The short answer
Yes. Rebuilt or re-downloaded automatically when needed.
What is it?
Debug symbols Xcode copies from each version of watchOS running on an Apple Watch you have debugged on, one folder per version and build. Old versions stay here after the watch has been updated.
What happens if you delete it?
Xcode copies the symbols again the next time a watch running that version is used for debugging, which takes a while over the paired iPhone. No project data is involved.
How to remove it properly
Quit Xcode, open ~/Library/Developer/Xcode/watchOS DeviceSupport with Go › Go to Folder… in Finder, and move the folders for watchOS versions you no longer use to the Trash, keeping the newest one.
Quit the app that uses it, then move it to the Trash. Empty the Trash when you’re sure.
- MoreRoom keeps the newest 1 and suggests the older ones.
How MoreRoom helps
MoreRoom recognises this item, shows its real size and when it was last used, and labels it “Safe to remove”. In the free version you can move it to the Trash in one click, with Undo; Pro collects every safe item at once.
Frequently asked questions
Is it safe to delete watchOS DeviceSupport in Xcode?
Yes. Rebuilt or re-downloaded automatically when needed. Xcode copies the symbols again the next time a watch running that version is used for debugging, which takes a while over the paired iPhone. No project data is involved.
Will watchOS Device Support (old versions) come back after I delete it?
Yes. Xcode copies the symbols again the next time a watch running that version is used for debugging, which takes a while over the paired iPhone. No project data is involved.
How do I remove watchOS Device Support (old versions) properly?
Quit Xcode, open ~/Library/Developer/Xcode/watchOS DeviceSupport with Go › Go to Folder… in Finder, and move the folders for watchOS versions you no longer use to the Trash, keeping the newest one.