# Density

> Density builds radar-based occupancy sensors and a workplace analytics platform that measures how people use physical space without cameras or PII. The v3 Public API exposes real-time occupancy and presence, historical space metrics, spaces/doorways/sensors/labels resources, sensor and space health, WebSocket live streams, and wayfinding display tokens.

Authentication: OAuth 2.0 client-credentials (Auth0-backed, token endpoint https://api.density.io/v3/oauth/token) or a static Bearer API token. Base URL: https://api.density.io/v3. Rate limit: 15 req/s per IP, burst 100, at the edge.

## APIs
- [Density Public API v3](https://developers.density.io/docs): Real-time occupancy/presence, historical metrics, spaces/sensors management, WebSocket streams.

## Docs
- [Developer Portal](https://developers.density.io/): Home for Density API documentation.
- [API Reference](https://developers.density.io/docs): Full v3 endpoint reference (Redocly).
- [Quick Start](https://developers.density.io/quick_start/): Create credentials and make your first request.
- [Key Concepts](https://developers.density.io/key_concepts/): Spaces, time, and health model.
- [Understand Health](https://developers.density.io/understand_health/): Sensor Health and Space Health.
- [WebSockets](https://developers.density.io/websockets/): Live floor-presence and space-occupancy streams.
- [FAQs](https://developers.density.io/faqs/): Frequently asked questions.

## Operations
- [Status Page](https://status.density.io): Live component status (Atlassian Statuspage).
- [Sign Up / Atlas](https://atlas.density.io/): Manage the org and create API credentials.
- [Pricing](https://www.density.io/pricing): Product and pricing information.
- [Support](https://support.density.io/hc/en-us): Help center.

## Legal
- [Terms of Service](https://www.density.io/legal/terms-of-service)
- [Privacy Policy](https://www.density.io/legal/privacy-policy)

## Artifacts
- [Authentication](authentication/density-authentication.yml)
- [Conventions](conventions/density-conventions.yml)
- [Lifecycle](lifecycle/density-lifecycle.yml)
- [Error Catalog](errors/density-problem-types.yml)
- [WebSocket Events](asyncapi/density-websockets-events.yml)
- [Data Model](data-model/density-data-model.yml)
- [Packages](packages/density-packages.yml)