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clerk.com

Clerk | Authentication and User Management

Last scanned Aug 1, 2026, 9:00 PM · 10 views

88

Overall score

Great

Summary

The easiest way to add authentication and user management to your application. This website uses Next.js behind Vercel CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance good (80/100). Top issue: Multiple H1 headings found.

Clerk

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

Top issues to fix

6 issues found · 1 high priority

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • 4 cookies without Secure/HttpOnly flags

    Security

    Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

  • 20 broken links on the page

    SEO

    Fix or remove broken links — they waste crawl budget and erode user trust.

85

SEO

3 issue(s) found

80

Performance

652 ms

90

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

+3 overall since Jul 25, 2026

Overall
88
SEO
85
Security
90
Performance
80
Accessibility
100

Organization

Company details published in this site's own structured data.

Clerk

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

X (Twitter)GitHubLinkedInYouTube

Contact

Email, phone, and address published on this site's own pages.

Meta tags

Title
Clerk | Authentication and User Management
Description
The easiest way to add authentication and user management to your application. Purpose-built for React, Next.js, Remix, and “The Modern Web”.
Canonical
https://clerk.com
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
Clerk | Authentication and User Management
og:description
The easiest way to add authentication and user management to your application. Purpose-built for React, Next.js, Remix, and “The Modern Web”.
og:type
website
og:url
https://clerk.com

Twitter Card

twitter:card
summary_large_image
twitter:title
Clerk | Authentication and User Management
twitter:description
The easiest way to add authentication and user management to your application. Purpose-built for React, Next.js, Remix, and “The Modern Web”.

Technologies

Detected frameworks, languages, and tools.

Next.js

Hosting & CDN

Hosting provider
—
CDN provider
Vercel
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
clerk.com
Valid from
Jul 11, 2026
Valid to
Oct 9, 2026
Days until expiry
68
SAN domains
clerk.com

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyMissing
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyMissing

Compression: gzip · 4 cookie(s) observed

Content & assets

Headings

H1 6 · H2 11 · H3 18

Links

41 internal · 19 external · 20 broken

Images

102 total · 0 missing alt

Scripts / Styles

163 scripts · 3 stylesheets

JS / CSS size

275 KB · 328 B

Page size

1.2 MB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Multiple H1 headings found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://clerk.com
Final URL
https://clerk.com
HTTP status
200
HTTP version
HTTP/2
Response time
628 ms
HTML size
1.2 MB
Redirect chain
https://clerk.com

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Frequently asked questions

What technology does clerk.com use?
clerk.com is built with Next.js.
Is clerk.com secure (HTTPS)?
Yes. clerk.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 9, 2026.
Who hosts clerk.com?
Hosting provider information for clerk.com is not available yet.
What is clerk.com's SEO score?
clerk.com scored 85/100 for SEO in the latest analysis (great).
What is clerk.com's overall website score?
clerk.com has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
What company operates clerk.com?
clerk.com is operated by Clerk. The easiest way to add authentication and user management to your application. Purpose-built for React, Next.js, Remix, and “The Modern Web”.
Has clerk.com's score changed over time?
clerk.com's overall score has improved by 3 points (from 85 to 88) since Jul 25, 2026.