Mattermost vs Nextcloud Talk
| Tagline | Open-source, self-hostable Slack alternative for secure team messaging and collaboration | Self-hosted chat, video calls, and conferencing integrated into Nextcloud |
| Category | Team Chat & Collaboration | Team Chat & Collaboration |
| Replaces | Slack, Microsoft Teams, Discord | Slack, Microsoft Teams |
| GitHub stars | 39k | 2.2k |
| Language | Go | JavaScript |
| License | MIT | AGPL-3.0 |
| Self-host difficulty | 3/5 Moderate | 3/5 Moderate |
| Deploy options | One-Click Docker Docker Compose Kubernetes Manual | Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | yesterday | yesterday |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
Mattermost
- Many advanced features (LDAP/AD, SAML/SSO, compliance exports, high availability) are gated behind paid Enterprise tiers
- Search and message UX feel less polished than Slack
- Voice/video calling is more limited than Teams' full meetings stack
- Smaller third-party app/integration marketplace than Slack
Nextcloud Talk
- Requires a running Nextcloud installation as a prerequisite
- Larger group video calls need a separate High Performance Backend (Janus/signaling server) to scale
- Chat features are less rich than dedicated platforms like Slack
- Fewer third-party app integrations focused on messaging
Bottom line
Both are a similar lift to self-host; choose Mattermost for the larger community and ecosystem. Open each guide below for deploy steps and the full feature gap.
Mattermost
Open-source, self-hostable Slack alternative for secure team messaging and collaboration
Nextcloud Talk
Self-hosted chat, video calls, and conferencing integrated into Nextcloud