How is a theme different from a Codex skin?

A theme is colors only (paste a string into settings). A Codex skin is a full immersive look with background art and styled chrome, sold in the Codex Skin Library.

Do I need to install anything?

No. Themes paste into Codex Appearance. Skins use the CodexSkin engine with one-click import on macOS.

Can I preview before applying?

Yes. The generator shows a live preview of your palette before you copy the theme string.

Where do I buy full Codex skins?

Browse the Codex Skin Library for ready-made immersive skins from $2.99, with Verify and Restore included.

Free Codex Theme Generator — Colors Only

Free Codex theme generator. Copy, paste, done.

Pick a refined pure-color codex theme — obsidian, violet, pine — or tune your own. Copy the codex-theme-v1 string into Codex → Settings → Appearance. No install, no code, 100% safe. Want a full character skin instead? Try the skin generator →

1 · Start from a theme

Obsidian Ember

Astral Violet

Pine Depths

Rose Quartz

Cyan Signal

Amber Study

2 · Tune colors

accent

surface

text

Live preview

◈ Codex

New task

Scheduled

Skills

Chat

codex> build the theme

Reading theme.css…

:root {

--accent: #7c5cff;

}

codex-theme-v1:{ "codeThemeId": "one", "theme": { "accent": "#7c5cff", "contrast": 48, "fonts": { "code": null, "ui": null }, "ink": "#e9e4f5", "opaqueWindows": true, "semanticColors": { "diffAdded": "#7ee6c8", "diffRemoved": "#ff8fa0", "skill": "#7c5cff" }, "surface": "#0d0a1a" }, "variant": "dark" }

Paste into Codex → Settings → Appearance → Import. codeThemeId is locked to a built-in so import never fails.

Guide

How to customize your Codex theme

Theme vs skin — which do you want?

A codex theme changes colors and fonts — surface, accent, text, diff highlighting. It's native, instant, and free. A full codex skin goes further: a character banner, styled sidebar and persona text across the whole window. If you just want a calm, readable palette, a theme is all you need. If you want the immersive look people share online, build a skin instead.

Install a codex-theme-v1 string

Open Codex, press Cmd+,, go to Appearance, click Import, and paste the codex-theme-v1:… string from the studio above. Changes apply live.

Fix: "codex theme not showing after import"

Almost always a bad codeThemeId. The importer silently rejects ids that aren't built in. Our generator locks that field to a valid built-in (like one or catppuccin) while keeping all your custom colors — so your codex theme imports every time.

Codex theme FAQ

Is the Codex theme generator free?

Yes. Generating and exporting a pure-color codex theme string is completely free, forever. You only pay if you want a full immersive skin with a character banner.

Does a Codex theme need an install?

No. A codex theme uses Codex's native Appearance settings — you just paste the string. No engine, no download, no CDP. It's the safest way to customize Codex.

Can I share my Codex theme?

Yes — the codex-theme-v1 string is portable. Send it to a teammate and they paste it into their own Codex settings.

What's the difference between a codex theme and a codex skin?

A theme is colors and fonts (native, free). A skin is a full-window character banner + styled layout (installed via a safe local engine). See the skin generator →

Free Codex theme generator. Copy, paste, done.

1 · Start from a theme

2 · Tune colors

Themes that protect your focus.

Obsidian Ember

Astral Violet

Pine Depths

Rose Quartz

Cyan Signal

Amber Study

Readable before decorative

Native & shareable

Instant & zero-risk

How to customize your Codex theme

Theme vs skin — which do you want?

Install a codex-theme-v1 string

Fix: "codex theme not showing after import"

Codex theme FAQ

Or go all the way — a full Codex skin.