Download the test build
Get the versioned DMG from our public object storage and verify the published SHA-256 checksum.
macOS development preview
Try the themes.
Skip the account.
This early build is for demand and compatibility testing. It uses an ad-hoc development signature and is not yet notarized by Apple.
macOSApple Silicon + IntelOfficial Codex app
EARLY ACCESSDMG
Codex Skin Studio
Development build · v0.2.0 · 85.7 MB
Unsigned / not notarized
Use only for testing
Know what you are opening
Only download from this site's official object-storage link. If macOS reports an unidentified developer, confirm the app from System Settings → Privacy & Security only after checking the published checksum. A signed and notarized build will come after real usage is validated.
Test installation
From download to theme
in four clear steps.
Open from Finder
Move the app to Applications. Because this preview is not notarized, macOS may ask you to confirm it under Privacy & Security.
Choose and apply
Open Skin Studio, choose a launch theme, and allow the official Codex app to restart on the first application.
Pause or restore
Remove the visual runtime at any time. Your Codex projects, conversations, and settings remain untouched.
What the companion does
Local by design.
Easy to undo.
01Verifies the official appChecks OpenAI's signature and bundle identifier before connecting.
02Keeps themes data-onlyRemote assets, theme JavaScript, imports, and path escapes are rejected.
03Leaves your data aloneDoes not modify the official bundle, projects, conversations, or account settings.
04Restores the native experiencePause the theme or relaunch Codex normally from the companion.