cellectis.com

https://cellectis.com· First analyzed 28 May 2026· Updated 28 May 2026

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cellectis.com

Mobile

Sponsored

Hosting Provider

Celeste SAS

IP Address

178.16.164.60

Site Location

🇫🇷 Paris, Francevia schema_nap

Server Location

🇫🇷 Champs-sur-Marne, France

ASN

AS34177

Organization

Celeste SAS

Server

Nginx

Nameservers

ns3.cellectis.com.ns2.cellectis.com.ns1.cellectis.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

2.3 s10%

Speed Index

3.0 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1001 KB

30 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Celeste SAS

Technology Stack

8 Technologies Detected

Analytics

Libraries

Other

CSS Frameworks

Advertising

Web Servers

Customer Support

SEO Analysis

C62/100

Meta Tags8/15

Content12/12

Headings4/8

Technical15/21

E-E-A-T2/7

Images1/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

cellectis.comcellectis.com

Home | Cellectis

Cellectis is a clinical-stage biopharmaceutical company developing the Next-Generation CAR T-Cells to Cure Cancer

Title Length16 chars

Recommended: 50-60 chars (~93px / 580px)

Description Length113 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (3/3) — critical for accessibility and SEO

7 issues found

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Local SEO

Local Search Readiness

14/100

Poor

4 14 2

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

Sponsored

AI & LLM Readiness

D48/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

1/25

Citation

13/25

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:22%

Words:2,718

Token eff.:Optimal

Depth:1/5

Structured Data

1 JSON-LD

sameAs entity links

Citation Readiness

Opening Summary74w

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (6)

AI readiness recommendation preview...

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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.

76/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

18/20

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

4/15

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

3 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.

43/100

124 mg

CO₂e / view

1000.6 KB

Page Weight

70%

Cleaner Than

New Visitor

141 mg

Returning (cached)

71 mg

Annual (10K/mo)

14.8 kg

Emission Segments

Data Center

28 mg

Network

30 mg

Device

66 mg

Resource Breakdown

JavaScript

97.1 KB

Images

336.9 KB

CSS

554.1 KB

HTML

12.5 KB

Green Hosting Not Verified

Celeste SAS

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

31%Critical

Interactive

HTTPS

No WAF

157d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Gandi SAS

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

01.10.2025

Valid Until

01.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.cellectis.comcellectis.com

SHA-256 Fingerprint

58:30:A9:41:8E:B1:5E:49:A8:0F:6B:7C:89:8C:EF:D2:8E:9D:FA:C2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Thu, 28 May 2026 18:50:45 GMT

expires

Sat, 26 Jul 1997 05:00:00 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

cellectis-com.mail.eo.outlook.com

Domain Information

cellectis.com

Domain Age

26y 5m

Created

10.12.1999

Expires

10.12.2027

Last Updated

03.07.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

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.

64/100

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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Akkurat

WCAG Partial

75/100

Readability

/30

21/30

18px · LH 1.61

Hierarchy

/20

15/20

4x ratio

WCAG

/25

19/25

3.32:1 min contrast

Performance

/25

20/25

1 font · 3 req

Heading Font

Akkurat

Sans72px

Body Font

Akkurat

Sans18px

Contrast Ratio

3.32:1

Below AA

Reading Comfort

~41 CPL

Narrow lines

72px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

❌ Very complex text: Flesch score 27/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 0 elements below WCAG AA threshold (min 3.3:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

Buy on MyFontsFlesch 27

Color Palette

15 unique colors

4.66:1 AA Light

#ffffff

Text· 9.1%

#73747a

Other· 6.3%

#163457

Primary· 13.6%

#d9dbe1

Secondary· 7.5%

#70a3e0

Accent· 7.4%

#040e1f

Accent· 6.6%

#263541

Secondary· 6.4%

#91b5df

Accent· 5.4%

Business & Marketing Stack

3 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

LinkedIn AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)snap.licdn.com(2)consent.cookiebot.com(2)consentcdn.cookiebot.com(1)ajax.googleapis.com(1)

Website Identity

cellectis.com

26 years old

8 rue de la Croix Jarry, Paris

75013, Paris

Location detected: 🇫🇷 France, Parisvia schema_nap

Gandi SAS📧 Microsoft 365en

Social Profiles

X (Twitter)LinkedIn

Sponsored

Last analyzed: 28 May 2026 at 18:51

Historical Analysis & Change Tracking