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

code.org

https://code.org· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

code.org

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

18.165.122.85

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

CloudFront

CDN

CloudFront

Nameservers

ns-1497.awsdns-59.org.ns-1652.awsdns-14.co.uk.ns-269.awsdns-33.com.ns-678.awsdns-20.net.

Performance

Page Speed

975 KB

114 requests

Image Optimization

Lazy LoadWebPAVIFResponsiveVercel Image Optimization

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

CMS

Medium

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Technology Stack

8 Technologies Detected

CSS Frameworks

Analytics

Meta Frameworks

Icon Libraries

Fonts

CDN

SEO Analysis

B76/100

code.orgcode.org

Free K–12 Curriculum for Computer Science and AI | Code.org

Bring computer science and AI education to your classroom with Code.org’s free K–12 curriculum, hands-on projects, and teacher professional development—no pr...

Description truncated.

Title Length59 chars

Recommended: 50-60 chars

Description Length179 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (33/51)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

2,507 URLs

robots.txt

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

390d

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

09.02.2026

Valid Until

10.03.2027

OCSP Stapling

Enabled

Subject Alternative Names (3)

code.marketing-sites.code.orgcode.orgpreview-code.marketing-sites.code.org

SHA-256 Fingerprint

24:CE:48:44:79:2A:44:57:B5:6D:87:CF:EF:FE:18:64:FB:9B:44:A6...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

3813

cache-control

⚪ Custom(s-maxage=900, stale-while-revalidate=31535100, stale-if-erro...)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Fri, 13 Feb 2026 15:54:21 GMT

etag

"b0qu6mf73ikoxg"

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt2.aspmx.l.google.com

aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx2.googlemail.com

+1 more

Domain Information

code.org

Domain Age

26y 4m

Created

28.09.1999

Expires

28.09.2026

Last Updated

29.08.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

Barlow Semi Condensed Semibold + Figtree

59/100

Readability

/30

40/40

20px · LH 1.40

Hierarchy

/20

21/25

2.4x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Barlow Semi Condensed Semibold

Sans48px

Body Font

Figtree

Sans20px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

48px

34px

28px

24px

20px

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

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

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

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

⚠️ Cramped layout: 20 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

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(20)

Website Identity

code.org

26 years old

Amazon Registrar, Inc.📧 Google Workspace

Social Profiles

Facebook X (Twitter)Instagram Medium

Sponsored

Last analyzed: 13 Feb 2026 at 16:58

Historical Analysis & Change Tracking