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

fs.blog

https://fs.blog· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

fs.blog

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.66.43.25

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ajay.ns.cloudflare.com.zara.ns.cloudflare.com.

Performance

Page Speed

904 KB

64 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9.1

cms

FSBlogv2.0.0

by Rafal Tomal & BizBudding Inc.

View Theme

Technology Stack

17 Technologies Detected

Plugins

Convertkit Wp Bigfoot

Analytics

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Libraries

CSS Frameworks

Icon Libraries

Email Marketing

Popups & Forms

CDN

SEO Analysis

A82/100

fs.blogfs.blog

Think better. Decide better. Live better.

Timeless lessons on decision making, thinking, and continuous improvement. Written by Shane Parrish.hinking, and continuous improvement.

Title Length41 chars

Recommended: 50-60 chars

Description Length136 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

7 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

51%Poor

Interactive

HTTPS

WAF

36d

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

Valid From

26.12.2025

Valid Until

26.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

fs.blog*.fs.blog

SHA-256 Fingerprint

0C:55:32:F5:47:69:66:0C:4B:15:A9:6A:4F:A4:33:E4:86:47:E4:5B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

8749

cache-control

🟢 1 Month(max-age=16070400, must-revalidate)

cf-apo-via

tcache

cf-cache-status

HIT

cf-edge-cache

cache,platform=wordpress

cf-ray🇩🇪 Frankfurt

9cf927118ab4d22f-FRA

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (5)

alt1.aspmx.l.google.com

aspmx2.googlemail.com

alt2.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

fs.blog

Domain Age

8y 5m

Created

25.08.2017

Expires

25.08.2034

Last Updated

21.11.2025

Registrar

Automattic Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

sofia-pro + sans-serif

66/100

Readability

/30

25/40

30px · LH 0.75

Hierarchy

/20

18/25

2.17x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

sofia-pro

Sans64px

Body Font

sans-serif

Sans30px

Contrast Ratio

Reading Comfort

~43 CPL

Needs attention

64px

17px

24px

30px

✅ Excellent readability: 30px body text is ideal for all devices.

⚠️ Tight line spacing (0.75). Consider 1.4-1.6 for better readability.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

⚠️ Cramped layout: 30 elements lack adequate spacing.

AAdobe Fonts Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Marketing Automation

ConvertKitCreator

Email marketing and automation platforms

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

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Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

fs.blog(10)youtube.com(2)gstatic.com(1)secure.gaug.es(1)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 17 Feb 2026 at 23:44

Historical Analysis & Change Tracking