Schedule Slack messages in advance
Queue a month of Slack messages in minutes and let postqueen publish them at the times you pick. No reminders, no copy and paste.
SlackThe Slack scheduler that runs itself
Schedule release notes, standup prompts and channel announcements as native Slack messages with mrkdwn formatting, delivered to every workspace and channel exactly on time.
Start a 7-day trial for $0Slack is where launches get announced, communities get onboarded and customers get updates, and important messages slip when someone has to hit send manually. Teams queue release notes, weekly digests and event reminders in advance so every channel hears the news at the same moment. postqueen publishes through a Slack app you install once.
AI drafts tuned for Slack
The built-in assistant writes and rewrites messages in a tone that fits Slack, so nothing reads like it was pasted from another network.
Cross-post to 30 channels
Send the same idea to Slack and every other channel you run, with per-platform tweaks before anything goes live.
Post to the right channels
Pick exactly which channels each message goes to and keep announcements consistent across all of them.
Slack limits and specs, at a glance
Message length
Up to 40,000 characters per message through the Slack API
Formatting
Slack mrkdwn: bold, italics, code blocks, quotes and links
File uploads
Files up to 1 GB each
Rate limit
About one message per second per channel, with short bursts allowed
App requirement
The postqueen app must be installed in the workspace and invited to private channels
Limits come from the platform's official API and can change.
Everything you need in a Slack scheduler
Visual Slack content calendar
Drafts, queued messages and published history on a week or month view. Drag to reschedule, click to edit.
Channel‹ Week of Jul 13 ›
Mon
Tue
Wed
Thu
Launch post
Product tip
Thread
Poll
Blog link
Reel
+ New Channel✦ Generate Posts
AI assistant on every draft
Generate, shorten or rewrite Slack messages with one prompt, then fine-tune the result before it publishes.
✦ AI Content Assistant
Here is a tighter hook for Tuesday's post: Ship your week of content in one sitting.
Great, schedule it for 9 AM and draft one for LinkedIn too.
Send Message
One workspace for the whole team
Keep all your Slack messages in a shared calendar with roles, comments and a clean history.
Channel‹ Week of Jul 13 ›
Mon
Tue
Wed
Thu
Launch post
Product tip
Thread
Poll
Blog link
Reel
+ New Channel✦ Generate Posts
Cross-post from Slack to everywhere else
Write it once for Slack, then send the same idea to every other channel you run. postqueen supports 30 platforms and tailors captions, hashtags and formats for each one before anything goes live.
One post, tailored per platform
Captions, hashtags and formats adjust automatically before publishing.
Instagram✓
X✓
LinkedIn✓
TikTok✓Put your Slack on autopilot
Queue weeks of messages in one sitting and let postqueen publish each one right on time. Unlimited posts on every plan.
F.A.Q.
Frequently asked questions
How does postqueen connect to Slack?
Through an official Slack app with OAuth. You approve the app for your workspace, pick the channels it can post to, and every scheduled message goes out through Slack's API. Nobody shares passwords and you can revoke access from Slack at any time.
Which Slack formats can I schedule?
Messages with full mrkdwn formatting (bold, italics, code blocks, quotes and links) plus images and file attachments. The composer previews the message, so what you see is what the channel gets.
Can postqueen post to private channels?
Yes, once the app has been invited. Someone in the private channel invites the postqueen app, and from then on scheduled messages land normally. A missing invite is the most common reason a private channel post fails.
Can I send one update to several channels or workspaces?
Yes. Select any mix of connected channels across your workspaces and postqueen delivers the message to each one. You can adjust the wording per channel before it goes out.
Can AI draft my Slack announcements?
Yes. The built-in assistant writes and rewrites messages in a tone that fits your team, and nothing publishes until you schedule it. You can also drive Slack posting from Claude Code, ChatGPT or any other agent through the MCP server and the CLI.
When should I schedule Slack messages?
Match your audience's working hours: announcements land best when the channel is awake, which may span several timezones. Scheduling lets one person queue the message once instead of someone staying online to post it.
Can I cross-post Slack updates to Discord and Telegram?
Yes. All three are native postqueen channels, so a single draft can feed your Slack workspace, Discord server and Telegram channel. Each destination gets its own formatting tweaks first.
Is there a free trial for Slack scheduling?
Yes. All postqueen cloud plans include a 7-day free trial with unlimited posts, and you can cancel anytime. Self-hosting is free with the open source version.
Ready to get started?
Queue this week's posts in minutes, or hand the whole thing to your favorite AI. postqueen keeps publishing either way.
Seven days free. Cancel in one click from settings.