We need one-way broadcast channels where only a few people can post company updates — which team chat tools handle announcement channels best?

“Slack offers particularly good control over channel posting permissions.”

“Restrict posting to admins, selected individuals, or designated publishers.”

“Everyone else can read messages.”

“Configure who can reply to messages and use company-wide mentions.”

“Teams has a dedicated channel moderation feature.”

“Only moderators can start new posts.”

“Choose whether regular employees can reply to existing posts.”

“Control whether bots and connectors can publish messages.”

“One limitation: channel moderation applies to standard channels, not private or General channels.”

“Google Chat supports dedicated announcement spaces.”

“Only designated Space Managers can publish announcements.”

“Employees can react to announcements.”

“You can allow or disable employee replies.”

“One important consideration: announcement-space type must be selected when creating the space.”

“Mattermost supports read-only announcement channels through advanced access controls.”

“Useful for organizations wanting greater infrastructure control.”

“Restrict posting to channel administrators.”

“Note that some advanced controls depend on the Mattermost edition.”

“Zoom has particularly useful channel-level permissions.”

“You can also restrict who can use @all mentions.”

“Not the main focus”