Intercom

Promptfree, for everyone, and the only version there is

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Build me a live chat widget and a shared inbox behind it. Rent the AI part.

STACK
- A vanilla JS widget under 15KB gzipped, loaded async, in a shadow root so no CSS leaks either way
- Node with Fastify and WebSockets, SQLite for storage

THE WIDGET
- Shadow DOM, all styles scoped, and a documented CSS custom property API for colours
- Falls back to polling if the socket cannot connect
- Conversation id in localStorage, never a cookie, so a returning visitor keeps their thread

THE INBOX
- One conversation per visitor, assigned to one agent at a time
- Canned replies with variable substitution
- Every message append-only; an edit is a new row referencing the old

ROUTING
- Round-robin among agents marked available, with a per-agent open-conversation cap
- Unassigned queue visible to everyone, sorted by wait time

CONTEXT
- Accept a JSON payload of custom attributes from the host page and show it beside the conversation
- Show the last ten pages the visitor saw, if the host app sends them

OFFLINE
- Outside working hours, collect an email address and reply by mail; the same thread, a different transport

WHAT IS NOT HERE
- The AI agent, mobile SDKs and SLA reporting

Include a README on the widget size budget, the socket fallback, and the retention period for conversations.