Slack broadcast tools, compared
The best ways to send one Slack message to many channels
You can post in each channel by hand, build a workflow in Slack Workflow Builder, set up a Zap in Zapier, or use a broadcast tool like Threadly, which sends to channels, segments or DMs at once and shows who responded.
What each option is good for
Threadly
- Sends to many channels, a CRM segment or DMs in one go
- Works in customer and partner Slack Connect channels
- Adds forms and booking buttons, and tracks who responded
Slack Workflow Builder
- Built into Slack
- Good for automating internal processes
- A fit if you already use it for the rest of your workflow
Zapier
- Connects thousands of apps
- Good when Slack is one step in a longer workflow
- A fit if your team already runs on Zaps
Posting by hand
- No setup
- Fine for two or three channels
- Gets slow as the channel list grows
What a broadcast looks like in Threadly
Write the update once, pick channels, a segment or people, and every recipient gets their own message with working buttons.
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Side by side
- What it is
- Threadly:An app for Slack that sends messages to many channels
- Workflow Builder:Slack’s built-in automation tool
- Zapier:An automation platform for connecting apps
- By hand:Posting in each channel yourself
- Best at
- Threadly:Updates, surveys and invites to many channels and people
- Workflow Builder:Internal processes like approvals and requests
- Zapier:Moving data between apps
- By hand:A few channels, once in a while
- Where you use it
- Threadly:In Slack, the Threadly web app, or through the Threadly API and MCP server
- Workflow Builder:In Slack
- Zapier:In the Zapier editor, or through Zapier’s API and MCP server
- By hand:In Slack
What Threadly adds
One send, many channels
Pick channels, a saved segment or people, and each gets its own copy of the message.
Customer and partner channels
Send to Slack Connect channels shared with customers and partners, from your workspace.
Audiences from your CRM
Segments built from HubSpot, Attio or Clay fields that update as your data changes.
Forms inside Slack
A button opens a form as a Slack modal: text, dropdown, date and multi-select fields.
Meetings booked in Slack
Calendly, Cal.com, SavvyCal or HubSpot meetings, booked from a button in the message.
Who responded
Clicks, replies and form responses by channel and by person, for every send.
Frequently asked questions
What is a Slack broadcast tool?
A tool that sends one message to many Slack channels or people at once, instead of posting in each channel by hand. Good ones also add buttons and forms and show who responded.
What should I look for in a Slack broadcast tool?
Sending to many channels or a segment at once, Slack Connect support, personalization, buttons and forms people use inside Slack, CRM targeting, and tracking on who responded.
Which Slack broadcast tool is best for customer channels?
For customer and partner Slack Connect channels, Threadly is built for the job: it sends to every shared channel at once, targets accounts from your CRM and shows which accounts responded.
Send your next update to every channel
Add Threadly to Slack, pick your channels and send once. Free to start.