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

# Runtimes

> Install and manage simulator runtimes

Runtimes are the OS images (iOS, tvOS, watchOS, visionOS) that simulators use. You need a runtime installed before you can create or boot simulators for that platform.

## Core Actions

| Action                         | Command                                        |
| ------------------------------ | ---------------------------------------------- |
| List installed runtimes        | `flowdeck simulator runtime list`              |
| See downloadable runtimes      | `flowdeck simulator runtime available`         |
| Install a runtime              | `flowdeck simulator runtime install iOS 18.1`  |
| Remove a runtime               | `flowdeck simulator runtime delete "iOS 17.2"` |
| Prune simulators for a runtime | `flowdeck simulator runtime prune "iOS 18.0"`  |

<Tip>
  See the [Runtimes command reference](/cli/commands/simulator/runtimes) for all flags and filters.
</Tip>