head to head · open source
Mattermost vs pki
Mattermost has 39,510 GitHub stars, 9,087 forks, 1,012 open issues and last shipped yesterday. pki has 514 stars, 160 forks, 46 open issues and last shipped yesterday. Mattermost leads on adoption by 7,587% (39,510 vs 514 stars). Mattermost is written in TypeScript under a custom or non-standard licence; pki is written in Java under GPL-2.0. Mattermost has attracted 23% as many forks as stars, pki 31%. Mattermost was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Mattermost | pki | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 514 |
| License | Custom / other | GPL-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 160 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mattermost if
- You weight community size — 40K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- 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 Mattermost
Mattermost is an open core, self hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th. Deploy Mattermost on premises, or try it for free in the cloud. Learn more about the following use cases with Mattermost: DevSecOps Incident Resolution IT Service Desk Other useful resources: Download and Install…
read the full Mattermost 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 Mattermost or pki more popular?
Mattermost has 39,510 GitHub stars and pki has 514. Mattermost has the larger community by that measure.
Are Mattermost and pki free?
Both are open source. Mattermost has no licence declared in this registry, and pki is licensed under GPL-2.0. Both are free to self-host.
What is the difference between Mattermost and pki?
Mattermost is written in TypeScript 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, Mattermost or pki?
Choose Mattermost if you want the larger community (39,510 stars) or its Custom / other licence terms. Choose pki if its feature set, stack or GPL-2.0 licence fits better. Both are self-hostable.