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ensembl.org

https://ensembl.org· First analyzed 23 Apr 2026· Updated 23 Apr 2026
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ensembl.org
Desktop screenshot of ensembl.org
Mobile screenshot of ensembl.org
Mobile

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Hosting Provider

IP Address

193.62.193.83

Site Location

🇬🇧 United Kingdomvia ip

Server Location

🇬🇧 Cambridge, United Kingdom

ASN

AS786

Organization

European Bioinformatics Institute

Server

GitHub.com

CDN

Fastly

Nameservers

ns73.domaincontrol.com.ns74.domaincontrol.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
263 ms10%
Speed Index
342 ms10%
Largest Contentful Paint
25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2 KB
3 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Platform
GitHub Pages
CDN
Fastly

SEO Analysis

F32/100
7
12
3
Meta Tags4/15
Content5/12
Headings5/8
Technical3/21
E-E-A-T0/7
Images4/7
Links2/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability0/3
E
ensembl.orgensembl.org

Service unavailable

No description available for this page.

Title Length19 chars

Recommended: 50-60 chars (~109px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

  • Missing meta description — important for click-through rates in SERPs
  • Page is set to noindex — will not appear in search results
  • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

Crawlability

Sitemap

Type: index

22 URLs

22 sub-sitemaps

robots.txt

150 rules

Sitemap reference found

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

F32/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
0/25
Citation
4/25

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
header/footer
Text ratio:29%
Words:98
Token eff.:Too Short
Sections/1K:10
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary26w
Descriptive Headingsavg 2w
Canonical URL
Open Graph0/3
Twitter Card0/3
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.
B
74/100
9
Passed
3
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
14/20
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...

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.
55/100
A+
<0.001 g
CO₂e / view
2.5 KB
Page Weight
95%
Cleaner Than
New Visitor
<0.001 g
vs
Returning (cached)
<0.001 g
Annual (10K/mo)
36 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
<0.001 g
Resource Breakdown
HTML
2.5 KB
Green Hosting Not Verified
European Bioinformatics Institute
4 recommendations
  • Carbon footprint recommendation preview...
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

39d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GoDaddy.com, Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.05.2025

Valid Until

02.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.ensembl.orgensembl.org

SHA-256 Fingerprint

9D:B6:7C:43:C0:70:0D:C0:2C:2D:6C:B9:49:2D:91:A4:28:C9:EA:CE...

Recommendations

Security recommendation preview

HTTP Headers

Developer Console

accept-ranges
bytes
access-control-allow-origin
*
age
2968
content-length
2218
content-type
text/html; charset=utf-8
date
Thu, 23 Apr 2026 17:51:48 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

70

SPF
DKIM
DMARC

MX Records (2)

ironport1.embl.de
ironport2.embl.de

Domain Information

ensembl.org

Domain Age
26y 3m

Created

20.01.2000

Expires

20.01.2030

Last Updated

10.12.2024

Registrar

GoDaddy.com, LLC

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.
D
41/100
Not 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.
3 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

Luxi Sans

WCAG AAA
70/100
Readability
/30
18/30

14px · LH --

Hierarchy
/20
14/20

1.67x ratio

WCAG
/25
24/25

9.4:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Luxi Sans

Sans24px

Body Font

Luxi Sans

Sans14px

Contrast Ratio

9.4:1

WCAG AAA (≥7:1)

Reading Comfort

~42 CPL

Narrow lines
24px
h1
18px
h3
14px
p

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

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

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 9.4:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

✅ Lean font stack: 1 font families keeps load times fast.

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

Color Palette

6 unique colors
3.34:1 AA Large Light
#ffffff
Background· 84.4%
#898c9a
Secondary· 1.8%
#333365
Primary· 8.7%
#f0f0eb
Secondary· 2.5%
#c6bea6
Secondary· 1.9%
#434571
Secondary· 0.7%

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Website Identity

ensembl.org

26 years old
Location detected: 🇬🇧 United Kingdomvia ip
GoDaddy.com, LLC

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Last analyzed: 23 Apr 2026 at 17:52

Historical Analysis & Change Tracking