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sheetjs.com

https://sheetjs.com· First analyzed 25 May 2026· Updated 25 May 2026
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sheetjs.com
Desktop screenshot of sheetjs.com
Mobile screenshot of sheetjs.com
Mobile

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Hosting Provider

cloudflare.com

IP Address

172.67.172.85

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ivy.ns.cloudflare.com.frank.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

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

Architecture Stack

Hybrid
SSG
Frontend
Framework
Gatsby
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

SEO Analysis

D56/100
17
8
1
Meta Tags5/15
Content3/12
Headings0/8
Technical20/25
E-E-A-T5/7
Images4/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile1/4
Indexability3/3
S
sheetjs.comsheetjs.com

SheetJS - Home

SheetJS Tools for Excel Spreadsheets

Title Length14 chars

Recommended: 50-60 chars (~89px / 580px)

Description Length36 chars

Recommended: 120-160 chars

Issues (1)

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

Crawlability

Sitemap
robots.txt

21 rules

Local SEO

Local Search Readiness

7/100
Poor
2 14 1

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

F29/100
Bot Access
15/25
Machine Read.
1/25
Schema Data
2/25
Citation
11/25

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
Text ratio:5%
Words:85
Token eff.:Too Short

Structured Data

1 JSON-LD
Organization×1.1

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph3/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
AI readiness recommendation preview...

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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
69/100
9
Passed
4
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
6/20
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
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • Accessibility recommendation preview...

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+
<0.001 g
CO₂e / view
5.7 KB
Page Weight
95%
Cleaner Than
New Visitor
<0.001 g
vs
Returning (cached)
<0.001 g
Annual (10K/mo)
72 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
<0.001 g
Resource Breakdown
JavaScript
900 B
Images
600 B
HTML
4.2 KB
Green Hosting Verified
Cloudflare
GWF Verified
2 recommendations
  • Carbon footprint recommendation preview...
B

Security Score

78%Good
Static / Informational

HTTPS

WAF

53d

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

18.04.2026

Valid Until

17.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

sheetjs.com

SHA-256 Fingerprint

C9:9F:65:30:B3:34:8A:8C:1F:EE:73:EC:5B:CC:58:B8:41:D9:D0:E6...

Recommendations

Security recommendation preview

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
a0118005ee08ea58-FCO
content-encoding
Brotli(br)
Good Warning Issue

Email Infrastructure

Zoho Mail

Score

45

SPF
DKIM
DMARC

MX Records (3)

mx2.zoho.com
mx3.zoho.com
mx.zoho.com

Domain Information

sheetjs.com

Domain Age
13 years

Created

05.05.2013

Expires

05.05.2027

Last Updated

05.04.2026

Registrar

Cloudflare, Inc.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

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
69/100
Mobile Friendly2 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, shrink-to-fit=no
2 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

-apple-system

WCAG AAA
72/100
Readability
/30
19/30

16px · LH --

Hierarchy
/20
9/20
WCAG
/25
24/25

10.74:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

-apple-system

Body Font

-apple-system

Sans16px

Contrast Ratio

10.74:1

WCAG AAA (≥7:1)

Reading Comfort

Single Family

center aligned

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

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 10.7:1).

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

Flesch 0

Color Palette

8 unique colors
3.8:1 AA Large Light
#ffffff
Primary· 91.30000000000003%
#828383
Other· 1.1%
#dcf2f5
Accent· 1.9000000000000001%
#9ad1bb
Secondary· 1.1%
#bbeee1
Accent· 0.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1

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

6 Resources

6
Scripts
0
Styles
4
Async
2
Defer

Top Script Sources

local(3)static.cloudflareinsights.com(2)googletagmanager.com(1)

Website Identity

sheetjs.com

13 years old
Location detected: 🇨🇦 Canadavia ip
Cloudflare, Inc.📧 Zoho Mailen-US

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Last analyzed: 25 May 2026 at 03:37

Historical Analysis & Change Tracking