> ## Documentation Index
> Fetch the complete documentation index at: https://docs.korve.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Runtime and regions

> Choose the runtime class and locality that match an application's workload.

Choose `scale-to-zero` for request-driven web applications and APIs. It runs at the global edge and
does not accept a compute region. Choose `always-on` for long-lived processes, WebSockets, or steady
background work; it runs in a selected compute region.

Databases, caches, storage, and always-on compute each publish their own supported locality catalog.
Never copy region ids from another resource type: discover the current catalog instead.

```bash theme={null}
korve regions
korve projects create --name Worker --slug worker --runtime-class always-on --region us-east
```

Project runtime class and initial region are immutable. Plan locality before creating stateful
resources, and keep compute near its database when request latency matters. See the
[Regions API](/api-reference/regions).