Best Boulder Alternatives in 2026
The top Boulder alternatives are EJBCA, DigiCert Private CA and SSL.com Private Enterprise PKI: 15 public key infrastructure software our editors would look at instead of Boulder, in our ranking order.
Boulder: A specialized, self-hosted foundation for organizations building an ACME CA service. Where it falls short: focused primarily on web PKI and ACME use cases.
Switching from Boulder? For most public key infrastructure software buyers the best Boulder alternative is EJBCA, built for broad, self-hosted enterprise PKI.
Why People Look for a Boulder Alternative
- Focused primarily on Web PKI and ACME use cases
- Docker Compose is intended for development, not production deployment
- Production use requires additional deployment and security work
Quick Picks by What You Need
- Best overallEJBCA9.4
Broad, self-hosted enterprise PKI
Visit EJBCA - Best free optionEJBCA9.4
Has a free plan
Visit EJBCA
All 15 Boulder Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forBroad, self-hosted enterprise PKI
- Better than Boulder:
- Editor score 9.4 vs 7.1
A broad, self-hosted PKI platform with deep certificate and deployment support.
9.4/10★★★★★Visit EJBCA -
Best forEnterprise hybrid and air-gapped PKI
- Better than Boulder:
- Editor score 9.2 vs 7.1
A flexible private CA for enterprises managing certificates across hybrid and air-gapped environments.
- EST support
- ACME support
- HSM integration
9.2/10★★★★★Visit DigiCert -
Best forOrganizations wanting priced managed PKI
- Better than Boulder:
- Editor score 9.1 vs 7.1
Managed private PKI with broad enrollment protocols, lifecycle controls, and published plan pricing.
- EST support
- ACME support
- HSM integration
9.1/10★★★★★Visit SSL.com -
Best forAdvanced PKI with HSMs and integrations
- Better than Boulder:
- Editor score 9.0 vs 7.1
A broad enterprise PKI platform for complex, HSM-backed environments.
- EST support
- ACME support
- HSM integration
9.0/10★★★★☆Visit AppViewX -
Best forOpen-source on-premises PKI teams
- Better than Boulder:
- Editor score 8.9 vs 7.1
A technically broad, on-premises PKI platform for teams managing their own certificate infrastructure.
- EST support
- ACME support
- HSM integration
8.9/10★★★★☆Visit XiPKI -
Best forOpen-source PKI with external CA support
- Better than Boulder:
- Editor score 8.8 vs 7.1
A broad open-source PKI platform for teams managing certificates, CAs, and enrollment workflows.
8.8/10★★★★☆Visit OpenXPKI -
Best forAWS-centric managed private CA
- Better than Boulder:
- Editor score 8.7 vs 7.1
A broad AWS-managed PKI service with clear CA pricing and usage-based certificate costs.
- HSM integration
- SCEP support
- Certificate profiles
8.7/10★★★★☆Visit AWS Private CA -
Best forDevice identity and managed-device PKI
- Better than Boulder:
- Editor score 8.6 vs 7.1
A broad cloud PKI platform for device certificates, authentication, and lifecycle control.
- EST support
- ACME support
- HSM integration
8.6/10★★★★☆Visit SecureW2 -
Best forCertificate discovery and lifecycle operations
- Better than Boulder:
- Editor score 8.5 vs 7.1
A broad platform for discovering, governing, renewing, and deploying enterprise certificates.
8.5/10★★★★☆Visit Keyfactor -
Best forMulti-CA certificate lifecycle management
- Better than Boulder:
- Editor score 8.4 vs 7.1
A broad platform for managing certificates across multiple certificate authorities and environments.
8.4/10★★★★☆Visit Entrust -
Best forHosted PKI with simple certificate operations
- Better than Boulder:
- Editor score 8.3 vs 7.1
A hosted PKI service with broad certificate operations and automation support.
8.3/10★★★★☆Visit Smallstep -
Best forAzure-integrated managed PKI
- Better than Boulder:
- Editor score 8.2 vs 7.1
A capable Azure-integrated PKI platform with clear paid tiers and no free plan.
- EST support
- ACME support
- HSM integration
8.2/10★★★★☆Visit EZCA -
Best forOpen-source TLS, mTLS, and SSH CA
- Better than Boulder:
- Editor score 8.1 vs 7.1
A flexible open-source CA for teams automating TLS, mTLS, SSH, and internal PKI.
- ACME support
- HSM integration
- SCEP support
8.1/10★★★★☆Visit step-ca -
Best forEstablished open-source traditional PKI
- Better than Boulder:
- Editor score 8.0 vs 7.1
A traditional, self-hosted PKI suite for teams that need open-source CA management.
- HSM integration
- SCEP support
- Certificate profiles
8.0/10★★★★☆Visit OpenCA PKI -
Best forManaged PKI with delegated administration
- Better than Boulder:
- Editor score 7.9 vs 7.1
A managed PKI service for centralized certificate control across users, devices, and systems.
- ACME support
- SCEP support
- Certificate profiles
7.9/10★★★★☆Visit GlobalSign
Boulder Alternatives: Common Questions
What is the best alternative to Boulder?
EJBCA: #1 in our Public Key Infrastructure Software ranking, with an editor score of 9.4 out of 10. A broad, self-hosted PKI platform with deep certificate and deployment support.
Is there a free alternative to Boulder?
Yes. EJBCA, SSL.com Private Enterprise PKI, XiPKI, OpenXPKI and step-ca have a free plan or a free tier (6 of the 15 alternatives on this page).
Why do people look for Boulder alternatives?
Focused primarily on Web PKI and ACME use cases; Docker Compose is intended for development, not production deployment; Production use requires additional deployment and security work.
How do I switch from Boulder?
Export your data from Boulder (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel Boulder.
How to Switch from Boulder
- Export your data from Boulder (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel Boulder.
Boulder vs Each Alternative
| # | Tool | Free plan | Paid from | Deployment model | ACME support | SCEP support | HSM integration | Score |
|---|---|---|---|---|---|---|---|---|
| 23 | Boulder | Free | On_premises | Yes | 7.1 | |||
| 1 | EJBCA | Yes | Free | 9.4 | ||||
| 2 | DigiCert Private CA | Hybrid | Yes | Yes | Yes | 9.2 | ||
| 3 | SSL.com Private Enterprise PKI | Yes | $2,000/yr | Cloud | Yes | Yes | Yes | 9.1 |
| 4 | AppViewX PKIaaS | No | Cloud | Yes | Yes | Yes | 9.0 | |
| 5 | XiPKI | Free | On_premises | Yes | Yes | Yes | 8.9 | |
| 6 | OpenXPKI | Yes | Free | 8.8 | ||||
| 7 | AWS Private Certificate Authority | No | $0.06/unit/mo | Cloud | Yes | Yes | 8.7 | |
| 8 | SecureW2 Managed PKI | Cloud | Yes | Yes | Yes | 8.6 | ||
| 9 | Keyfactor Platform | 8.5 | ||||||
| 10 | Entrust Certificate Manager | 8.4 | ||||||
| 11 | Smallstep Certificate Manager | 8.3 | ||||||
| 12 | EZCA | No | $200/unit/mo | Hybrid | Yes | Yes | Yes | 8.2 |
| 13 | step-ca | Yes | Free | Hybrid | Yes | Yes | Yes | 8.1 |
| 14 | OpenCA PKI | Yes | Free | On_premises | Yes | Yes | 8.0 | |
| 15 | GlobalSign Managed PKI | Cloud | Yes | Yes | 7.9 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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