Let's Encrypt
7.6#3 in public key infrastructure softwareFree planFree planWebAPILinuxmacOS
VisitLet's Encrypt vs ManageEngine Key Manager Plus
ManageEngine Key Manager Plus
7.6#5 in certificate management softwareFrom $475 a yearFree planWebAPILinuxSelf-hosted
VisitWhat both publish
| Fact | Let's Encrypt | ManageEngine Key Manager Plus |
|---|---|---|
| Company size | LinkedIn lists ISRG as having 11–50 employees. | LinkedIn lists ManageEngine as privately held with 5,001–10,000 employees. |
| Documentation | The official documentation covers onboarding, ACME clients, rate limits, staging, certificate policy, challenge types, profiles, revocation, compatibility and integration guidance. | The vendor documentation hub provides online help, quickstart material, FAQs, system requirements, security specifications, case studies, tutorials and release notes. |
| Headquarters | LinkedIn lists San Francisco, California as ISRG headquarters. | Pleasanton, California, United States |
| Intended users | The service is available to people and organizations worldwide that need certificates for domain-named servers, including web, mail, and FTP servers. | The product is positioned for enterprises seeking centralized management of certificates and machine identities across their IT infrastructure. |
| Rating on G2 | 4.8 out of 5 from 22 reviews. | 4.5 out of 5 from 3 reviews |
Let's Encrypt plans
- Let's Encrypt certificatesFree
- Short-lived certificatesFree
ManageEngine Key Manager Plus plans
- Free EditionFree
- On-premises license (25 managed keys)$59 a month
- Subscription — 25 keys$475 a year
- On-premises license (25 managed keys)$599 a year
- On-premises perpetual license (25 managed keys)$1,188, paid once
- Perpetual — 25 keys$1,188, paid once
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 ManageEngine Key Manager Plus if…
Key Manager Plus suits enterprises seeking centralized management of certificates and machine identities. It also fits teams that manage SSH or PGP keys and need certificate renewal alerts and audit trails.