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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nexusmods.com

https://nexusmods.com· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

nexusmods.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.18.42.54

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

karl.ns.cloudflare.com.alla.ns.cloudflare.com.

Performance

Page Speed

866 KB

112 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

JAMstack

🔀 Hybrid

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch Icon

Detected API Sources

/api/scripts/ad_skyscraper.js

Technology Stack

6 Technologies Detected

Meta Frameworks

Libraries

CSS Frameworks

Analytics

Advertising

CDN

SEO Analysis

C62/100

nexusmods.comnexusmods.com

Nexus Mods - Mods and Community - Nexus Mods

We host 811,451 mods for 4,343 games from 175,234 authors serving 71,064,819 members with 21,248,706,170 downloads to date. We've donated $15,721,643 to our ...

Description truncated.

Title Length44 chars

Recommended: 50-60 chars

Description Length200 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (25/38)

3 issues found

Upgrade to view details

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

WAF

76d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

30.01.2026

Valid Until

30.04.2026

Subject Alternative Names (3)

*.cluster.nexusmods.com*.nexusmods.comnexusmods.com

SHA-256 Fingerprint

3D:04:ED:FF:7A:4D:2D:18:F4:48:CA:35:3F:D1:DC:25:1D:F3:A0:D2...

Upgrade to view header details

HTTP Headers

Developer Console

date

Fri, 13 Feb 2026 15:57:01 GMT

content-type

text/html; charset=utf-8

content-encoding

⚡ Brotli(br)

set-cookie

fwroute

x-frame-options

SAMEORIGIN

x-content-type-options

nosniff

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt2.aspmx.l.google.com

alt3.aspmx.l.google.com

alt4.aspmx.l.google.com

alt1.aspmx.l.google.com

+1 more

Domain Information

nexusmods.com

Domain Age

14y 10m

Created

14.04.2011

Expires

14.04.2029

Last Updated

07.12.2025

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

ui-sans-serif

88/100

Readability

/30

40/40

18px · LH 1.50

Hierarchy

/20

25/25

3.33x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

ui-sans-serif

Sans60px

Body Font

ui-sans-serif

Sans18px

Contrast Ratio

Reading Comfort

~59 CPL

Optimal (45–75)

60px

36px

24px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.3x 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.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Reddit PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(16)assets.bounceexchange.com(2)redditstatic.com(1)tag.wknd.ai(1)

Website Identity

X (Twitter)Instagram TikTok Discord

Sponsored

Last analyzed: 13 Feb 2026 at 15:57

Historical Analysis & Change Tracking