21st.dev
React Components, Templates & Themes — 12,000+ Crafted UI | 21st | 21st
Last scanned Jul 26, 2026, 11:49 AM
Overall score
Great
Summary
12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. This website uses Next.js behind Vercel CDN. SEO is good (80/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
21st
12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. Preview live, install with one command — for you and your AI agent.
Top issues to fix
8 issues found · 1 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
+2 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
24 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
21st
12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. Preview live, install with one command — for you and your AI agent.
Contact
Email, phone, and address published on this site's own pages.
- support@21st.dev
Meta tags
- Title
- React Components, Templates & Themes — 12,000+ Crafted UI | 21st | 21st
- Description
- 12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. Preview live, install with one command — for you and your AI agent.
- Canonical
- https://21st.dev
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1, viewport-fit=cover
- Robots meta
- Manifest
- https://21st.dev/manifest.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Vercel
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- 21st.dev
- Valid from
- Jun 30, 2026
- Valid to
- Sep 28, 2026
- Days until expiry
- 61
- SAN domains
- 21st.dev
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 6 · H3 6
Links
54 internal · 4 external · 20 broken
Images
51 total · 0 missing alt
Scripts / Styles
85 scripts · 2 stylesheets
JS / CSS size
59.9 KB · 5.0 KB
Page size
179 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Title longer than 60 characters
- Meta description longer than 160 characters
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://21st.dev
- Final URL
- https://21st.dev
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 21 ms
- HTML size
- 179 KB
- Redirect chain
- https://21st.dev
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does 21st.dev use?
- 21st.dev is built with Next.js, Google Analytics, Meta Pixel.
- Is 21st.dev secure (HTTPS)?
- Yes. 21st.dev uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.
- Who hosts 21st.dev?
- Hosting provider information for 21st.dev is not available yet.
- What is 21st.dev's SEO score?
- 21st.dev scored 80/100 for SEO in the latest analysis (great).
- What is 21st.dev's overall website score?
- 21st.dev has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
- What company operates 21st.dev?
- 21st.dev is operated by 21st. 12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. Preview live, install with one command — for you and your AI agent.
OpenGraph & Twitter Card
OpenGraph
Twitter Card