# Build

Develop Cyoda applications — tier-agnostic patterns that work on any runtime.

Cyoda applications are **digital twins**: the same code runs on every
storage tier, from in-memory dev through Cassandra at enterprise
scale. Pages in this section cover the patterns — entity modeling,
workflows, external processors, testing — independent of where your
app runs.

Where to next:

- [Modeling entities](./modeling-entities/)
- [Working with entities](./working-with-entities/)
- [Workflows and processors](./workflows-and-processors/)
- [Client compute nodes](./client-compute-nodes/)
- [Testing with digital twins](./testing-with-digital-twins/)