glfw.org

https://glfw.org· First analyzed 10 May 2026· Updated 10 May 2026

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glfw.org

Mobile

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Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.109.153

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns2.loopia.se.ns1.loopia.se.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

438 ms10%

Speed Index

569 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

35 KB

13 requests

0–49

50–89

90–100

Architecture Stack

JAMstack

⚡ SSG

Frontend

Framework

Jekyllv3.10.0

Infrastructure

Platform

GitHub Pages

CDN

Fastly

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

C63/100

Meta Tags5/15

Content11/12

Headings1/8

Technical20/25

E-E-A-T2/7

Images1/7

Links5/5

URL5/5

Social4/5

Freshness2/4

Mobile4/4

Indexability3/3

glfw.orgglfw.org

An OpenGL library | GLFW

GLFW project home page.

Title Length24 chars

Recommended: 50-60 chars (~153px / 580px)

Description Length23 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (8/8) — critical for accessibility and SEO

8 issues found

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Crawlability

Sitemap

Type: standard

2,369 URLs

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

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

D53/100

Bot Access

20/25

Machine Read.

13/25

Schema Data

5/25

Citation

15/25

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

navheader/footer

Text ratio:28%

Words:513

Token eff.:Optimal

Sections/1K:5.8

Depth:2/5

Structured Data

1 JSON-LD

Organization×1.1WebSite

Citation Readiness

Opening Summary32w

Descriptive Headingsavg 3w

Canonical URL

Open Graph2/3

Twitter Card1/3

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.

73/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

13/20

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.

2 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.

69/100

A+

4 mg

CO₂e / view

34.7 KB

Page Weight

95%

Cleaner Than

New Visitor

5 mg

Returning (cached)

3 mg

Annual (10K/mo)

516 g

Emission Segments

Data Center

1 mg

Network

1 mg

Device

2 mg

Resource Breakdown

JavaScript

893 B

Images

25.1 KB

CSS

5.2 KB

HTML

3.6 KB

Green Hosting Not Verified

GitHub Pages

2 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

73d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.04.2026

Valid Until

23.07.2026

Subject Alternative Names (2)

glfw.orgwww.glfw.org

SHA-256 Fingerprint

F1:68:15:59:30:E4:1D:8C:05:0D:63:4D:DF:46:BD:FF:5E:84:42:A5...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

3384

Good Warning Issue

Email Infrastructure

Proton Mail

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mail.protonmail.ch

mailsec.protonmail.ch

Domain Information

glfw.org

Domain Age

16y 7m

Created

13.10.2009

Expires

13.10.2026

Last Updated

03.09.2025

Registrar

Ascio Technologies, Inc. Danmark - Filial af Ascio technologies, Inc. USA

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.

56/100

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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

sans-serif

WCAG Partial

61/100

Readability

/30

23/30

16px · LH 1.80

Hierarchy

/20

8/20

WCAG

/25

16/25

1:1 min contrast

Performance

/25

14/25

0 fonts

Heading Font

sans-serif

Sans

Body Font

sans-serif

Sans16px

Contrast Ratio

1:1

13 issues

Reading Comfort

~35 CPL

Narrow lines

19px

14px

16px

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

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

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 1.0:1).

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

✅ Lean font stack: 0 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Flesch 40

Color Palette

6 unique colors

Light

#ffffff

Background· 78.30000000000001%

#f37c1b

Accent· 3.5%

#ff6600

Primary· 0%

#cac3bb

Secondary· 3.5%

#baa898

Secondary· 3.1%

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Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

GLFW

GLFW project home page.

www.glfw.org/

16 years old

Location detected: 🇺🇸 United Statesvia ip

Ascio Technologies, Inc. Danmark - Filial af Ascio technologies, Inc. USA📧 Proton Mailen

Social Profiles

GitHub

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Last analyzed: 10 May 2026 at 07:28

Historical Analysis & Change Tracking