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| Feature | Zulip | Slack | Mattermost | Discord |
|---|---|---|---|---|
| Apps for every platform | ||||
| Hundreds of integrations | ||||
| Self-hosting available | ||||
| Emoji reactions | ||||
| Markdown formatting | ||||
| Topic-based threading | ||||
| Lightning-fast search | ||||
| Free and open source | Open core * |
* Mattermost Team is open source, but many features are only available in their proprietary version, Mattermost Enterprise.