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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flathub.org

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

Export

flathub.org

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.61.91

Server Location

🇬🇧 City of London, United Kingdom

ASN

AS54113

Organization

Fastly, Inc.

Server

OpenResty

CDN

Fastly

Nameservers

ns1.mythic-beasts.com.ns2.mythic-beasts.com.

Performance

Page Speed

795 KB

124 requests

Image Optimization

Lazy LoadWebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Styling

Tailwind CSS

Infrastructure

Hosting

Fastly, Inc.

CDN

Fastly

Technology Stack

8 Technologies Detected

Analytics

Plausible Analytics Matomo Plausible

Meta Frameworks

Frameworks

CSS Frameworks

Web Servers

SEO Analysis

B72/100

flathub.orgflathub.org

Flathub - Apps for Linux

Find and install hundreds of apps and games for Linux. Enjoy Firefox, Telegram, RetroArch, GIMP and many more!

Title Length24 chars

Recommended: 50-60 chars

Description Length110 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

1 rules

Allows all crawlers

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

No WAF

371d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

25.01.2026

Valid Until

26.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (1)

flathub.org

SHA-256 Fingerprint

8C:87:6F:A7:3A:40:1E:95:39:30:FB:97:96:AF:7B:48:C3:A8:1E:35...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

2993

alt-svc

h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=864...

cache-control

⚪ Custom(s-maxage=3600, stale-while-revalidate=31532400)

content-encoding

⚡ Brotli(br)

content-length

124560

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mx1.mythic-beasts.com

mx2.mythic-beasts.com

Domain Information

flathub.org

Domain Age

9y 4m

Created

27.09.2016

Expires

27.09.2028

Last Updated

03.06.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Inter + sans-serif

83/100

Readability

/30

40/40

16px · LH 1.75

Hierarchy

/20

20/25

1.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Inter

Sans24px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~32 CPL

Needs attention

24px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.75 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and 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

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

dl.flathub.org(15)webstats.gnome.org(1)

Website Identity

GitHub

Sponsored

Last analyzed: 19 Feb 2026 at 21:05

Historical Analysis & Change Tracking