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capnproto.org

https://capnproto.org· First analyzed 25 May 2026· Updated 25 May 2026
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capnproto.org
Desktop screenshot of capnproto.org
Mobile screenshot of capnproto.org
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.18.17.15

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

alex.ns.cloudflare.com.pam.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
485 ms10%
Speed Index
630 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
140 KB
11 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

1 Technologies Detected

CDN

1
Cloudflare

SEO Analysis

D49/100
14
9
2
Meta Tags4/15
Content11/12
Headings6/8
Technical10/25
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
C
capnproto.orgcapnproto.org

Cap'n Proto: Introduction

No description available for this page.

Title Length25 chars

Recommended: 50-60 chars (~146px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Most images missing alt text (4/4) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

2 rules

Local SEO

Local Search Readiness

2/100
Poor
1 14 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

D42/100
Bot Access
20/25
Machine Read.
16/25
Schema Data
0/25
Citation
6/25

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
code blocksheader/footer
Text ratio:61%
Words:979
Token eff.:Optimal
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary36w
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
AI readiness recommendation preview...
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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.
C
60/100
8
Passed
4
Critical
0
Warnings
Images & Alt Text
5/20
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
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
1/15
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.
78/100
A+
14 mg
CO₂e / view
139.9 KB
Page Weight
95%
Cleaner Than
New Visitor
16 mg
vs
Returning (cached)
8 mg
Annual (10K/mo)
1.7 kg
Emission Segments
Data Center
<0.001 g
Network
4 mg
Device
9 mg
Resource Breakdown
JavaScript
1.9 KB
Images
124.1 KB
CSS
9.6 KB
HTML
4.2 KB
Green Hosting Verified
Cloudflare
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

81%Very Good
Static / Informational

HTTPS

WAF

33d

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

29.03.2026

Valid Until

27.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

capnproto.org*.capnproto.org

SHA-256 Fingerprint

1F:E3:0E:F6:54:E9:20:64:7D:13:57:F4:63:0D:1A:09:B7:04:4D:91...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🟡 1 Hours(public, max-age=3600)
cf-cache-status
EXPIRED
cf-ray🇫🇷 Paris
a012a5367b9b7a32-CDG
content-encoding
📦 Gzip(gzip)
content-type
text/html;charset=utf-8
date
Mon, 25 May 2026 06:57:20 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

45

SPF
DKIM
DMARC

MX Records (3)

isaac.mx.cloudflare.net
linda.mx.cloudflare.net
amir.mx.cloudflare.net

Domain Information

capnproto.org

Domain Age
13y 1m

Created

03.04.2013

Expires

03.04.2031

Last Updated

09.03.2026

Registrar

Cloudflare, 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.
F
38/100
Not Mobile Friendly
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=480
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Lucida Grande + Myriad Pro

WCAG Partial
79/100
Readability
/30
27/30

16px · LH 1.50

Hierarchy
/20
19/20

2.25x ratio · ✓ H1→H6

WCAG
/25
17/25

1.35:1 min contrast

Performance
/25
16/25

2 fonts

Heading Font

Lucida Grande

Sans36px

Body Font

Myriad Pro

Sans16px

Contrast Ratio

1.35:1

16 issues

Reading Comfort

~46 CPL

Optimal (45–75)
36px
h1
16px
p

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~46 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 16 elements below WCAG AA threshold (min 1.4:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

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

Buy on MyFontsFlesch 53

Color Palette

7 unique colors
3.97:1 AA Large Light
#f2f2f2
Background· 34.8%
#80766d
Secondary· 2.9%
#c32728
Primary· 45.9%
#161010
Secondary· 8.5%
#ebe1aa
Accent· 4.2%
#611d1e
Accent· 2.3%
#8d2929
Accent· 1.4%

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

2 Resources

1
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

local(1)

Website Identity

capnproto.org

kenton@cloudflare.com
13 years old
Location detected: 🇨🇦 Canadavia ip
Cloudflare, Inc.

Social Profiles

X (Twitter)GitHub

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Last analyzed: 25 May 2026 at 06:57

Historical Analysis & Change Tracking