Notion comment threads automatically appear in your Slack channel
Comments on Notion pages are powerful collaboration points, but they're hidden from people not actively viewing that page. This automation posts comments to a dedicated Slack channel so your entire team sees the discussion and can participate if needed.
Trigger
New Comment
Triggers when a new comment is added to a specified Notion block or page.
Action
Post message to channel
Deprecated: posts a message to a slack channel, direct message, or private channel. use `send message` instead.
Why this helps
Neurodivergent founders often use Notion comments for detailed feedback but assume people will read them. Critical feedback gets missed, and team members don't realize a conversation exists until it's resolved.
- Comment threads become team-visible instead of hidden on specific Notion pages
- Reduces duplicate questions and decisions by centralizing comment discussions
- Team members can contribute feedback without needing to check Notion constantly
- Creates a record of all discussions in Slack for easier reference later
Setup
Build it in a few focused steps.
- 1Connect your Notion workspace and Slack account to Notis.
- 2Create an automation with the prompt: 'When a new comment is added to my main project Notion pages, post the comment, the page it's on, the author, and a link to the Notion page in the discussions channel.'
- 3Select 'New Comment' as your trigger and scope to pages you want to monitor.
- 4Specify the Slack channel for receiving comment posts.
- 5Test by adding a comment to a monitored Notion page and verifying it appears in Slack.
Questions about this workflow
Can I follow entire comment threads or just individual comments?
This automation posts individual comments as they're created. Notis will post each comment separately to build the thread in Slack.
What if comments are sensitive or internal?
Scope the automation to only specific high-visibility pages. Comments on private pages can stay private in Notion.
Will team members see replies to comments in Slack too?
Yes, if they reply in Notion. Each new comment (including replies) posts to Slack, building a visible thread.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Notion to Slack. A trigger fires from one place; an action lands in another.
Notion triggers
Slack actions
All Page Events
Triggers when any Notion page is created or updated across the workspace.
Set snooze duration
Deprecated: turns on do not disturb mode for the current user, or changes its duration. use `set dnd duration` instead.
Comment Created
Triggers when a new comment is created in Notion. Optional `page_id` filter scopes to comments on a specific page. When omitted, fires for any new comment in the workspace the integration has access to. Requires the 'Read comments' capability on the Notion integration. If a connection was authorized before that capability was enabled, the user must re-authorize the connection for comment events to flow.
Add a custom emoji to a Slack team
Deprecated: adds a custom emoji to a slack workspace given a unique name and an image url. use `add emoji` instead.
New Comment
Triggers when a new comment is added to a specified Notion block or page.
Add an emoji alias
Adds an alias for an existing custom emoji in a slack enterprise grid organization.
Database Created
Triggers when a new Notion database (the container) is created. A database is the post-2025-09-03 container that holds one or more data sources. This trigger fires for the container's creation event (`database.created`), distinct from `NOTION_DATASOURCE_CREATED` which fires when a new data source is added to an existing database. Most customers calling Notion's `POST /v1/databases` (the legacy API) or creating a database via the Notion UI will see this event. Adding a new data source to an existing database fires `data_source.created` instead — use `NOTION_DATASOURCE_CREATED` for that. Notion's payload puts `entity.type: "block"` (the container is a `child_database` block in the content tree) and `entity.id` is the database id.
Add a remote file
Adds a reference to an external file (e.g., google drive, dropbox) to slack for discovery and sharing, requiring a unique `external id` and an `external url` accessible by slack.
Data Source Created
Triggers when a new Notion data source is created. Fires workspace-wide. The payload's `data.parent` carries the data source's tree parent (typically the teamspace) for downstream filtering. A single template-based database creation can fire multiple `data_source.created` events at once — one per data source the template instantiates.
Add a star to an item
Stars a channel, file, file comment, or a specific message in slack.
Data Source Schema Updated
Triggers when a Notion data source's schema is updated. Fires on column add / remove / rename. Payload includes `data.updated_properties: [{id, name, action}]` so consumers can discriminate the kind of change downstream. Optional `data_source_id` filter scopes to schema changes on a single data source. When omitted, fires for any schema change in the workspace the integration has access to. Note: adding a column also fires `page.properties_updated` once per existing row in the data source. Customers wanting a single structural-change signal should use this trigger.
Add call participants
Registers new participants added to a slack call.
New Page
Triggers when a new page is added to a Notion database.
Add emoji
Adds a custom emoji to a slack workspace given a unique name and an image url; subject to workspace emoji limits.
Page Added to Page
Fires when a new subpage (a `child_page` type block) is added under a specified parent Notion page.
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
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