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costco.co.kr

https://costco.co.kr· First analyzed 17 May 2026· Updated 17 May 2026
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costco.co.kr
Desktop screenshot of costco.co.kr
Mobile screenshot of costco.co.kr
Mobile

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Hosting Provider

Google Cloud Platform
cloud.google.com

IP Address

34.102.182.210

Site Location

🇰🇷 South Koreavia tld

Server Location

🇺🇸 Kansas City, United States

ASN

AS396982

Organization

Google Cloud

Server

Envoy

CDN

Akamai

WAF

Akamai

Nameservers

ns.ktnet.co.kr.snss.ktnet.co.kr.snsp.ktnet.co.kr.

Performance

97

Core Web Vitals

Weight

First Contentful Paint
956 ms10%
Speed Index
1.2 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2 MB
250 requests

Image Optimization

WebPAVIF
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Ghost

Technology Stack

5 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Frameworks

1
Angularv17.3.12

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

SEO Analysis

D50/100
15
8
2
Meta Tags5/15
Content3/12
Headings1/8
Technical19/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile3/4
Indexability3/3
C
costco.co.krcostco.co.kr

코스트코 온라인몰 | 코스트코 코리아

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Title Length20 chars

Recommended: 50-60 chars (~121px / 580px)

Description Length42 chars

Recommended: 120-160 chars

Issues (2)

  • • Very thin content (43 words). Search engines need substantial content for ranking.
  • • Missing H1 tag — every page should have exactly one H1

10 issues found

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Crawlability

Sitemap

Type: index

6 URLs

6 sub-sitemaps

robots.txt

14 rules

Sitemap reference found

Local SEO

Local Search Readiness

8/100
Poor
3 12 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F36/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
9/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:0%
Words:1,214
Token eff.:Optimal

Structured Data

1 JSON-LD

Citation Readiness

Opening Summary
Descriptive Headingsavg 2w
Canonical URL
Open Graph2/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
B
76/100
12
Passed
4
Critical
1
Warnings
Images & Alt Text
18/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 recommendations
  • •Accessibility recommendation preview...
Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
54/100
C
202 mg
CO₂e / view
2.0 MB
Page Weight
50%
Cleaner Than
New Visitor
231 mg
vs
Returning (cached)
116 mg
Annual (10K/mo)
24.3 kg
Emission Segments
Data Center
10 mg
Network
60 mg
Device
133 mg
Resource Breakdown
JavaScript
1.1 MB
Images
357.6 KB
CSS
292.0 KB
HTML
187.9 KB
Green Hosting Verified
Google Cloud
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
C

Security Score

61%Fair
Interactive

HTTPS

WAF

248d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

Valid From

20.01.2026

Valid Until

20.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

prod-sip.costco.co.ukwww.occ.costco.co.jpwww.costcowholesalefr.costco.frwww.costcowholesalees.costco.eswww.costco.sewww.costco.iswww.costco.frwww.costco.es+12 more

SHA-256 Fingerprint

F0:74:C9:01:3D:55:69:E4:3C:76:B3:43:64:5C:7C:11:92:68:2C:C3...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🟡 611s(max-age=611)
content-encoding
📦 Gzip(gzip)
content-security-policy
frame-ancestors 'self' https://*.costco.co.kr
content-type
text/html; charset=UTF-8
date
Sun, 17 May 2026 01:49:31 GMT
expires
Sun, 17 May 2026 01:59:42 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

55

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

Domain Information

costco.co.kr

DNSSEC
Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner
Cookiebot
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Cookiebot
Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
B
76/100
Mobile Friendly117 breakpoints
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Costco Sans

WCAG Partial
63/100
Readability
/30
18/30

14px · LH 1.40

Hierarchy
/20
10/20
WCAG
/25
19/25

1.9:1 min contrast

Performance
/25
16/25

1 font · 6 req

Heading Font

Costco Sans

Sans

Body Font

Costco Sans

Sans14px

Contrast Ratio

1.9:1

1 issue

Reading Comfort

~43 CPL

Narrow lines
16px
h3
14px
p

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.9:1).

✅ Lean font stack: 1 font families keeps load times fast.

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

Buy on MyFonts

Color Palette

9 unique colors
Light
#efefef
Background· 29.900000000000002%
#035fad
Primary· 10.8%
#908270
Secondary· 8.5%
#e5e1d7
Secondary· 6.8%
#cbc2b2
Secondary· 5.7%
#3b364c
Secondary· 5.2%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

1

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

16 Resources

10
Scripts
6
Styles
4
Async
4
Defer

Top Script Sources

googletagmanager.com(2)static.queue-it.net(2)costco.co.kr(1)assets.queue-it.net(1)polyfills-GTEVC5Y5.js(1)

Website Identity

costco.co.kr

webmanager@costcokr.com
Location detected: 🇰🇷 South Koreavia tld
ko

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Last analyzed: 17 May 2026 at 01:50

Historical Analysis & Change Tracking