Open source on GitHub

Understand your users
Reach them everywhere

A customer data platform that ingests events, builds unified profiles, and delivers targeted messages across channels.

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Open source Self-hostable GDPR ready

Trusted by product teams

Acme Corp

Meridian

Volta

Sablier

Edain

SDKs

Integrate in minutes, not days.

Native SDKs for every platform your team ships to, and server libraries for every language you write in.

Client SDKs — 5 platforms

Web

javascript · typescript

Android

kotlin · java

iOS

swift · objective-c

React Native

javascript · typescript

Flutter

dart

Server SDKs — 16 languages

typescript

python

rust

java

kotlin

swift

ruby

php

scala

c++

dart

obj-c

// Send events in a batch
cotton.track([
  {
    event: "purchase",
    distinctId: "user_42",
    properties: {
      amount: 49.99,
      currency: "USD"
    }
  }
])

# Send a push notification
cotton.notifications.send({
  "channel": "push",
  "to": { "distinct_id": "user_42" },
  "template": "order_shipped",
  "data": {
    "order_id": "ord_1284",
  },
})

# Identify a user and create a campaign
cotton.identify(
  external_id: "user_42",
  properties: { plan: "pro", region: "us" }
)

campaign = cotton.campaigns.create(
  name: "Winback - inactive 30d",
  audience: { segment: "inactive_30d" },
  message: { channel: "email", template: "winback_v2" },
  schedule: { send_at: "2026-05-01T09:00:00Z" }
)
puts campaign[:id]

Platform

Everything your team needs, nothing it doesn't.

One platform for the full user data lifecycle — from first event to targeted message.

Event Ingestion

Batch up to 1,000 events per request. Auto-enriched with geo, user-agent, and bot signals the moment they arrive.

Identity Resolution

Anonymous events merge into identified profiles automatically. One complete timeline per user, no gaps.

Analytics Insights

Trends, funnels, retention, and segmentation — with breakdowns, filter groups, and flexible aggregations.

Multi-Channel Campaigns

Push, WhatsApp, Email, SMS, and Webhooks — all from a single campaign composer with delivery tracking.

Device Management

Privacy First

Soft-delete everywhere, project-scoped API keys, and GDPR-safe data handling. Your users' data stays yours.

Analytics

Four ways to understand what's really happening.

Every insight type shares the same filter model — build a segment once, apply it anywhere.

Trends

Time-series charts of event counts and aggregations. Drill down by hour, day, week, or month. Break down by up to 5 properties.

hourly · daily · weeklybreakdowns7 aggregations

Funnel

Measure conversion through up to 20 sequential steps. Set a conversion window, see average time between steps, and spot where users drop off.

up to 20 stepsconversion windowstep timing

Retention

Cohort-based retention heatmap. Define any start and return event. Group cohorts by day, week, or month and track how well you keep users coming back.

custom start eventcohort heatmapbreakdowns

Segmentation

A single aggregate number for any time range — perfect for KPI tiles and scorecards. Combine with Segment Users to export the exact audience that drove a metric.

KPI tilesaudience exportall aggregations

Campaigns

One composer. Every channel.

Schedule messages across seven channels from a single campaign — with per-recipient delivery tracking on every send.

Android

iOS

Web Push

SMS

Webhook

Per-recipient SENT · RECEIVED · CLICKED · DISMISSED · FAILED

Scheduled delivery, polled every 30s

Firebase FCM for push

Understand your users Reach them everywhere

Integrate in minutes, not days.

Everything your team needs, nothing it doesn't.

Four ways to understand what's really happening.

One composer. Every channel.

Ready to understand your users?

Understand your users
Reach them everywhere