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30secondsofcode.org

https://30secondsofcode.org· First analyzed 17 May 2026· Updated 17 May 2026
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30secondsofcode.org
Desktop screenshot of 30secondsofcode.org
Mobile screenshot of 30secondsofcode.org
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.21.88.134

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

michael.ns.cloudflare.com.elma.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
523 ms10%
Speed Index
680 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
447 KB
16 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

JAMstack
⚡ SSG
Frontend
Framework
Astro
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Meta Frameworks

1
Astro

CSS Frameworks

1
Tailwind CSS

CDN

1
Cloudflare

SEO Analysis

C65/100
21
7
2
Meta Tags7/15
Content8/12
Headings3/8
Technical20/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social4/5
Freshness2/4
Mobile4/4
Indexability3/3
3
30secondsofcode.org30secondsofcode.org

30 seconds of code

Browse 694 coding articles to level up your coding skills on 30 seconds of code.

Title Length18 chars

Recommended: 50-60 chars (~111px / 580px)

Description Length80 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (13/14) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

905 URLs

robots.txt

24 rules

Allows all crawlers

Local SEO

Local Search Readiness

4/100
Poor
1 15 2

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

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AI & LLM Readiness

D47/100
Bot Access
15/25
Machine Read.
11/25
Schema Data
2/25
Citation
19/25

AI Bot Access

6/14 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
navheader/footer
Text ratio:5%
Words:488
Token eff.:Optimal
Sections/1K:28.7
Depth:2/5

Structured Data

1 JSON-LD
WebSite

Citation Readiness

Opening Summary28w
Descriptive Headingsavg 7.7w
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (7)
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.
A
84/100
13
Passed
1
Critical
1
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
17/20
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
15/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
2/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •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.
90/100
A
45 mg
CO₂e / view
446.8 KB
Page Weight
90%
Cleaner Than
New Visitor
52 mg
vs
Returning (cached)
26 mg
Annual (10K/mo)
5.4 kg
Emission Segments
Data Center
2 mg
Network
13 mg
Device
30 mg
Resource Breakdown
JavaScript
3.5 KB
Images
335.5 KB
CSS
709 B
Fonts
92.6 KB
HTML
14.5 KB
Green Hosting Verified
Cloudflare
GWF Verified
1 recommendation
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

88%Very Good
Static / Informational

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+H3

Valid From

20.04.2026

Valid Until

20.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.30secondsofcode.org

SHA-256 Fingerprint

AA:BA:31:B9:D6:B3:51:61:16:21:E8:7F:A5:BA:76:E1:8E:DE:75:A3...

Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-origin
*
alt-svc
h3=":443"; ma=86400
cache-control
🟡 0s(public, max-age=0, must-revalidate)
cf-cache-status
DYNAMIC
cf-ray🇫🇷 Paris
9fd01f2959df343a-CDG
content-encoding
⚡ Brotli(br)
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

30secondsofcode.org

Domain Age
8y 4m

Created

21.12.2017

Expires

21.12.2030

Last Updated

02.07.2025

Registrar

NameCheap, Inc.

DNSSEC
Not Enabled

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.
A
88/100
Mobile Friendly15 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

Typography & Readability

Inter

WCAG Partial
69/100
Readability
/30
22/30

16px · LH 1.75

Hierarchy
/20
16/20

2.25x ratio

WCAG
/25
16/25

1.28:1 min contrast

Performance
/25
15/25

1 font · 2 req

Heading Font

Inter

Sans36px

Body Font

Inter

Sans16px

Contrast Ratio

1.28:1

42 issues

Reading Comfort

~33 CPL

Narrow lines
36px
h1
32px
h2
26px
h3
16px
p

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

⚠️ Hard to read: Flesch score 47/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 42 elements below WCAG AA threshold (min 1.3:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

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

⚠️ Fluid type without rem: clamp() detected but missing rem units. May fail WCAG 1.4.4 zoom test.

Buy on MyFontsFluid TypeFlesch 47

Color Palette

7 unique colors
3.89:1 AA Large Light
#c7c3c5
Other· 3.9%
#575b66
Secondary· 2.6%
#07081d
Primary· 77.69999999999999%
#171732
Primary· 8%
#463338
Secondary· 2.4%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

3 Resources

2
Scripts
1
Styles
0
Async
1
Defer

Top Script Sources

local(1)static.cloudflareinsights.com(1)

Website Identity

30secondsofcode.org

8 years old
Location detected: 🇨🇦 Canadavia ip
NameCheap, Inc.en

Social Profiles

GitHub

Sponsored

Last analyzed: 17 May 2026 at 05:11

Historical Analysis & Change Tracking