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clerk.com

https://clerk.com· First analyzed 06 May 2026· Updated 06 May 2026
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clerk.com
Desktop screenshot of clerk.com
Mobile screenshot of clerk.com
Mobile

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Hosting Provider

Vercel
vercel.com

IP Address

76.76.21.21

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Walnut, United States

ASN

AS16509

Organization

Vercel, Inc

Server

Vercel

Nameservers

dns2.easydns.net.dns3.easydns.ca.ns1.dnsimple.com.ns2.dnsimple.com.+3 more

Performance

96

Core Web Vitals

Weight

First Contentful Paint
1.1 s10%
Speed Index
1.4 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2.1 MB
149 requests

Image Optimization

Lazy LoadWebPAVIFResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

Hybrid
🔀 Hybrid
Frontend
Framework
Next.js
Styling
Tailwind CSS
Infrastructure
Platform
Vercel
CDN
Vercel Image

Technology Stack

5 Technologies Detected

Meta Frameworks

2
Next.jsRemix

Other

1
D3.js

CSS Frameworks

1
Tailwind CSS

Platforms

1
Vercel

SEO Analysis

B72/100
23
3
1
Meta Tags14/15
Content8/12
Headings6/8
Technical18/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
C
clerk.comclerk.com

Clerk | Authentication and User Management

The easiest way to add authentication and user management to your application. Purpose-built for React, Next.js, Remix, and “The Modern Web”.

Title Length42 chars

Recommended: 50-60 chars (~257px / 580px)

Description Length141 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (61/102) — critical for accessibility and SEO

4 issues found

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Crawlability

Sitemap

Type: standard

2,860 URLs

robots.txt

6 rules

Sitemap reference found

Local SEO

Local Search Readiness

8/100
Poor
3 12 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

D52/100
Bot Access
20/25
Machine Read.
19/25
Schema Data
0/25
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.txtvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
code blocksnav
Text ratio:1%
Words:1,607
Token eff.:Optimal
Sections/1K:2.5
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary53w
Descriptive Headingsavg 1.6w
Canonical URL
Open Graph3/3
Twitter Card3/3
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.
A
87/100
14
Passed
1
Critical
0
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
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
13/15
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.

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.
58/100
D
222 mg
CO₂e / view
2.1 MB
Page Weight
50%
Cleaner Than
New Visitor
254 mg
vs
Returning (cached)
127 mg
Annual (10K/mo)
26.6 kg
Emission Segments
Data Center
11 mg
Network
65 mg
Device
146 mg
Resource Breakdown
JavaScript
1.2 MB
Images
281.0 KB
CSS
173.1 KB
Fonts
182.2 KB
HTML
106.9 KB
Other
178.4 KB
Green Hosting Verified
Vercel
Provider Match
3 recommendations
  • •Carbon footprint recommendation preview...
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C

Security Score

61%Fair
Interactive

HTTPS

No WAF

32d

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

10.03.2026

Valid Until

08.06.2026

Subject Alternative Names (1)

clerk.com

SHA-256 Fingerprint

97:13:08:63:94:9C:14:31:A0:2A:F0:3E:AE:05:7F:18:A3:FB:74:67...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin
*
age
44079
cache-control
🟡 0s(public, max-age=0, must-revalidate)
content-disposition
inline
content-encoding
⚡ Brotli(br)
content-type
text/html; charset=utf-8
Good Warning Issue

Email Infrastructure

Google Workspace

Score

95

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt4.aspmx.l.google.com
alt1.aspmx.l.google.com
alt3.aspmx.l.google.com
aspmx.l.google.com

+1 more

Domain Information

clerk.com

Domain Age
30y 1m

Created

10.04.1996

Expires

11.04.2033

Last Updated

12.09.2024

Registrar

Register.com - Network Solutions, LLC

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
Privacy policy page linked

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.
B
75/100
Mobile Friendly1 breakpoint
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

Typography & Readability

geistNumbers

WCAG AA
80/100
Readability
/30
23/30

20px · LH 1.40

Hierarchy
/20
20/20

3.2x ratio · ✓ H1→H6

WCAG
/25
21/25

5.27:1 min contrast

Performance
/25
16/25

2 fonts · 14 req

Heading Font

geistNumbers

Sans64px

Body Font

geistNumbers

Sans20px

Contrast Ratio

5.27:1

WCAG AA (≥4.5:1)

Reading Comfort

~39 CPL

Narrow lines
64px
h1
17px
h2
16px
h3
20px
p

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 24/100. Consider shorter sentences and simpler words.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.3:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 3.2x larger than body text.

Buy on MyFontsFlesch 24

Color Palette

3 unique colors
12.53:1 AAA Light
#f9f9f9
Background· 83.9%
#312f37
Secondary· 10.1%

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

23 Resources

20
Scripts
3
Styles
20
Async
0
Defer

Top Script Sources

local(20)

Website Identity

clerk.com

[email protected]
30 years old
Location detected: 🇺🇸 United Statesvia ip
Register.com - Network Solutions, LLC📧 Google Workspaceen

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Last analyzed: 06 May 2026 at 09:44

Historical Analysis & Change Tracking