ctftime.org

https://ctftime.org· First analyzed 29 Apr 2026· Updated 29 Apr 2026

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ctftime.org

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

188.114.97.3

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

CloudFlare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

rick.ns.cloudflare.com.june.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.0 s10%

Speed Index

1.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

258 KB

72 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

7 Technologies Detected

CSS Frameworks

Bootstrap

Tailwind CSS

Advertising

Google Ads Google AdSense

Libraries

jQuery

Analytics

Google Analytics

CDN

Cloudflare

SEO Analysis

C61/100

Meta Tags10/15

Content11/12

Headings3/8

Technical13/25

E-E-A-T3/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

ctftime.orgctftime.org

CTFtime.org / All about CTF (Capture The Flag)

Capture The Flag, CTF teams, CTF ratings, CTF archive, CTF writeups

Title Length46 chars

Recommended: 50-60 chars (~277px / 580px)

Description Length67 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

9 issues found

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Crawlability

Sitemap

robots.txt

23 rules

Local SEO

Local Search Readiness

7/100

Poor

2 14 2

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

Sponsored

AI & LLM Readiness

F38/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

0/25

Citation

10/25

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:11%

Words:1,278

Token eff.:Optimal

Sections/1K:9.4

Structured Data

No Schema

Citation Readiness

Opening Summary12w

Descriptive Headingsavg 2.1w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

AI readiness recommendation preview...

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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.

74/100

Passed

Critical

Warnings

Images & Alt Text

15/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

9/20

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

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

11/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•Accessibility recommendation preview...

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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.

55/100

A+

26 mg

CO₂e / view

258.2 KB

Page Weight

95%

Cleaner Than

New Visitor

30 mg

Returning (cached)

15 mg

Annual (10K/mo)

3.1 kg

Emission Segments

Data Center

1 mg

Network

8 mg

Device

17 mg

Resource Breakdown

JavaScript

141.7 KB

Images

55.3 KB

CSS

41.0 KB

HTML

9.6 KB

Other

10.6 KB

Green Hosting Verified

Cloudflare

GWF Verified

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

61%Fair

Interactive

HTTPS

WAF

63d

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

03.04.2026

Valid Until

02.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

ctftime.org*.ctftime.org

SHA-256 Fingerprint

3C:E6:60:E7:6F:60:19:44:14:C5:94:C8:D7:D2:0C:9B:D1:58:CF:BA...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cf-cache-status

DYNAMIC

cf-ray

9f42068cfbc86bb4-SJC

content-encoding

zstd

content-language

en-gb

content-type

text/html; charset=utf-8

date

Wed, 29 Apr 2026 23:18:25 GMT

Good Warning Issue

Email Infrastructure

Yandex Mail

Score

SPF

DKIM

DMARC

MX Records (1)

mx.yandex.ru

Domain Information

ctftime.org

Domain Age

14 years

Created

19.04.2012

Expires

19.04.2027

Last Updated

25.03.2026

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

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.

57/100

Mobile Friendly1 breakpoint

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=1.0

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica Neue

WCAG Partial

62/100

Readability

/30

17/30

13px · LH 1.38

Hierarchy

/20

8/20

WCAG

/25

17/25

2.85:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans13px

Contrast Ratio

2.85:1

40 issues

Reading Comfort

~47 CPL

Optimal (45–75)

24px

18px

13px

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Tight line spacing (1.38). Increase to 1.4–1.6 for better readability.

✅ Optimal line length: ~47 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 40 elements below WCAG AA threshold (min 2.9:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 62

Color Palette

5 unique colors

Light

#ffffff

Background· 76.1%

#200001

Primary· 6%

#d0dde1

Secondary· 4.6%

#976869

Secondary· 4.2%

Business & Marketing Stack

3 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)ssl.google-analytics.com(1)mc.yandex.ru(1)gstatic.com(1)google.com(1)

Website Identity

ctftime.org

14 years old

Location detected: 🇨🇦 Canadavia ip

Cloudflare, Inc.📧 Yandex Mailen

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 29 Apr 2026 at 23:18

Historical Analysis & Change Tracking