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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languagetool.org

https://languagetool.org· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

languagetool.org

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.18.36.57

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

adrian.ns.cloudflare.com.chris.ns.cloudflare.com.

Performance

Page Speed

1.1 MB

105 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Medium

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

16 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Amplitude Matomo FullStory

Advertising

Google Ads TikTok Pixel Microsoft Advertising Taboola

Payments

Frameworks

CSS Frameworks

Tag Managers

Customer Support

CDN

SEO Analysis

A+90/100

languagetool.orglanguagetool.org

Free AI Grammar Checker - LanguageTool

Instantly check grammar, punctuation, and spelling errors with LanguageTool's AI-powered grammar checker. Enhance your writing in over 30 languages with ease.

Title Length38 chars

Recommended: 50-60 chars

Description Length158 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

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Crawlability

Sitemap

Type: standard

robots.txt

15 rules

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

WAF

61d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

22.01.2026

Valid Until

22.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

languagetool.org*.languagetool.org

SHA-256 Fingerprint

6E:79:D1:78:69:73:09:86:82:B1:1A:35:AA:C5:F9:29:DC:B8:C5:D1...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(no-cache, private)

cf-cache-status

BYPASS

cf-ray🇩🇪 Frankfurt

9d07ef249902d9ce-FRA

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (3)

mxext2.mailbox.org

mxext3.mailbox.org

mxext1.mailbox.org

Domain Information

languagetool.org

Domain Age

19y 3m

Created

22.11.2006

Expires

22.11.2026

Last Updated

06.01.2026

Registrar

Vautron Rechenzentrum AG

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

LanguageTool-win + sans-serif

62/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

2.13x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

LanguageTool-win

Sans32px

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

32px

20px

16px

24px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.1x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

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

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(3)languagetool.org(3)consent.cookiebot.eu(2)local(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn GitHub TikTok

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Last analyzed: 19 Feb 2026 at 18:47

Historical Analysis & Change Tracking