Slack

Schedule Slack channel announcements for customers, communities, and teams

Weekly product updates, all-hands notes, and daily community prompts, written once and delivered on time. FoPost posts through a Slack incoming webhook, so setup takes a minute and no app install is needed.

Schedule your first Slack message See pricing

A post previewed exactly as Slack will render it, before it publishes

Works alongside

Webhook setup

Paste one URL. No OAuth, no admin approval.

Mentions

@channel, @here, and @user land as real mentions.

Attachments

Files and rich blocks in any message.

Customer channels

Every customer hears the update the same morning

Shared Slack channels are where customers actually read release notes. Write the update once in FoPost, pick every customer channel, and schedule it for their working hours instead of pasting it twenty times.

Connect a channel

A month of scheduled posts on the publishing calendar

Multi-channel

One message, many webhooks, one send time.

Timezone aware

Schedule per channel so nobody gets pinged at 3am.

Attachments

Up to 100 attachments and 50 blocks per message.

Formatting

Messages that read well at a glance

A good Slack update has a headline, a few bullets, and a link. FoPost keeps your formatting intact, resolves mentions, and previews the message the way Slack will render it before you schedule.

Write an update

A caption written once, with the post previewed as each network renders it

Slack markup

Bold, lists, code, and links, up to 40,000 characters.

Mentions

@channel, @here, and individual users.

Threaded follow-ups

Schedule the original and the reply that follows it.

Recurring

The standup prompt that never forgets

Communities run on rituals: the Monday question, the Friday wins thread, the weekly newsletter. Set any message to recur and FoPost posts it on schedule, so the ritual survives holidays and busy weeks.

Set up a recurring message

Recurring messages

Daily, weekly, or custom cadence per channel.

Visual calendar

See Slack alongside every other network you post to.

Cross-post

Announce in Slack and on your social accounts in the same minute.

AI writing

Turn a changelog into a message people read

Paste the release notes and FoPost drafts the customer-facing version: what changed, why it matters, where to click. Rewrite it shorter for a busy channel or longer for an internal one, in your brand voice.

Try the AI writer

Update drafts

From raw notes to a readable announcement in one pass.

Brand voice

Tone and vocabulary applied to every draft.

Webhooks and API

Every publish and failure event pushed to your own tools.

Specs

What FoPost publishes to Slack

Formats, limits, and how the connection works, so there are no surprises at publish time.

Formats

Channel messages
Mentions
Attachments

Limits

Message limit: 40,000 chars
Blocks per message: Up to 50
Attachments: Up to 100
Edit after publishing: Yes
Unpublish: Yes

Connection

Connects via Slack incoming webhook URL. No OAuth, no permissions.

Slack questions, answered

How do I connect a Slack channel?

In Slack, create an incoming webhook for the channel and paste its URL into FoPost. No OAuth flow and no workspace admin approval are required.

Can I post to several channels or workspaces?

Yes. Each webhook is one destination, so add a webhook per channel across as many workspaces as you need and pick them in the composer.

Do mentions work?

Yes. @channel, @here, and user mentions are sent as real Slack mentions and notify the way they would if typed in Slack.

What are the limits?

Up to 40,000 characters, 50 blocks, and 100 attachments per message, matching Slack’s own ceilings.

Can I schedule a message and a threaded reply?

Yes. Schedule the original message and a follow-up reply that posts into its thread.

Is there an API for posting to Slack through FoPost?

Yes. The REST API and SDKs expose the same publish and schedule endpoints the dashboard uses.

Start publishing to Slack today

Starting is free. Connect Slack, schedule a week of posts, and see the results before you pay.

Schedule your first Slack message

Plus more

Every other network FoPost supports

View all platforms