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preactjs.com

https://preactjs.com· First analyzed 06 May 2026· Updated 06 May 2026
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preactjs.com
Desktop screenshot of preactjs.com
Mobile screenshot of preactjs.com
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.21.61.148

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

rick.ns.cloudflare.com.kara.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
490 ms10%
Speed Index
637 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
69 KB
15 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Platform
Netlify
CDN
Cloudflare

Technology Stack

4 Technologies Detected

Frameworks

1
Preact

CSS Frameworks

1
Tailwind CSS

Analytics

1
Google Analytics

CDN

1
Cloudflare

SEO Analysis

D57/100
16
8
1
Meta Tags5/15
Content10/12
Headings3/8
Technical13/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
P
preactjs.compreactjs.com

Preact

Fast 3kB alternative to React with the same modern API

Title Length6 chars

Recommended: 50-60 chars (~37px / 580px)

Description Length54 chars

Recommended: 120-160 chars

Issues (1)

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

9 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

3/100
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

D53/100
Bot Access
20/25
Machine Read.
21/25
Schema Data
0/25
Citation
12/25

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.txtvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
code blocksnavheader/footer
Text ratio:12%
Words:1,095
Token eff.:Optimal
Sections/1K:11.9
Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary21w
Descriptive Headingsavg 2.8w
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
AI readiness recommendation preview...
Upgrade to view recommendations

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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.
B
75/100
11
Passed
1
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
7/15
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
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 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.
84/100
A+
7 mg
CO₂e / view
69.2 KB
Page Weight
95%
Cleaner Than
New Visitor
8 mg
vs
Returning (cached)
4 mg
Annual (10K/mo)
840 g
Emission Segments
Data Center
<0.001 g
Network
2 mg
Device
5 mg
Resource Breakdown
JavaScript
25.8 KB
Images
5.1 KB
CSS
9.4 KB
HTML
11.3 KB
Other
17.6 KB
Green Hosting Verified
Cloudflare
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

26%Critical
Interactive

HTTPS

WAF

56d

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

03.04.2026

Valid Until

02.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

preactjs.com*.preactjs.com

SHA-256 Fingerprint

9C:BE:88:2E:5B:7D:A4:EF:08:19:B7:4F:83:97:75:24:10:E5:89:53...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

age
17638
alt-svc
h3=":443"; ma=86400
cache-control
🟡 0s(public,max-age=0,must-revalidate)
cache-status
"Netlify Edge"; hit
cf-cache-status
DYNAMIC
cf-ray🇮🇹 Milan
9f75d42fdc7cee19-MXP
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

65

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

route1.mx.cloudflare.net
route2.mx.cloudflare.net
route3.mx.cloudflare.net

Domain Information

preactjs.com

Domain Age
10y 1m

Created

31.03.2016

Expires

31.03.2027

Last Updated

30.03.2026

Registrar

Porkbun LLC

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

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.
C
67/100
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=device-width, initial-scale=1.0, minimal-ui
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Segoe UI

WCAG Partial
77/100
Readability
/30
25/30

16px · LH 1.65

Hierarchy
/20
18/20

3x ratio · ✓ H1→H6

WCAG
/25
12/25

1:1 min contrast

Performance
/25
22/25

System fonts

Heading Font

Segoe UI

Sans48px

Body Font

Segoe UI

Sans16px

Contrast Ratio

1:1

2 issues

Reading Comfort

~38 CPL

Narrow lines
48px
h1
64px
h2
35px
h3
16px
p

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

⚠️ Hard to read: Flesch score 40/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

Flesch 41

Color Palette

5 unique colors
Light
#673bb7
Primary· 70.10000000000001%
#101825
Secondary· 14.3%
#f3f1f6
Secondary· 6.6%
#3f2768
Secondary· 6.3%
#7554aa
Secondary· 2.7%

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
1
Async
1
Defer

Top Script Sources

local(1)google-analytics.com(1)

Website Identity

preactjs.com

10 years old
Location detected: 🇨🇦 Canadavia ip
Porkbun LLCen

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Last analyzed: 06 May 2026 at 06:11

Historical Analysis & Change Tracking