Slack Broadcasts

Plain Broadcasts is a free, standalone app built by the Plain team to help you send high-quality updates to specific customer groups directly in Slack.

Whether you're announcing a new feature, sharing a changelog, or coordinating around an incident, Broadcasts makes it easy to deliver clear, branded messages right where your customers already are.

Broadcasts solve a growing problem for modern support and success teams: how to proactively communicate with users in Slack – without needing engineering help or a marketing platform.

Getting started

1. Define an Audience

Audiences let you control who receives your messages.

• Group your customer Slack channels into named audiences (e.g. “Enterprise Customers”, “Beta Users”, “EU Accounts”)

• You’ll only be able to add channels where the Plain app is installed

• Can’t see a channel? Hit the refresh icon next to the search box to update your list

This lets you send tailored updates – without noise or overlap.

2. Create a Broadcast

A Broadcast is the message you want to send. You can compose it using the familiar blocks you're used to from tools like Notion or Slack itself:

• Text

• Headings

• Lists

• Images

• Code blocks

• Emojis (use your system emoji picker – e.g. Ctrl + Cmd + Space on Mac or Windows key + ; on Windows)

Once sent, the Broadcast will appear as a well-formatted, visually clean message in each selected Slack channel – helping your updates get noticed and appreciated.