“1. Mattermost Best for granular access control”
“Best for granular access control”
“- Advanced role-based permissions.”
“- Attribute-based access control (ABAC).”
“- Policies can determine which teams and channels users can access.”
“- Delegated administration lets different managers administer specific areas.”
“- Particularly interesting for organizations with complex departmental structures.”
“Self-hosting | Yes | Yes | No | No”
“Enterprise integrations | Yes | Yes | Yes | Excellent”
“2. Rocket.Chat Best for custom roles”
“Best for custom roles”
“- Custom roles with individually configurable permissions.”
“- Global and room-level roles.”
“- Room owners, leaders, and moderators.”
“- Private teams and channels.”
“- Fine-grained control over who can create, join, view, and manage channels.”
“Its permission matrix is particularly interesting if you want managers to have different powers in different channels.”
“Self-hosting | Yes | Yes | No | No”
“Enterprise integrations | Yes | Yes | Yes | Excellent”
“- Public and private channels.”
“- Single-channel and multi-channel guest accounts.”
“- Specialized administrative roles, including channel and user administration.”
“Very polished, easy to administer, and excellent for everyday collaboration.”
“Enterprise integrations | Yes | Yes | Yes | Excellent”
“Custom roles | Yes | Yes | Limited/custom admin roles | Team/channel roles”
“Channel-level permissions | Advanced | Advanced | More limited | Moderate”
“Attribute-based access | Yes | Available capabilities vary | Limited | Via Microsoft identity/security”
“Self-hosting | Yes | Yes | No | No”
“However, custom roles should not be confused with arbitrary per-channel visibility policies.”
“- Standard, private, and shared channels.”
“- Private channels with individually managed membership.”
“- Shared channels for collaboration across teams.”
“- Channel moderation and posting restrictions.”
“- Integrates with Microsoft 365 and its identity and security administration.”
“Particularly suitable if your organization already uses Microsoft 365.”
“Enterprise integrations | Yes | Yes | Yes | Excellent”
“Channel-level permissions | Advanced | Advanced | More limited | Moderate”
“Self-hosting | Yes | Yes | No | No”
“Its channel moderation is useful, although moderation permissions are different from visibility permissions.”