Turn webhook events into Slack reminders automatically
External tools often send data to you when important things happen, but the data gets lost in email or integration logs. This automation lets external systems send webhooks to Notis, which creates a Slack reminder, so you're prompted immediately.
Trigger
Webhook received
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Action
Create a reminder
Creates a slack reminder with specified text and time; time accepts unix timestamps, seconds from now, or natural language (e.g., 'in 15 minutes', 'every thursday at 2pm').
Why this helps
Neurodivergent founders use multiple tools that don't integrate well. Critical events from external systems often get missed because there's no central notification mechanism.
- External events create Slack reminders instead of disappearing into logs or email
- Unifies notification channels so you don't need to check multiple systems
- Enables creative integrations with tools that don't have native Slack support
- Gives external events the same priority as Notis-native triggers
Setup
Build it in a few focused steps.
- 1Connect your Slack account to Notis.
- 2Create an automation with the prompt: 'When an external system sends me a webhook with an alert, create a Slack reminder immediately with the alert details and set it to trigger in 5 minutes.'
- 3Select 'Webhook' as your trigger kind.
- 4Notis provides you with a unique webhook URL.
- 5Configure your external system to POST JSON data to that URL when events occur, then test by triggering an event and verifying a Slack reminder appears.
Questions about this workflow
How do I tell my external system to send a webhook to Notis?
Most tools have an 'integrations' or 'webhooks' section. Add the Notis URL as a destination and configure what events should trigger it.
Can I create different reminders based on webhook content?
Yes. Your automation prompt can branch on fields in the webhook, like 'if severity is critical, remind me in 1 minute; if normal, remind in 1 hour'.
What if my webhook format changes?
Tell Notis how to handle new fields: 'extract the summary field if it exists, otherwise use the message field'. Notis is flexible about JSON structure.
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.
Connect any two apps with Notis in the middle.
Not just Notion and Slack. Any combination from 985+ integrations.
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