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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threadreaderapp.com

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

Export

threadreaderapp.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

188.114.96.3

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

CloudFlare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jeremy.ns.cloudflare.com.elma.ns.cloudflare.com.

Performance

Page Speed

451 KB

46 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

CMS

Substack

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

13 Technologies Detected

Advertising

Google Ads Google AdSense Criteo Outbrain

CSS Frameworks

Bootstrapv4.2.1

Tailwind CSS

Icon Libraries

Font Awesome Material Icons

Payments

Fonts

Analytics

CDN

SEO Analysis

C64/100

threadreaderapp.comthreadreaderapp.com

Home – Thread Reader App

Thread Reader helps you discover and read the best of Twitter Threads

Title Length24 chars

Recommended: 50-60 chars

Description Length69 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

18 rules

Sitemap reference found

Sponsored

Security Score

5%Critical

Critical / Transactional

HTTPS

WAF

85d

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

12.02.2026

Valid Until

13.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

threadreaderapp.comthreadshots1.threadreaderapp.com

SHA-256 Fingerprint

73:CD:F6:49:1A:65:1E:45:26:BB:C3:5D:50:B7:A8:E4:E1:A7:ED:46...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

1339

alt-svc

h3=":443"; ma=86400

cache-control

🟡 1 Hours(max-age=3600, public, s-maxage=3600)

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9cf18ecb4c6730c3-FRA

content-encoding

zstd

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

linda.mx.cloudflare.net

isaac.mx.cloudflare.net

amir.mx.cloudflare.net

Domain Information

threadreaderapp.com

Domain Age

8y 3m

Created

13.11.2017

Expires

13.11.2026

Last Updated

14.10.2025

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Legitimate interest basis mentioned

Typography & Readability

Lato + Lucida Grande

60/100

Readability

/30

22/40

14px · LH --

Hierarchy

/20

20/25

1.83x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Lato

Sans26px

Body Font

Lucida Grande

Sans14px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

26px

20px

28px

18px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 15 elements lack adequate spacing.

GGoogle Fonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

pagead2.googlesyndication.com(2)fundingchoicesmessages.google.com(2)platform.twitter.com(2)google-analytics.com(1)local(1)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 17 Feb 2026 at 01:37

Historical Analysis & Change Tracking