head to head · open source
Mattermost vs Phase
Mattermost has 39,510 GitHub stars, 9,087 forks, 1,012 open issues and last shipped yesterday. Phase has 942 stars, 78 forks, 78 open issues and last shipped yesterday. Mattermost leads on adoption by 4,094% (39,510 vs 942 stars). Mattermost is written in TypeScript under a custom or non-standard licence; Phase is written in TypeScript under a custom or non-standard licence. Mattermost has attracted 23% as many forks as stars, Phase 8%. 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 | Phase | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 942 |
| License | Custom / other | Custom / other |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 78 |
| 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 Phase if
- You want the Phase feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches TypeScript
- You evaluated both and Phase 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 Phase
Repos Docs CLI Node SDK Python SDK Golang SDK Helm Chart Kubernetes Operator Terraform Provider Open source platform for fast moving engineering teams to secure and deploy application secrets — from development to production. Phase Console Demo 📦 SDKs : SDKs for integrating Phase with various programming languages and frameworks Explore Phase Console CLI Explore Phase CLI Getting started Check out the Quickstart Guides Use Phase Cloud The quickest and most reliable way to get started is by signing up on the Phase Console. Self host Phase
read the full Phase overview →
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Frequently asked questions
Is Mattermost or Phase more popular?
Mattermost has 39,510 GitHub stars and Phase has 942. Mattermost has the larger community by that measure.
Are Mattermost and Phase free?
Neither Mattermost nor Phase 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 Phase?
Mattermost is written in TypeScript and Phase in TypeScript. 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 Phase?
Choose Mattermost if you want the larger community (39,510 stars) or its Custom / other licence terms. Choose Phase if its feature set, stack or Custom / other licence fits better. Both are self-hostable.