head to head · open source
certstrap vs pki
certstrap has 2,454 GitHub stars, 212 forks, 32 open issues and last shipped 8 months ago. pki has 509 stars, 162 forks, 46 open issues and last shipped 2 days ago. certstrap leads on adoption by 382% (2,454 vs 509 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 32%. 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 | ★ 509 |
| License | Apache-2.0 | GPL-2.0 |
| Written in | Go | Java |
| Last push | 2026-02-03 | 2026-09-18 |
| Forks | ⑂ 212 | ⑂ 162 |
| 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 is a simple certificate manager written in Go that bootstraps a private certificate authority and public key infrastructure, aimed at operators and developers who need to issue TLS certificates without wrestling with openssl.
read the full certstrap overview →
About pki
Dogtag PKI is an enterprise class open source Certificate Authority suite, written in Java and licensed under GPL 2.0, for administrators who need to run their own certificate lifecycle infrastructure rather than buy it as a hosted service.
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Frequently asked questions
Is certstrap or pki more popular?
certstrap has 2,454 GitHub stars and pki has 509. 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 (2,454 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.