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 36,171,249 live websites that are using Lets Encrypt.

Download website list

Technology usage statistics

Websites using Lets Encrypt 36,171,249 websites
Most popular in the country United States of America
Market position in Certificate Authority #1
Market share in Certificate Authority 47.70%

Technology adoption

Recent changes in Lets Encrypt usage. (See Lets Encrypt Usage Changes report)
Websites that added Lets Encrypt +466,658
Websites that dropped Lets Encrypt -392,548

Distribution by websites popularity

Lets Encrypt detection in the top websites by popularity
Top 10k sites 2,021 websites
Top 100k sites 28,605 websites
Top 1m sites 408,121 websites

Websites utilizing Lets Encrypt

Top websites that use Lets Encrypt

Domain Country Rank Contacts
en.wikipedia.org United States of America 53
monorail-edge.shopifysvc.com United States of America 144
microformats.org United States of America 148
dan.com United States of America 150
www.jsdelivr.com United States of America 151
mozilla.org United States of America 178
See full domain list
Flat price per the report, subscription is not required.

Market Share

Lets Encrypt market share within the Certificate Authority category

Geographical Distribution

Technology usage distribution by websites across the globe.








Alternative Technologies


DigiCert: Total 6,307,751 domains found using DigiCert
Sectigo: Total 6,246,340 domains found using Sectigo
Cloudflare Certificate: Total 5,343,058 domains found using Cloudflare Certificate
cPanel CA: Total 4,472,033 domains found using cPanel CA
Encryption Everywhere CA: Total 2,599,593 domains found using Encryption Everywhere CA
GoDaddy CA: Total 2,125,025 domains found using GoDaddy CA
Starfield CA: Total 1,828,564 domains found using Starfield CA
RapidSSL CA: Total 1,538,476 domains found using RapidSSL CA
GlobalSign CA: Total 1,463,260 domains found using GlobalSign CA
AWS Certificate Manager: Total 1,015,451 domains found using AWS Certificate Manager