underscorejs.org

https://underscorejs.org· First analyzed 29 Apr 2026· Updated 29 Apr 2026

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underscorejs.org

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.21.25.112

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

robin.ns.cloudflare.com.logan.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

558 ms10%

Speed Index

725 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

77 KB

8 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Platform

GitHub Pages

CDN

Cloudflare

Technology Stack

2 Technologies Detected

Libraries

Underscore.js

CDN

Cloudflare

SEO Analysis

D51/100

Meta Tags4/15

Content12/12

Headings3/8

Technical12/21

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile3/4

Indexability3/3

underscorejs.orgunderscorejs.org

Underscore.js

No description available for this page.

Title Length13 chars

Recommended: 50-60 chars (~78px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1

11 issues found

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Local SEO

Local Search Readiness

0/100

Poor

15 2

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

Sponsored

AI & LLM Readiness

F32/100

Bot Access

20/25

Machine Read.

4/25

Schema Data

0/25

Citation

8/25

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 blocks

Text ratio:50%

Words:14,022

Token eff.:Excessive

Sections/1K:0.8

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary61w

Descriptive Headingsavg 3w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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.

64/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

4/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

4 recommendations

•Accessibility recommendation preview...

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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.

70/100

A+

8 mg

CO₂e / view

76.9 KB

Page Weight

95%

Cleaner Than

New Visitor

9 mg

Returning (cached)

4 mg

Annual (10K/mo)

936 g

Emission Segments

Data Center

<0.001 g

Network

2 mg

Device

5 mg

Resource Breakdown

JavaScript

21.8 KB

Images

8.7 KB

CSS

2.4 KB

HTML

44.0 KB

Green Hosting Verified

Cloudflare

GWF Verified

2 recommendations

•Carbon footprint recommendation preview...

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Security Score

26%Critical

Interactive

HTTPS

WAF

39d

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

10.03.2026

Valid Until

08.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

underscorejs.org*.underscorejs.org

SHA-256 Fingerprint

BA:BA:C1:D2:6B:E5:72:1A:DF:E6:49:D0:0F:2A:2F:13:E4:6C:60:30...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

age

alt-svc

h3=":443"; ma=86400

cache-control

🟡 600s(max-age=600)

cf-cache-status

DYNAMIC

cf-ray

9f40cae428084d0c-BOS

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

underscorejs.org

Domain Age

14y 3m

Created

05.01.2012

Expires

05.01.2027

Last Updated

11.12.2025

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.

58/100

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=1.0

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica Neue

WCAG AAA

74/100

Readability

/30

25/30

14px · LH 1.57

Hierarchy

/20

8/20

WCAG

/25

21/25

21:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

21:1

WCAG AAA (≥7:1)

Reading Comfort

~71 CPL

Optimal (45–75)

20px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.57 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~71 chars/line (ideal 45–75 CPL).

⚠️ Hard to read: Flesch score 49/100. Simplify sentences for wider reach.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 21.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

Flesch 49

Color Palette

3 unique colors

2.62:1 Fail Light

#f9f9f9

Background· 86.1%

#999c9f

Other· 8.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

underscore-umd.js(1)docs(1)static.cloudflareinsights.com(1)

Website Identity