Lets Encrypt

Category - Certificate Authority

Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG).



We have discovered 78,489 live website that are using Lets Encrypt.

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Technology usage statistics

Websites using Lets Encrypt 78,489 websites
Most popular in the country United States of America
Market position in Certificate Authority #15
Market share in Certificate Authority 1.54%

Technology adoption

Recent changes in Lets Encrypt usage. (See Lets Encrypt Usage Changes report)
Websites that added Lets Encrypt +1,052
Websites that dropped Lets Encrypt -32,429

Distribution by websites popularity

Lets Encrypt detection in the top websites by popularity
Top 10k sites 16 websites
Top 100k sites 583 websites
Top 1m sites 7,620 websites

Websites utilizing Lets Encrypt

Top websites that use Lets Encrypt

Domain Country Rank Contacts
swpc.noaa.gov United States of America 2,492
www.archlinux.org Germany 2,797
www.trackitdown.net United Kingdom 5,009
www.grafikart.fr France 5,620
kharabeesh.com United States of America 5,695
hispantv.com Denmark 5,877
See full domain list
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Market Share

Lets Encrypt market share within the Certificate Authority category

Geographical Distribution

Technology usage distribution by websites across the globe.






Lets Encrypt often used together with


Category - Document Encoding.
UTF-8 is used together with Lets Encrypt on 60,435 domains. Total 8,059,052 domains found using UTF-8
Category - Document Standards.
JavaScript is used together with Lets Encrypt on 42,756 domains. Total 6,019,684 domains found using JavaScript
Category - Programming Languages.
PHP is used together with Lets Encrypt on 42,150 domains. Total 3,970,765 domains found using PHP
Category - Mobile.
Viewport Meta is used together with Lets Encrypt on 38,761 domains. Total 5,070,400 domains found using Viewport Meta
Category - Web Servers.
Nginx is used together with Lets Encrypt on 35,709 domains. Total 3,333,143 domains found using Nginx
Category - Web Servers.
Apache is used together with Lets Encrypt on 33,303 domains. Total 3,668,704 domains found using Apache


Alternative Technologies


Actalis CA: Total 40,111 domains found using Actalis CA
AlphaSSL CA: Total 87,704 domains found using AlphaSSL CA
Apple CA: Total 1,742 domains found using Apple CA
AWS Certificate Manager: Total 197,850 domains found using AWS Certificate Manager
Certum CA: Total 31,508 domains found using Certum CA
Cloudflare Certificate: Total 728,708 domains found using Cloudflare Certificate
COMODO CA: Total 39,787 domains found using COMODO CA
cPanel CA: Total 429,379 domains found using cPanel CA
Cybertrust Japan CA: Total 30,780 domains found using Cybertrust Japan CA
DFN-CERT: Total 9,785 domains found using DFN-CERT