Slack scheduler. Schedule messages to your Slack channels.

Send release notes, launch posts and team updates to Slack at the same time as your social posts. Postbroad posts through a Slack app you make and shows each message as accepted with a link.

Start for $0 Slack limits

SLSlackAvailable now

What you connectChannels in a Slack workspace, through your own Slack appYour own app keys

How live is confirmedAccepted, with a link from the network

What you can post to Slack.

The rules Postbroad checks before a Slack post is scheduled. Facts marked as not yet confirmed are still being checked against Slack's own pages.

Text40,000 characters. Slack asks for 4,000 or fewer.Confirmed on the network

MediaImagesNot yet confirmed

ThreadsReplies in a thread under your messageNot yet confirmed

ExtrasA custom name and icon for the messageNot yet confirmed

As Postbroad applies them on 4 Nov 2026. Slack can change its rules; so does this table. Accepted, with a link from the network.

Before you connect

A Slack app you create at api.slack.com
Permission to add apps to your Slack

Connect in three steps

Create or sign in to your own Slack account.
Make your own app on Slack, then add its keys in Platform apps in Postbroad.
Connect Slack in Postbroad and pick where to post.

Let your agent post to Slack.

Your AI agent can draft and schedule Slack posts through Postbroad, with a preview first. Its drafts wait for you unless you allow more.

Ask your agentExample

Draft a Slack version of this week's launch post
for Northwind. Show me the preview, and don't
schedule anything until I say yes.

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Slack questions.

What can I post to Slack?

Text: 40,000 characters. Slack asks for 4,000 or fewer. Media: Images. Threads: Replies in a thread under your message. Extras: A custom name and icon for the message.

Does Slack need to approve my app?

No review is needed. You connect channels in a Slack workspace, through your own Slack app.

How do I know a Slack post went live?

Slack accepts the post and Postbroad shows it as accepted, with the link Slack gives. It isn't called checked, because Postbroad doesn't read it back.

Can an AI agent post to Slack for me?

Yes, through the Postbroad MCP server or the API. Its drafts wait for you unless you switch on autonomy for the brand.