Let's Encrypt
7.6#3 in public key infrastructure softwareFree planFree planWebAPILinuxmacOS
VisitLet's Encrypt vs Microsoft Active Directory
Microsoft Active Directory
5.4#18 in public key infrastructure softwareFrom $1,176 a monthWindows
VisitWhat both publish
| Fact | Let's Encrypt | Microsoft Active Directory |
|---|---|---|
| Headquarters | LinkedIn lists San Francisco, California as ISRG headquarters. | Redmond, Washington, United States |
Let's Encrypt plans
- Let's Encrypt certificatesFree
- Short-lived certificatesFree
Microsoft Active Directory plans
- Windows Server 2025 Standard$1,176 a month
- Windows Server 2025 Datacenter$6,771 a month
- Windows Server pay-as-you-go$33.58 a month
Pick Let's Encrypt if…
Let's Encrypt serves people and organizations worldwide who need certificates for domain-named web, mail, or FTP servers. It suits users able to manage certificates through ACME clients and consult documentation or community forums when needed.
Pick Microsoft Active Directory if…
Active Directory suits organizations managing identities and access in Windows Server environments. It fits deployments needing Kerberos or NTLM single sign-on and smart-card MFA.