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

velog.io

https://velog.io· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

velog.io

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.209.136.7

Server Location

🇰🇷 Seoul, South Korea

ASN

AS16509

Organization

AWS EC2 (ap-northeast-2)

Nameservers

ns-1811.awsdns-34.co.uk.ns-221.awsdns-27.com.ns-947.awsdns-54.net.ns-1228.awsdns-25.org.

Performance

Page Speed

41 KB

122 requests

Image Optimization

Lazy LoadAVIF

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

7 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

CDN

SEO Analysis

D47/100

velog.iovelog.io

velog

개발자들을 위한 블로그 서비스. 어디서 글 쓸지 고민하지 말고 벨로그에서 시작하세요.

Title Length5 chars

Recommended: 50-60 chars

Description Length47 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

robots.txt

1 rules

Allows all crawlers

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

126d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.05.2025

Valid Until

21.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

velog.io*.velog.io

SHA-256 Fingerprint

A9:3F:A3:4B:24:B8:FF:02:1C:D9:22:34:E4:75:67:5B:C4:0F:29:FA...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

access-control-allow-methods

GET,DELETE,PATCH,POST,PUT

access-control-allow-origin

cache-control

⚪ Custom(s-maxage=10, stale-while-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

aspmx.daum.net

alt.aspmx.daum.net

Domain Information

velog.io

Domain Age

8y 2m

Created

01.12.2017

Expires

01.12.2026

Last Updated

06.11.2025

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

-apple-system

70/100

Readability

/30

32/40

14px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Body Font

-apple-system

Sans14px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

16px

14px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

⚠️ Cramped layout: 41 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.velcdn.com(7)googletagmanager.com(1)

Sponsored

Last analyzed: 15 Feb 2026 at 06:03

Historical Analysis & Change Tracking