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 760,629 live website that are using Lets Encrypt.

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Technology usage statistics

Websites using Lets Encrypt 760,629 websites
Most popular in the country United States of America
Market position in Certificate Authority #2
Market share in Certificate Authority 14.27%

Technology adoption

Recent changes in Lets Encrypt usage. (See Lets Encrypt Usage Changes report)
Websites that added Lets Encrypt +1,852,532
Websites that dropped Lets Encrypt -3,795

Distribution by websites popularity

Lets Encrypt detection in the top websites by popularity
Top 10k sites 699 websites
Top 100k sites 7,910 websites
Top 1m sites 77,232 websites

Websites utilizing Lets Encrypt

Top websites that use Lets Encrypt

Domain Country Rank Contacts
commons.wikimedia.org United States of America 124
fr.wikipedia.org United States of America 172
ted.com United States of America 243
9to5mac.com United States of America 297
arduino.cc United States of America 344
www.deezer.com United States of America 388
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 582,177 domains. Total 8,008,737 domains found using UTF-8
Category - Document Standards.
JavaScript is used together with Lets Encrypt on 469,485 domains. Total 6,050,225 domains found using JavaScript
Category - Mobile.
Viewport Meta is used together with Lets Encrypt on 423,371 domains. Total 5,008,842 domains found using Viewport Meta
Category - Programming Languages.
PHP is used together with Lets Encrypt on 380,192 domains. Total 3,981,507 domains found using PHP
Category - Document Standards.
Description Meta is used together with Lets Encrypt on 347,384 domains. Total 4,082,872 domains found using Description Meta
Category - JavaScript Libraries.
jQuery is used together with Lets Encrypt on 337,108 domains. Total 4,099,561 domains found using jQuery


Alternative Technologies


Actalis CA: Total 39,464 domains found using Actalis CA
AlphaSSL CA: Total 88,425 domains found using AlphaSSL CA
Apple CA: Total 1,699 domains found using Apple CA
AWS Certificate Manager: Total 186,341 domains found using AWS Certificate Manager
Certum CA: Total 19,537 domains found using Certum CA
Cloudflare Certificate: Total 700,763 domains found using Cloudflare Certificate
COMODO CA: Total 236,796 domains found using COMODO CA
Cybertrust Japan CA: Total 30,787 domains found using Cybertrust Japan CA
DFN-CERT: Total 8,826 domains found using DFN-CERT
DigiCert: Total 393,979 domains found using DigiCert