head to head · open source
certstrap vs pki
certstrap has 2,462 GitHub stars, 212 forks, 32 open issues and last shipped 2 days ago. pki has 515 stars, 160 forks, 46 open issues and last shipped 2 days ago. certstrap leads on adoption by 378% (2,462 vs 515 stars). certstrap is written in Go under Apache-2.0; pki is written in Java under GPL-2.0. certstrap has attracted 9% as many forks as stars, pki 31%. pki was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (certificate, certificate-authority, ssl), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| certstrap | pki | |
|---|---|---|
| GitHub stars | ★ 2.5K | ★ 515 |
| License | Apache-2.0 | GPL-2.0 |
| Written in | Go | Java |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 212 | ⑂ 160 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick certstrap if
- You weight community size — 2.5K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick pki if
- You want the pki feature set and don't need the biggest community
- You prefer the GPL-2.0 license terms
- Your stack matches Java
- You evaluated both and pki fits your workflow better
About certstrap
certstrap A simple certificate manager written in Go, to bootstrap your own certificate authority and public key infrastructure. Adapted from etcd ca. certstrap is a very convenient app if you don't feel like dealing with openssl, its myriad of options or config files. Common Uses certstrap allows you to build your own certificate system: 1. Initialize certificate authorities 2. Create identities and certificate signature requests for hosts 3. Sign and generate certificates Certificate architecture certstrap can init multiple certificate authorities to sign certificates with. Users can make arbitrarily long…
read the full certstrap overview →
About pki
Dogtag PKI The Dogtag Certificate System is an enterprise class open source Certificate Authority (CA). It is a full featured system, and has been hardened by real world deployments. It supports all aspects of certificate lifecycle management, including key archival, OCSP and smartcard management, and much more. The Dogtag PKI suite provides the following subsystems: Certificate Authority (CA) Key Recovery Authority (KRA) Online Certificate Status Protocol (OCSP) Responder Token Key Service (TKS) Token Processing System (TPS) Automatic Certificate Management Environment (ACME) Responder Documentation The best…
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Frequently asked questions
Is certstrap or pki more popular?
certstrap has 2,462 GitHub stars and pki has 515. certstrap has the larger community by that measure.
Are certstrap and pki free?
Both are open source. certstrap is licensed under Apache-2.0 and pki under GPL-2.0. Neither carries a licence fee.
What is the difference between certstrap and pki?
certstrap is written in Go and pki in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, certstrap or pki?
Choose certstrap if you want the larger community (2,462 stars) or its Apache-2.0 licence terms. Choose pki if its feature set, stack or GPL-2.0 licence fits better. Both are self-hostable.