head to head · open source
Mattermost vs HashiCorp Vault
Mattermost has 39,093 GitHub stars, 9,000 forks, 1,012 open issues and last shipped yesterday. HashiCorp Vault has 36,260 stars, 4,759 forks, 1,435 open issues and last shipped yesterday. Mattermost leads on adoption by 8% (39,093 vs 36,260 stars). Mattermost is written in TypeScript under a custom or non-standard licence; HashiCorp Vault is written in Go under a custom or non-standard licence. Mattermost has attracted 23% as many forks as stars, HashiCorp Vault 13%. 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 | HashiCorp Vault | |
|---|---|---|
| GitHub stars | ★ 39K | ★ 36K |
| License | Custom / other | Custom / other |
| Written in | TypeScript | Go |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 9.0K | ⑂ 4.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mattermost if
- You weight community size — 39K 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 HashiCorp Vault if
- You want the HashiCorp Vault feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Go
- You evaluated both and HashiCorp Vault fits your workflow better
About Mattermost
Mattermost is an open core, self hosted collaboration platform for teams that need secure chat, workflow automation, voice calling, screen sharing, and AI integration while keeping the deployment under their own control.
read the full Mattermost overview →
About HashiCorp Vault
Vault is a secrets management tool built in Go, designed to securely store, control access to, and manage sensitive data such as API keys, passwords, certificates, and encryption keys. It operates as a centralized service that abstracts secret access across diverse systems, providing unified APIs and enforcing strict access policies. Vault lives in the HashiCorp ecosystem and integrates with infrastructure tools like Consul for storage backends and Terraform for provisioning workflows.
read the full HashiCorp Vault overview →
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Frequently asked questions
Is Mattermost or HashiCorp Vault more popular?
Mattermost has 39,093 GitHub stars and HashiCorp Vault has 36,260. Mattermost has the larger community by that measure.
Are Mattermost and HashiCorp Vault free?
Neither Mattermost nor HashiCorp Vault declares a licence in this registry, so check each project's own repository before relying on either for a commercial use. Both are free to self-host.
What is the difference between Mattermost and HashiCorp Vault?
Mattermost is written in TypeScript and HashiCorp Vault in Go. 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 HashiCorp Vault?
Choose Mattermost if you want the larger community (39,093 stars) or its Custom / other licence terms. Choose HashiCorp Vault if its feature set, stack or Custom / other licence fits better. Both are self-hostable.