# Can I delete simulator runtimes in CoreSimulator/Volumes?

- URL: https://moreroom.app/folders/simulator-runtimes
- Item: Simulator runtimes
- Location: `/Library/Developer/CoreSimulator/Volumes` (items inside)
- Verdict: Review first — Might hold something you care about. Look inside before removing it.
- Comes back on its own: yes
- Typical size: 7–10 GB each
- Official command: `xcrun simctl runtime delete <runtime>`
- Source: MoreRoom rules catalogue (2026-10-17), by Yando Pte. Ltd.

## What is it?

Simulator runtimes are complete copies of iOS, watchOS, tvOS or visionOS that simulators boot from. In recent Xcode versions they are downloaded separately from Xcode, stored as disk images and mounted under `/Library/Developer/CoreSimulator/Volumes`. Each runtime typically takes 7 to 10 GB, and older ones stay installed after you update Xcode.

## What happens if you delete it?

Xcode can download a removed runtime again from Xcode › Settings › Components (several gigabytes per runtime). Simulators that used it become unavailable until it is reinstalled.

## How to remove it properly

Remove runtimes in Xcode › Settings › Components, or run `xcrun simctl runtime list` and then `xcrun simctl runtime delete <identifier>` in Terminal. These are mounted, system-managed disk images: do not drag them to the Trash, and expect the deletion to be permanent.

## Before you delete it

Keep the runtime you test on day to day, and older ones only if you support those OS versions.