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.

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nrc.nl

https://nrc.nl· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

nrc.nl

Mobile

Sponsored

Hosting Provider

Intermax Cloudsourcing B.V.

IP Address

46.22.183.139

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS24586

Organization

Intermax Cloudsourcing B.V.

Server

Nginx

CDN

Proxy Cache

Nameservers

eva.ns.cloudflare.com.phil.ns.cloudflare.com.

Performance

Page Speed

3 KB

22 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Nginx

SEO Analysis

B78/100

nrc.nlnrc.nl

NRC - Nieuws, achtergronden en onderzoeksjournalistiek

Nieuws, duiding, analyse en onderzoeksjournalistiek over onderwerpen die er echt toe doen. Feitelijk, betrouwbaar, diepgravend en genuanceerd.

Title Length54 chars

Recommended: 50-60 chars

Description Length142 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (186/188)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

96 rules

Sitemap reference found

Sponsored

Security Score

78%Good

Static / Informational

HTTPS

No WAF

45d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

12.03.2025

Valid Until

30.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.nrc.nlnrc.nl

SHA-256 Fingerprint

06:F7:4F:A6:87:73:41:3F:24:B3:32:5C:47:FD:76:E4:BA:99:D9:B0...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Fri, 13 Feb 2026 22:27:06 GMT

feature-policy

camera 'none'; microphone 'none'; midi 'none'; geolocation '...

link

<https://assets.nrc.nl>; rel="preconnect", <https://images.n...

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

nrc-nl.mail.protection.outlook.com

Domain Information

nrc.nl

Domain Age

32 years

Created

09.02.1994

Last Updated

18.08.2022

Registrar

team.blue nl B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

Guardian Egyptian Web + LFT Etica

76/100

Readability

/30

40/40

16px · LH 1.45

Hierarchy

/20

11/25

1.38x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Guardian Egyptian Web

Sans22px

Body Font

LFT Etica

Sans16px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

22px

17px

19px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.45 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.nrc.nl(8)sdk.privacy-center.org(2)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

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Last analyzed: 13 Feb 2026 at 22:27

Historical Analysis & Change Tracking