Crumb

Crumb is a lightweight, self-hosted event tracking pipeline. Drop in a tiny SDK, send events from your app, and forward them wherever you want. No dashboards, no billing surprises—just data you own.

Why Crumb?

• Simple track() events
• Built with Elixir for speed and reliability
• Forward events to any service (webhooks, GA, etc.)
• Self-hosted, open-source, and easy to extend

Quickstart

0. Install

Get the code. Use mise, asdf or similar to install from .tool-versions.

git clone https://github.com/mrdougwright/crumb
cd crumb
mise install

1. Run the Crumb Server

mix deps.get
iex -S mix phx.server

2. Build JS SDk

cd sdk/js
npm run build
cd ../..

3. Run JS SDK test

# from root (crumb)
npx serve .

Go to localhost:3000 and navigate to sdk-js-test page. Click the button, see event sent (browser console) and received (server shell)!