Codex App themes to preview, refine, and make your own.
Explore readable color and font directions in a realistic Codex Chat workspace, with coordinated Light and Dark versions for every theme. Then use the local builder to validate and create a portable CodexThemes theme string.
I rebuilt the theme browser around a denser palette list and a more faithful Codex workspace preview.
The selected theme now updates navigation, conversation surfaces, diff colors, active states, and the composer in one view.
Edited 7 files
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What you can evaluate here
Palette balance, Chat surfaces, semantic diff colors, UI/code font choices, and WCAG body-text contrast.
What the copied string means
codex-theme-v1 is the CodexThemes validation and preview contract—not an OpenAI-owned format. Official documentation does not currently publish a stable import-string contract.
Choose the right workflow
Need wallpaper and transparent panels instead?
That is a Dream Skin workflow, not a native appearance palette. Compare the capabilities and risks before making local changes.