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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rvo.nl

https://rvo.nl· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

rvo.nl

Sponsored

Hosting Provider

HostingGuida

IP Address

93.92.102.21

Server Location

🇳🇱 The Hague, Netherlands

ASN

AS24586

Organization

HostingGuida

Nameservers

ns1.dictu.nl.ns2.dictu.nl.

Performance

Page Speed

2.8 MB

50 requests

Image Optimization

Lazy LoadResponsiveVercel Image Optimization

0–49

50–89

90–100

Architecture Stack

Hybrid

⚡ SSG

Frontend

Framework

Next.js

Infrastructure

Hosting

HostingGuida

CDN

Vercel Image

Technology Stack

3 Technologies Detected

Meta Frameworks

Next.js

CSS Frameworks

Tailwind CSS

Analytics

Matomo

SEO Analysis

B78/100

rvo.nlrvo.nl

Rijksdienst voor Ondernemend Nederland | RVO.nl

RVO is voor iedereen die werkt aan een duurzame, sterke economie. Wij helpen u graag vooruit. Met voorlichting, advies, financiering en de juiste contacten.

Title Length47 chars

Recommended: 50-60 chars

Description Length156 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (24/26)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

13,953 URLs

robots.txt

11 rules

Sitemap reference found

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

295d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Ireland Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

10.12.2025

Valid Until

09.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (6)

www.rvo.nlrvo.nlapplicaties.rvo.nlenglish.rvo.nlezine.rvo.nldata.rvo.nl

SHA-256 Fingerprint

98:BF:00:DA:A2:2F:72:D9:4B:8C:E5:5D:BF:A4:15:A5:04:91:16:89...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

⚪ Custom(s-maxage=31536000)

content-encoding

📦 Gzip(gzip)

content-security-policy

default-src 'self'; base-uri 'self'; script-src 'unsafe-inli...

content-type

text/html; charset=utf-8

date

Tue, 17 Feb 2026 06:17:50 GMT

etag

"myqz6lss2b35p4"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (4)

mail02.dictu.nl

mail03.dictu.nl

mail04.dictu.nl

mail01.dictu.nl

Domain Information

rvo.nl

Domain Age

20y 8m

Created

23.06.2005

Last Updated

04.10.2021

Registrar

Rijksoverheid

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

ROsans

83/100

Readability

/30

40/40

22px · LH 1.50

Hierarchy

/20

20/25

1.96x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

ROsans

Sans44px

Body Font

ROsans

Sans22px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

44px

30px

20px

22px

✅ Excellent readability: 22px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and 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

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(15)statistiek.rvo.nl(2)cloudstatic.obi4wan.com(1)

Website Identity

Facebook Instagram LinkedIn

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Last analyzed: 17 Feb 2026 at 06:18

Historical Analysis & Change Tracking