20,313 companies use Let's Encrypt, as of October 2026.
Let's Encrypt: Free TLS certificates. We've found 20,313 companies using Let's Encrypt, most often in IT Services (17%) and Software (14%), typically with 51–200 employees and 34% based in United States.
Customers20,313companies use it
Most popular withNightlife20× more likely than average
We've found 20,313 companies using Let's Encrypt among the 177,583 we've scanned so far. We only count a company when a direct public record backs it up.
What kind of companies use Let's Encrypt?
Let's Encrypt customers are most often in IT Services (17%), Software (14%) and Financial Services (9%). The most common company size is 51–200 employees (46% of customers with a known size).
Which countries use Let's Encrypt the most?
Most Let's Encrypt customers we've found are in United States (34%), Germany (8%) and India (8%).
What are the alternatives to Let's Encrypt?
The most used alternatives in the same category are GlobalSign (23,786 companies), Proofpoint (19,305 companies), reCAPTCHA (16,911 companies) and DigiCert (14,385 companies).
How does runsonwhat know a company uses Let's Encrypt?
We read public traces only. For Let's Encrypt that means the company's published subprocessor list. Every match keeps the record it came from.
