.comemail.circleci.com

SHA-256 Fingerprint

13:3B:CC:17:62:69:DC:BA:D7:DE:AB:0A:18:99:03:52:C3:DC:AD:74...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 10s(private,max-age=10)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Wed, 18 Feb 2026 08:07:24 GMT

etag

W/"9a62bb119aadc24cd155e6468cf3653d"

feature-policy

autoplay 'none'; camera 'none'

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mxa-00672001.gslb.pphosted.com

mxb-00672001.gslb.pphosted.com

Domain Information

circleci.com

Domain Age

14y 5m

Created

01.09.2011

Expires

01.09.2026

Last Updated

11.11.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

ui-sans-serif

76/100

Readability

/30

32/40

14px · LH 1.40

Hierarchy

/20

21/25

5.07x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

ui-sans-serif

Sans71px

Body Font

ui-sans-serif

Sans14px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

71px

14px

24px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 5.1x 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

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

d2qm0z2kzhiwa.cloudfront.net(15)consent.cookiebot.com(2)

Website Identity

circleci.com

14 years old

Amazon Registrar, Inc.

Social Profiles

X (Twitter)LinkedIn GitHub

Sponsored

Last analyzed: 18 Feb 2026 at 08:07

Historical Analysis & Change Tracking