StackOptic
Back to Search
clrn.org favicon

clrn.org

https://clrn.org· First analyzed 19 May 2026· Updated 19 May 2026
Export
clrn.org
Desktop screenshot of clrn.org
Mobile screenshot of clrn.org
Mobile

Sponsored

Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.16.150.108

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

dion.ns.cloudflare.com.rita.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
551 ms10%
Speed Index
716 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
47 requests

Image Optimization

WebP
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.9.4
cms
Astrav4.13.2
by Brainstorm Force
View Theme

Technology Stack

15 Technologies Detected

Advertising

4
Google AdsGoogle AdSenseCriteoOutbrain

Plugins

4
Universal Star Rating
WooCommerce
Yoast SEO
Elementor

Libraries

1
jQueryv3.7.1

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Material Icons

Fonts

1
Google Fonts

Analytics

1
Google Analytics

Payments

1
Square

CDN

1
Cloudflare

SEO Analysis

B74/100
19
9
1
Meta Tags10/15
Content10/12
Headings5/8
Technical24/25
E-E-A-T2/7
Images2/7
Links2/5
URL5/5
Social4/5
Freshness4/4
Mobile3/4
Indexability3/3
C
clrn.orgclrn.org

California Learning Resources Network

California Learning Resource Network CLRN provides educators with access to reviewed electronic learning resources aligned with California s academic standar...

Description truncated.
Title Length37 chars

Recommended: 50-60 chars (~223px / 580px)

Description Length237 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (17/19) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

67 URLs

67 sub-sitemaps

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

18/100
Poor
5 12

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

Sponsored

AI & LLM Readiness

D50/100
Bot Access
20/25
Machine Read.
5/25
Schema Data
8/25
Citation
17/25

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.txtinvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:10%
Words:8,919
Token eff.:Excessive

Structured Data

5 JSON-LD
Organization×1.1WebSiteBreadcrumbListSearchAction
sameAs entity links

Citation Readiness

Opening Summary39w
Descriptive Headingsavg 7.1w
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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
86/100
12
Passed
2
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
15/20
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
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

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.
63/100
B
138 mg
CO₂e / view
1.3 MB
Page Weight
70%
Cleaner Than
New Visitor
157 mg
vs
Returning (cached)
79 mg
Annual (10K/mo)
16.5 kg
Emission Segments
Data Center
7 mg
Network
41 mg
Device
91 mg
Resource Breakdown
JavaScript
433.5 KB
Images
840.5 KB
CSS
56.1 KB
Fonts
6.2 KB
HTML
27.2 KB
Green Hosting Verified
Cloudflare
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

0%Critical
Critical / Transactional

HTTPS

WAF

60d

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

19.04.2026

Valid Until

18.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.clrn.org

SHA-256 Fingerprint

FB:62:7C:5B:66:09:67:D7:23:18:F0:31:14:13:FD:E0:0F:45:4D:D7...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

age
258703
alt-svc
h3=":443"; ma=86400
cache-control
🟡 0s(public, max-age=0, s-maxage=2592000)
cf-cache-status
HIT
cf-ray🇫🇷 Paris
9fdf1a92bbbfd0b7-CDG
content-encoding
zstd
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

clrn.org

Domain Age
26y 8m

Created

16.09.1999

Expires

16.09.2026

Last Updated

31.10.2025

Registrar

NameSilo, LLC

DNSSEC
Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner
Quantcast Choice
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Quantcast Choice
Privacy policy page linked
Legitimate interest basis mentioned

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
79/100
Mobile Friendly103 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

Open Sans + -apple-system

WCAG Partial
74/100
Readability
/30
24/30

16px · LH 1.65

Hierarchy
/20
9/20

1.09x ratio

WCAG
/25
19/25

3.98:1 min contrast

Performance
/25
22/25

System fonts

Heading Font

Open Sans

Sans18px

Body Font

-apple-system

Sans16px

Contrast Ratio

3.98:1

1 issue

Reading Comfort

~38 CPL

Narrow lines
18px
h1
32px
h2
24px
h3
16px
p
Minor Second
Scale

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

⚠️ Hard to read: Flesch score 34/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 4.0:1).

❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

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

GGoogle FontsFlesch 34

Color Palette

8 unique colors
5.74:1 AA Dark
#666666
Other· 60.6%
#ffffff
Background· 19.1%
#141f24
Primary· 5%
#58677d
Secondary· 1.2%
#838d9b
Secondary· 1.1%

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

Advertising

1
Google AdsEnterprise

Ad platforms and retargeting pixels

2

Categories

2

Total Tools

1

Enterprise

0

Mid-Market

Assessment: Well-developed marketing technology stack

Ad Networks

Google AdSenseMedia.netSovrnPubMaticOpenXIndex Exchange

Sponsored

Scripts & Styles

18 Resources

12
Scripts
6
Styles
6
Async
0
Defer

Top Script Sources

pagead2.googlesyndication.com(5)clrn.org(4)fundingchoicesmessages.google.com(2)googletagmanager.com(1)

Website Identity

California Learning Resources Network

California Learning Resources Network

Organization

California Learning Resource Network CLRN provides educators with access to reviewed electronic learning resources aligned with California s academic standards Explore software, videos, and tools to support digital learning in classrooms

www.clrn.org/
26 years old
Location detected: 🇨🇦 Canadavia ip
NameSilo, LLCen-US

Sponsored

Last analyzed: 19 May 2026 at 00:50

Historical Analysis & Change Tracking