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

xnview.com

https://xnview.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

xnview.com

Sponsored

Hosting Provider

Free SAS

IP Address

212.83.169.215

Server Location

🇫🇷 Paris, France

ASN

AS12876

Organization

Free SAS

Server

Apache

Nameservers

ns.ovh.net.dns.ovh.net.

Performance

Page Speed

1.4 MB

40 requests

Image Optimization

WebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

Infrastructure

Hosting

Free SAS

Technology Stack

8 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Matomo

Advertising

Google Ads Google AdSense

CSS Frameworks

Tailwind CSS

Icon Libraries

Font Awesome

Web Servers

Apachev2.4.66

SEO Analysis

A80/100

xnview.comxnview.com

Image Viewer | Photo Viewer | Image Resize | XnView

XnView, one of the best and popular image viewer

Title Length51 chars

Recommended: 50-60 chars

Description Length48 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

48 URLs

robots.txt

4 rules

Allows all crawlers

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

67d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

26.01.2026

Valid Until

26.04.2026

Subject Alternative Names (19)

wiki.xnview.comwww.xnconvert.comwww.xnview.bewww.xnview.bizwww.xnview.comwww.xnview.euwww.xnview.frwww.xnview.info+11 more

SHA-256 Fingerprint

F2:51:5F:BE:21:6B:06:42:8D:AB:18:C9:CE:B3:9A:D3:53:48:4B:76...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 2 Hours(max-age=7200)

content-encoding

📦 Gzip(gzip)

content-length

6507

content-type

text/html; charset=UTF-8

date

Tue, 17 Feb 2026 14:27:01 GMT

expires

Tue, 17 Feb 2026 16:27:01 GMT

Good Warning Issue

Email Infrastructure

OVH Email

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

mx1.mail.ovh.net

mx4.mail.ovh.net

mx2.mail.ovh.net

mx3.mail.ovh.net

+1 more

Domain Information

xnview.com

Domain Age

25y 9m

Created

02.05.2000

Expires

02.05.2026

Last Updated

03.05.2025

Registrar

OVH sas

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Helvetica Neue

64/100

Readability

/30

32/40

32px · LH 1.25

Hierarchy

/20

11/25

1x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Helvetica Neue

Sans32px

Body Font

Helvetica Neue

Sans32px

Contrast Ratio

Reading Comfort

~43 CPL

Needs attention

32px

34px

28px

32px

✅ Excellent readability: 32px body text is ideal for all devices.

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

✅ 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.

✅ Protected text on images: Using text-shadow for readability.

GGoogle Fonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

xnview.com(3)matomo.xnview.com(1)pagead2.googlesyndication.com(1)cdn.jsdelivr.net(1)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 17 Feb 2026 at 14:27

Historical Analysis & Change Tracking