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 263,500 live websites that are using Lets Encrypt.

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Technology usage statistics

Websites using Lets Encrypt 263,500 websites
Most popular in the country United States of America
Market position in Certificate Authority #16
Market share in Certificate Authority 1.35%

Technology adoption

Recent changes in Lets Encrypt usage. (See Lets Encrypt Usage Changes report)
Websites that added Lets Encrypt +17,634
Websites that dropped Lets Encrypt -15,416

Distribution by websites popularity

Lets Encrypt detection in the top websites by popularity
Top 10k sites 4 websites
Top 100k sites 278 websites
Top 1m sites 4,079 websites

Websites utilizing Lets Encrypt

Top websites that use Lets Encrypt

Domain Country Rank Contacts
swpc.noaa.gov United States of America 2,492
incredibox.com United Kingdom 6,032
israeli-weapons.com United States of America 6,094
anticon.com United States of America 7,206
hellopippa.com Austria 10,008
lschurch.org United States of America 10,532
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


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Cloudflare Certificate: Total 2,771,139 domains found using Cloudflare Certificate
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DFN-CERT: Total 13,503 domains found using DFN-CERT