Native Codex themes

Free Codex themes, ready to import.

Original palettes for Codex, reviewed for the native theme format and presented with clear compatibility notes. Every theme is free to import.

Independent and unofficial. Not affiliated with or endorsed by OpenAI.

Native import format

Source-linked Skins

Restore guidance

Featured collection

Choose the atmosphere before you import.

Two formats, one standard

Import through Codex Appearance and keep native controls. The simplest path for color, contrast, and font choices.

External tools are listed separately with their original source, compatibility notes, license, risks, and a way back.

Copy a theme file and import it through Codex Appearance. No plugins, no patches.

Every theme documents the path back to a known-good default appearance.

Practical guides

Copy, import, and verify a native theme.

Understand the capability and risk difference.

Return to a known-good appearance safely.

Is CodexTheme.dev official?

No. It is an independent and unofficial collection and is not affiliated with or endorsed by OpenAI.

Are all Codex themes free?

Yes. All 24 native Codex themes are free to browse and import — no account, no payment.

Are Skins the same as native themes?

No. Skins are external tools with broader capabilities and separate compatibility and restore guidance.

No account required to browse the free collection.