The Best Public Key Infrastructure Software in 2026
We researched public key infrastructure software from official websites, including pricing pages, plan tables, and product documentation. Products are ranked on their core certificate-authority and enrollment capabilities, value for money, and verified features, so buyers can compare platforms for building and operating cryptographic identity infrastructure.
Our top picks
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Top ranked
EJBCA#1 of 269.4/10A broad, self-hosted PKI platform with deep certificate and deployment support.
Free plan · 30-day trial
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Runner-up
DigiCert Private CA#2 of 269.2/10A flexible private CA for enterprises managing certificates across hybrid and air-gapped environments.
Pricing on request
-
Top-ranked free plan
SSL.com Private Enterprise PKI#3 of 269.1/10Managed private PKI with broad enrollment protocols, lifecycle controls, and published plan pricing.
Free plan
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.
The full ranking 26 tools, best first
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Best forBroad, self-hosted enterprise PKI
A broad, self-hosted PKI platform with deep certificate and deployment support.
Free plan · 30-day trial Our EJBCA verdict → Visit EJBCAFor vendors Sponsor this spot · #1 · $149/mo →9.4/10★★★★★Visit EJBCA -
Best forEnterprise hybrid and air-gapped PKI
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
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
A broad enterprise PKI platform for complex, HSM-backed environments.
- EST support
- ACME support
- HSM integration
Pricing on request · 30-day trial Our AppViewX PKIaaS verdict → Visit AppViewXFor vendors Sponsor this spot · #4 · $69/mo →9.0/10★★★★☆Visit AppViewX -
Best forOpen-source on-premises PKI teams
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
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
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
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
A broad platform for discovering, governing, renewing, and deploying enterprise certificates.
8.5/10★★★★☆Visit Keyfactor -
Best forMulti-CA certificate lifecycle management
A broad platform for managing certificates across multiple certificate authorities and environments.
8.4/10★★★★☆Visit Entrust -
Best forHosted PKI with simple certificate operations
A hosted PKI service with broad certificate operations and automation support.
8.3/10★★★★☆Visit Smallstep -
Best forAzure-integrated managed PKI
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
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
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
A managed PKI service for centralized certificate control across users, devices, and systems.
- ACME support
- SCEP support
- Certificate profiles
7.9/10★★★★☆Visit GlobalSign -
Best forCloud PKI for TLS and device certificates
A cloud PKI platform for private certificates, automation, device enrollment, and lifecycle control.
- EST support
- ACME support
- HSM integration
7.8/10★★★★☆Visit Sectigo -
Best forCross-platform certificate lifecycle management
A broad PKI platform for discovering, managing, automating, and deploying certificates across environments.
7.7/10★★★★☆Visit KeyTalk -
Best forFree Linux-based CA and certificate services
A capable free CA for Linux teams that can manage and operate PKI themselves.
7.6/10★★★★☆Visit Dogtag -
Best forOpen-source CA tooling and certificate operations
A free, self-hosted toolkit for teams operating certificate authorities and TLS workflows.
- Certificate profiles
7.5/10★★★★☆Visit Cloudflare -
Best forKubernetes-native certificate automation
A focused, free certificate automation layer for Kubernetes and OpenShift.
7.4/10★★★★☆Visit cert-manager -
Best forIntune-managed device certificate deployment
A focused PKI service for automating certificates across Intune-managed endpoints.
7.3/10★★★★☆Visit Microsoft -
Best forFree automated public TLS certificates
A focused, free ACME service for automating publicly trusted TLS certificates.
7.2/10★★★★☆Visit Let's Encrypt -
Best forOrganizations building an ACME CA service
A specialized, self-hosted foundation for organizations building an ACME CA service.
- ACME support
7.1/10★★★★☆Visit Boulder -
Best forTeams needing PKI alongside secrets management
A broad secrets platform with certificate lifecycle management for teams needing PKI alongside secrets.
6.8/10★★★☆☆Try HashiCorp Vault -
Best forCloud secret storage with certificate rotation
A cloud secret manager with certificate rotation, versioning, IAM, and audit controls.
6.5/10★★★☆☆Visit Google Cloud -
Best forWindows directory environments needing authentication
A strong Windows directory service, but not a dedicated PKI platform.
6.3/10★★★☆☆Visit Microsoft
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Deployment model | Score |
|---|---|---|---|---|---|
| 1 | EJBCA | Yes | Free | 9.4 | |
| 2 | DigiCert Private CA | Hybrid | 9.2 | ||
| 3 | SSL.com Private Enterprise PKI | Yes | $2,000/yr | Cloud | 9.1 |
| 4 | AppViewX PKIaaS | No | Cloud | 9.0 | |
| 5 | XiPKI | Free | On_premises | 8.9 | |
| 6 | OpenXPKI | Yes | Free | 8.8 | |
| 7 | AWS Private Certificate Authority | No | $0.06/unit/mo | Cloud | 8.7 |
| 8 | SecureW2 Managed PKI | Cloud | 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 | 8.2 |
| 13 | step-ca | Yes | Free | Hybrid | 8.1 |
| 14 | OpenCA PKI | Yes | Free | On_premises | 8.0 |
| 15 | GlobalSign Managed PKI | Cloud | 7.9 | ||
| 16 | Sectigo Private PKI | Cloud | 7.8 | ||
| 17 | KeyTalk CKMS | 7.7 | |||
| 18 | Dogtag Certificate System | Yes | Free | 7.6 | |
| 19 | CFSSL | Free | On_premises | 7.5 | |
| 20 | cert-manager | Yes | Free | 7.4 | |
| 21 | Microsoft Cloud PKI | No | $2/user/mo | 7.3 | |
| 22 | Let's Encrypt | Yes | Free | 7.2 | |
| 23 | Boulder | Free | On_premises | 7.1 | |
| 24 | HashiCorp Vault | Yes | Free | 6.8 | |
| 25 | Google Cloud Secret Manager | Yes | $0.03/unit/mo | Cloud | 6.5 |
| 26 | Microsoft Active Directory | No | 6.3 |
Head-to-head All 28 comparisons →
- EJBCA vs DigiCert Private CA
- EJBCA vs SSL.com Private Enterprise PKI
- EJBCA vs AppViewX PKIaaS
- EJBCA vs XiPKI
- EJBCA vs OpenXPKI
- EJBCA vs AWS Private Certificate Authority
- EJBCA vs SecureW2 Managed PKI
- DigiCert Private CA vs SSL.com Private Enterprise PKI
- DigiCert Private CA vs AppViewX PKIaaS
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How we rank public key infrastructure software
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update