Stop copy-pasting into 50 channels.
Write it once, see exactly how it’ll land in Slack, then post it to all your customer channels at the same time. It shows up the way you wrote it, not a mangled copy.
Compose once, send to many, see it land
Send now or schedule it, hit every channel at once, and see what actually landed. No script to maintain.
An audience builder that gets out of the way
Find channels, group them, save the group by name. Reuse it next time.
What you write is what they get
The preview runs the same code as the send. Nothing shifts when it reaches the channel.
One composer, every sender.
Common questions
What is Stet?
Stet is a broadcast composer for Slack. You write a customer message once, preview exactly how it'll render in Slack, then send it to many channels at once with per-channel delivery tracking.
How do I send one message to multiple Slack channels?
Build an audience — a saved group of channels — compose your message, preview the render, and send or schedule it to the whole group in one action.
Is Stet an alternative to Thena Broadcasts?
Yes. Stet is a Slack-first, API/MCP-native broadcasting tool focused on send fidelity — what you preview is what lands in the channel.
Will the Slack message look like the preview?
Yes. The preview runs the same render code as the send, so nothing shifts between what you write and what your customers see.
Can I schedule a Slack broadcast?
Yes. Send now or schedule it for later, and watch which channels actually received it.
Your next broadcast, in every channel.
Get early access while we’re onboarding the first teams.