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sdss.org

https://sdss.org· First analyzed 28 Apr 2026· Updated 28 Apr 2026
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sdss.org
Desktop screenshot of sdss.org
Mobile screenshot of sdss.org
Mobile

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Hosting Provider

Pantheon
pantheon.io

IP Address

23.185.0.3

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

Pantheon

Server

Nginx

CDN

Fastly

Nameservers

ens1.jhmi.edu.ens1.jhu.edu.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
649 ms10%
Speed Index
844 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
7.4 MB
59 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.9.4
cms
Galaxisv1.9.1
by ScriptsTown
View Theme

Technology Stack

10 Technologies Detected

Plugins

5
Wp QuicklatexAccordion BlocksSdss_Wp_ShortcodesMl SliderDark Mode Toggle

Libraries

1
jQueryv3.7.1

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Analytics

1
Google Analytics

Web Servers

1
Nginx

SEO Analysis

B77/100
22
6
2
Meta Tags10/15
Content10/12
Headings3/8
Technical24/25
E-E-A-T2/7
Images2/7
Links5/5
URL5/5
Social5/5
Freshness4/4
Mobile4/4
Indexability3/3
S
sdss.orgsdss.org

Sloan Digital Sky Survey-V: Pioneering Panoptic Spectroscopy - SDSS-V

The Sloan Digital Sky Survey-V (SDSS-V) is the first facility providing multi-epoch optical & IR spectroscopy across the entire sky, as well as offering cont...

Description truncated.
Title Length69 chars

Recommended: 50-60 chars (~410px / 580px)

Description Length245 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (17/27) — critical for accessibility and SEO

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

5 sub-sitemaps

robots.txt

5 rules

Sitemap reference found

Local SEO

Local Search Readiness

21/100
Needs Work
7 11

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AI & LLM Readiness

D57/100
Bot Access
20/25
Machine Read.
10/25
Schema Data
7/25
Citation
20/25

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
nav
Text ratio:5%
Words:1,169
Token eff.:Optimal
Sections/1K:14.5
Depth:1/5

Structured Data

4 JSON-LD
Organization×1.1WebSiteBreadcrumbList
sameAs entity links

Citation Readiness

Opening Summary103w
Descriptive Headingsavg 5.7w
Canonical URL
Open Graph3/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (6)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

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.
A
81/100
14
Passed
3
Critical
1
Warnings
Images & Alt Text
18/20
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
15/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
5/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •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.
29/100
F
932 mg
CO₂e / view
7.4 MB
Page Weight
5%
Cleaner Than
New Visitor
1.06 g
vs
Returning (cached)
532 mg
Annual (10K/mo)
111.8 kg
Emission Segments
Data Center
208 mg
Network
224 mg
Device
500 mg
Resource Breakdown
JavaScript
66.2 KB
Images
7.1 MB
CSS
140.3 KB
HTML
25.8 KB
Green Hosting Not Verified
Pantheon
6 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

36%Critical
Interactive

HTTPS

No WAF

66d

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

05.04.2026

Valid Until

04.07.2026

Subject Alternative Names (2)

sdss.orgwww.sdss.org

SHA-256 Fingerprint

CE:82:3D:7A:BE:E7:CA:47:87:76:D4:45:71:11:D6:F0:D1:6E:0C:37...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges
bytes
age
143153
cache-control
🔵 1 Week(public, max-age=604800)
content-encoding
📦 Gzip(gzip)
content-length
26087
content-type
text/html; charset=UTF-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

70

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail.inscc.utah.edu

Domain Information

sdss.org

Domain Age
28y 1m

Created

09.03.1998

Expires

08.03.2035

Last Updated

29.10.2025

Registrar

MarkMonitor Inc.

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.
A
82/100
Mobile Friendly16 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
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Poppins + Open Sans

WCAG Partial
63/100
Readability
/30
24/30

17px · LH 1.50

Hierarchy
/20
7/20
WCAG
/25
18/25

3.33:1 min contrast

Performance
/25
14/25

3 fonts · 4 req

Heading Font

Poppins

Sans

Body Font

Open Sans

Sans17px

Contrast Ratio

3.33:1

2 issues

Reading Comfort

~37 CPL

Narrow lines
28px
h2
23px
h3
20px
h4
17px
p

✅ Excellent readability: 17px body text is ideal for all devices.

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

❌ Very complex text: Flesch score 30/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 3.3:1).

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

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

Buy on MyFontsFlesch 30

Color Palette

9 unique colors
10.55:1 AAA Light
#ffffff
Background· 33.5%
#3d3f43
Other· 4.9%
#4f5562
Secondary· 26.299999999999997%
#636a7e
Secondary· 13.9%
#1092f0
Primary· 6.5%
#747697
Secondary· 6%
#6b87af
Secondary· 4.3%
#c8cbd7
Secondary· 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

24 Resources

15
Scripts
9
Styles
1
Async
0
Defer

Top Script Sources

sdss.org(11)local(2)googletagmanager.com(1)kit.fontawesome.com(1)

Website Identity

SDSS

SDSS

Organization

Mapping the Universe

andrew.tkachenko@kuleuven.be
sdss.org/
28 years old
Location detected: 🇺🇸 United Statesvia ip
MarkMonitor Inc.en-US

Social Profiles

FacebookBluesky

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Last analyzed: 28 Apr 2026 at 23:18

Historical Analysis & Change Tracking