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Best Boulder Alternatives in 2026

Updated

20 apps from public key infrastructure software ranked against Boulder on the same published basis.

  1. 1
    OpenCA PKI Free plan LinuxMacself-hostedWeb Free6.5
    Boulder vs OpenCA PKI
  2. 2
    step-ca Free plan apiLinuxMacself-hostedWin Free6.5
    Boulder vs step-ca
  3. 3
    XiPKI Free plan apiLinuxMacself-hosted Free6.4
    Boulder vs XiPKI
  4. 5
    SecureW2 Cloud NAC AndroidapiiOSLinuxMac 5.8
    Boulder vs SecureW2 Cloud NAC
  5. 6
    KeyTalk CKMS Free trial AndroidiOSLinuxMacself-hosted €5/mo5.7
    Boulder vs KeyTalk CKMS
  6. 7
    Cloudflare Serverless Registry LinuxMacself-hostedWin 5.6
    Boulder vs Cloudflare Serverless Registry
  7. 8
    Entrust Certificate Manager AndroidapiiOSLinuxself-hosted 5.6
    Boulder vs Entrust Certificate Manager
  8. 9
    HashiCorp Nomad apiLinuxMacself-hostedWeb 5.6
    Boulder vs HashiCorp Nomad
  9. 10
    DigiCert Private CA apiLinuxself-hostedWeb 5.5
    Boulder vs DigiCert Private CA
  10. 11
    Keyfactor Platform Free trial apiself-hostedWeb 5.5
    Boulder vs Keyfactor Platform
  11. 12
    SSL.com Certificate Lifecycle Management apiWeb 5.5
    Boulder vs SSL.com Certificate Lifecycle Management
  12. 13
    EZCA Free trial AndroidapiiOSLinuxMac $200/mo5.4
    Boulder vs EZCA
  13. 14
    GlobalSign Atlas apiWeb 5.4
    Boulder vs GlobalSign Atlas
  14. 15
    EJBCA Web 5.1
    Boulder vs EJBCA
  15. 16
    OpenXPKI WebLinux 5.1
    Boulder vs OpenXPKI
  16. 17
    Sectigo Certificate Manager Free trial apiWeb $20.83/mo5.1
    Boulder vs Sectigo Certificate Manager
  17. 18
    AppViewX PKIaaS Free trial apiself-hostedWeb 5.0
    Boulder vs AppViewX PKIaaS
  18. 19
    AWS Private Certificate Authority Free trial apiWeb $50/mo5.0
    Boulder vs AWS Private Certificate Authority
  19. 20
    Dogtag Certificate System Linux 5.0
    Boulder vs Dogtag Certificate System
  20. 21
    Let's Encrypt 5.0
    Boulder vs Let's Encrypt

Boulder alternatives compared

#AppScoreFree planFromRuns on
1OpenCA PKI6.5Free planFreeLinux, Mac, self-hosted, Web
2step-ca6.5Free planFreeAPI, Linux, Mac, self-hosted, Windows
3XiPKI6.4Free planFreeAPI, Linux, Mac, self-hosted
5SecureW2 Cloud NAC5.8No—Android, API, iOS, Linux, Mac, Web, Windows
6KeyTalk CKMS5.7No€5/moAndroid, iOS, Linux, Mac, self-hosted, Windows
7Cloudflare Serverless Registry5.6No—Linux, Mac, self-hosted, Windows
8Entrust Certificate Manager5.6No—Android, API, iOS, Linux, self-hosted, Web
9HashiCorp Nomad5.6No—API, Linux, Mac, self-hosted, Web, Windows
10DigiCert Private CA5.5No—API, Linux, self-hosted, Web
11Keyfactor Platform5.5No—API, self-hosted, Web
12SSL.com Certificate Lifecycle Management5.5No—API, Web
13EZCA5.4No$200/moAndroid, API, iOS, Linux, Mac, self-hosted, Web, Windows
14GlobalSign Atlas5.4No—API, Web
15EJBCA5.1No—Web
16OpenXPKI5.1No—Web, Linux
17Sectigo Certificate Manager5.1No$20.83/moAPI, Web
18AppViewX PKIaaS5.0No—API, self-hosted, Web
19AWS Private Certificate Authority5.0No$50/moAPI, Web
20Dogtag Certificate System5.0No—Linux
21Let's Encrypt5.0No——
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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 6.5 out of 10. The others here: step-ca, XiPKI, SecureW2 Cloud NAC 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 free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.