Maintain an Amplitude cohort with Slack reactions
A simple reaction can keep a research or beta cohort up to date.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Update Amplitude Cohort Membership
Incrementally update cohort membership by adding or removing ids. this action allows you to: - add new ids to an existing cohort - remove ids from an existing cohort - perform multiple operations in a single request
Why this helps
Cohort lists drift because updates depend on someone remembering to edit them later.
- Keeps selected cohorts current
- Turns lightweight team signals into structured updates
- Reduces spreadsheet maintenance
Setup
Build it in a few focused steps.
- 1Connect Slackbot and Amplitude in Notis once.
- 2Create an automation named Reaction cohort upkeep.
- 3Tell Notis to read the reacted message, identify the user IDs it explicitly names, and add or remove them from the specified Amplitude cohort according to the reaction instruction.
- 4Pick Message Reaction Added as the trigger.
- 5Choose a report channel and test with one real reaction.
Questions about this workflow
Can the same workflow remove members too?
Yes. Define a separate reaction convention for removal and ask Notis to apply it.
What happens when no user ID is present?
Notis can report the missing identifier and skip the cohort change.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slackbot to Amplitude. A trigger fires from one place; an action lands in another.
Slackbot triggers
Amplitude actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Check Amplitude Cohort Status
Check the status of a cohort export request. this action allows you to: - poll the status of an in-progress cohort download request - determine if a cohort is ready for download
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Create Amplitude Event Category
Create a new event category in amplitude. this action allows you to: - create a new event category to organize event types - validate category name before creation key features: - creates event categories for organizing events - returns success/failure status
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Create Amplitude Event Type
Create a new event type in amplitude. this action allows you to: - define a new event type with various properties - associate the event with a category - add metadata like description, tags, and owner key features: - creates trackable events in your amplitude project - supports full event type configuration
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Delete Amplitude Event Category
Delete an event category from amplitude. this action allows you to: - delete an existing event category - remove category organization from events key features: - permanently removes event categories - returns success/failure status
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Delete Amplitude Event Type
Delete an event type from amplitude. this action allows you to: - remove an event type from your project - mark live events as deleted - remove planned events from the tracking plan key features: - different behavior based on event status (live, planned, etc.) - returns success/failure status
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Request Amplitude Cohort
Get a single cohort by id and initiate download. this action allows you to: - request a specific cohort from amplitude - optionally include user properties in the response - start the asynchronous download process key features: - supports filtering by specific user properties - returns a request id used for polling status and downloading - supports eu data residency
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Get Amplitude Event Categories
Get event categories from amplitude. this action allows you to: - get all event categories in your project - get a specific category by name
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Get Amplitude Event Type
Get a specific event type from amplitude by name. this action allows you to: - retrieve detailed information about a single event type - get all properties and metadata for the event key features: - retrieves comprehensive event type details - returns metadata like category, description, and settings - supports lookup by exact event name
Connect any two apps with Notis in the middle.
Slackbot and Amplitude, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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