Best Boulder Alternatives in 2026
Updated
20 apps from public key infrastructure software ranked against Boulder on the same published basis.
- 1Boulder vs OpenCA PKI
- 2Boulder vs step-ca
- 3Boulder vs SecureW2 Cloud NAC
- 4Boulder vs XiPKI
- 5Boulder vs EZCA
- 7Boulder vs Entrust Certificate Manager
- 8Boulder vs KeyTalk CKMS
- 9Boulder vs HashiCorp Nomad
- 10Boulder vs Cloudflare Serverless Registry
- 11Boulder vs Keyfactor Platform
- 12Boulder vs SSL.com Certificate Lifecycle Management
- 13Boulder vs DigiCert Private CA
- 14Boulder vs GlobalSign Atlas
- 15Boulder vs Sectigo Certificate Manager
- 16Boulder vs AWS Private Certificate Authority
- 17Boulder vs AppViewX PKIaaS
- 18Boulder vs Smallstep ZTNA
- 19Boulder vs Microsoft Active Directory
- 20Boulder vs Microsoft Cloud PKI
- 21Boulder vs OpenXPKI
Boulder alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | OpenCA PKI | 7.1 | Free plan | Free | Linux, Mac, self-hosted, Web |
| 2 | step-ca | 7.1 | Free plan | Free | API, Linux, Mac, self-hosted, Windows |
| 3 | SecureW2 Cloud NAC | 6.9 | No | — | Android, API, iOS, Linux, Mac, Web, Windows |
| 4 | XiPKI | 6.9 | Free plan | Free | API, Linux, Mac, self-hosted |
| 5 | EZCA | 6.8 | No | $200/mo | Android, API, iOS, Linux, Mac, self-hosted, Web, Windows |
| 7 | Entrust Certificate Manager | 6.7 | No | — | Android, API, iOS, Linux, self-hosted, Web |
| 8 | KeyTalk CKMS | 6.7 | No | €5/mo | Android, iOS, Linux, Mac, self-hosted, Windows |
| 9 | HashiCorp Nomad | 6.6 | No | — | API, Linux, Mac, self-hosted, Web, Windows |
| 10 | Cloudflare Serverless Registry | 6.5 | No | — | Linux, Mac, self-hosted, Windows |
| 11 | Keyfactor Platform | 6.4 | No | — | API, self-hosted, Web |
| 12 | SSL.com Certificate Lifecycle Management | 6.4 | No | — | API, Web |
| 13 | DigiCert Private CA | 6.3 | No | — | API, Linux, self-hosted, Web |
| 14 | GlobalSign Atlas | 6.3 | No | — | API, Web |
| 15 | Sectigo Certificate Manager | 6.2 | No | $20.83/mo | API, Web |
| 16 | AWS Private Certificate Authority | 6.1 | No | $50/mo | API, Web |
| 17 | AppViewX PKIaaS | 6.0 | No | — | API, self-hosted, Web |
| 18 | Smallstep ZTNA | 5.8 | No | — | iOS, Linux, Mac, Windows |
| 19 | Microsoft Active Directory | 5.7 | No | $33.58/mo | Windows |
| 20 | Microsoft Cloud PKI | 5.7 | No | $2/mo | Android, iOS, Mac, Windows |
| 21 | OpenXPKI | 5.5 | No | — | Web, Linux |
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Questions about Boulder alternatives
What is the best alternative to Boulder?
OpenCA PKI, number 1 in public key infrastructure software with a score of 7.1 out of 10. The others here: step-ca, SecureW2 Cloud NAC, XiPKI and 16 more.
What is the best free alternative to Boulder?
OpenCA PKI is the best-ranked alternative with a free plan. 3 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes: documentation depth, a free tier and the platforms it runs on.