Rapid.io is a cloud-hosted service that allows app developers to build realtime user interfaces without having to worry about the underlying infrastructure. It works as a non-relational data store accessible from client-side code. Clients can subscribe to a set of data and receive updates in realtime.

Typical use cases include
- Collaborative Apps
- Messengers
- Live Dashboards
- IoT Apps
- Realtime Geolocation Apps
- Online Games