AI Slack scheduler: post to Slack from ChatGPT, Claude or Postozo Chat
Ask an AI app in plain words, or write the posts yourself. Schedule messages and files to Slack channels, with follow-ups as replies in the thread.
Post to Slack from ChatGPT, Claude or Postozo Chat
Ask for Slack channel messages in plain words. Postozo gives the AI the Slack rules, checks every post against them and schedules nothing until you say yes.
ChatGPT
Connect Postozo as a custom app in ChatGPT's developer mode, then ask it for Slack posts.
Claude
Add Postozo to Claude with your personal link, then ask Claude to plan and schedule Slack posts.
Postozo Chat
Open Postozo Chat (Agent in the Postozo menu), pick your Slack channel and ask. No other app needed.
Everything you need in a Slack post scheduler
- Schedule Slack channel messages for any date and time, or post right away
- Write once for many channels, then change the text for Slack only
- Preview the post before it goes out
- Add a first comment or a thread, with an optional wait between each part
- Repeat the post every day, week or month
- Send it to a client for approval first
- Use AI to fit the text to Slack's length and style
How to connect Slack
- In Postozo, click Add Channel and pick Slack.
- Paste your details: Bot token, Channel ID.
- Save. The channel appears in your channel list.
See the step by step guide to connect Slack, with screenshots.
Slack rules we check for you
Slack markdown (mrkdwn). Files are uploaded to the channel. Follow-up comments become replies in the thread.
Who uses Postozo for Slack
Internal announcements
Community workspaces
Weekly updates for a team
Tips for Slack
- Slack uses its own markdown, called mrkdwn. Use *bold* and bullet lists for clear updates.
- Files are uploaded to the channel with the message.
- Follow-up comments become replies in the thread, which keeps the channel tidy.
- Postozo posts with a Slack app bot token. The app needs chat:write and files:write, and you paste the channel ID.
Example Slack post
A regular update at the same time each week, with questions kept in the thread. This is sample text to show the format, not a real customer post.
Checklist before you schedule a Slack post
- The text is under 40,000 characters for Slack.
- No more than 10 photos or files are attached.
- The first comment or thread parts are written, if you want them.
- The channel sits under the right customer, so approval rules apply.
- A time is picked, or the post uses the next free slot.
How approval, AI and reports work on Slack
Approval. If the Slack channel belongs to a customer with approval turned on, every post waits for a yes. The client sees a preview on a review link and can approve, ask for changes or comment. A post that is changed after approval goes back for a new yes.
AI. The AI assistant can fit a post to Slack, keeping it under 40,000 characters, in your brand voice. It can also translate it, suggest a first comment and write alt text for pictures. Nothing changes until you accept.
Analytics. Postozo does not read post results from Slack, so there are no Slack numbers on the analytics page. You can still count clicks on your links with short links.
Bulk upload. Plan many Slack posts in a spreadsheet and upload them as a CSV file with bulk upload: up to 500 lines, each checked against Slack's rules before anything is created.
Client reports. Slack posts are counted in client reports, without network numbers, because Slack does not share them.
Client accounts. A client can connect their own Slack account from a client connect link, filling in Bot token, Channel ID on the link page, so no password changes hands.
Related features
Check a draft against the Slack limit with the free Slack character counter, or count for every network at once with the social media character counter.
Other tools that post to Slack
Also looking at other schedulers for Slack? Read our comparisons with Postiz.
Can I schedule Slack channel messages with Postozo?
Yes. Connect your account, write the post, pick a date and time, and Postozo publishes it for you.
How many characters can I use in a post on Slack?
Postozo allows up to 40,000 characters for Slack, which is the limit we check before saving.
Can I add a first comment on Slack?
Yes. Add follow-up comments in the editor, with an optional wait between each.
Can I post to Slack from ChatGPT or Claude?
Yes. Connect Postozo to ChatGPT or Claude, or use Postozo Chat in the app, and ask for Slack channel messages. It checks the Slack rules and schedules each post only after you say yes.
Can I post to Slack and other networks at the same time?
Yes. Pick all the channels you want in 1 post, and change the text for any single channel.
Is Slack included in every plan?
Yes. Every plan includes all 30 channel types. Plans differ in how many channels you can connect. See Pricing.
How do I schedule Slack posts?
Connect Slack once, write the post in the post editor, pick a date and time and save. Postozo publishes it for you and tells you in plain words if Slack says no.
Can I schedule Slack posts from my phone?
There is no Postozo mobile app today. Postozo runs in a web browser.
Post to Slack from your AI app
Connect Slack, then ask ChatGPT, Claude or Postozo Chat for your first week of posts.
7 day free trial. No card needed.