I have dug into our KeyChest.net database and pulled some interesting stats about a set of about 500,000 certificates. Here’s two things that I found interesting:
- Let’s Encrypt seems to be steadily growing - data from server audits (i.e., what certificates are actually installed); it grew from 33% to 38% in less than 18 months
- COMODO is the only real contender in terms of the number of issued certificates - 19% and that’s largely due to CDNs using it
You can also compare the number of 33% of servers using Let’s Encrypt to the number of 52%, which is a proportion of LE certificates in CT logs (= all issued certificates).
You can read more details on my blog: