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Codex Theme

Codex × ChatGPT inspired theme for the Hermes Desktop chat: dual light/dark palettes that follow the system appearance, graphite-on-paper typography with a 1.625 root line height (measured from ZCode's chat body) and content-spacing presets (1.5/1.625/1.75), the OpenAI radius scale (inline 4px / rows 8px / controls 10px / cards 12px / composer 20px), hairline borders instead of shadows, and an 880px reading column with 768/880/992px presets. Settings → Plugins → Codex Theme offers appearance mode, reading width, content spacing, text & code font presets, user/assistant chat bubble colors and a bilingual (EN/中文) UI as native controls; the theme paints theme-level tokens only and never writes user-configurable settings such as --chat-text-scale. v1.2.0 is a compliance release — the composer-drag and input-focus-guard features of the v1.1 line were removed because they patched prototypes and captured global events, which catalog rule 8 forbids.

Good to know before installing

No network calls, no telemetry, no credentials; registers only through the Desktop plugin SDK (THEMES_AREA, PALETTE_AREA, ctx.registerSettingsPage, ctx.i18n), switches the active theme to Codex once on first install, and keeps its preferences in plugin-scoped ctx.storage.

From the plugin's catalog listing.

How to install

  1. Install it. Hermes asks for any API keys it needs, then asks whether to turn it on.
    hermes plugins install codex-theme
  2. Said no? Turn it on later:
    hermes plugins enable codex-theme
  3. Restart Hermes so it loads the plugin.

Some plugins also need a sign-in or settings: see Full setup & settings. Memory plugins ask whether to become your memory provider instead. Steps follow the official plugins guide (opens in a new tab).

Category
Hermes Desktop add-ons
Maintained by
hey-yx (Community)
Needs
No API keys declared
Needs Hermes
0.22.0 or newer
Version
1.2.0
In the catalog
2026-10-24, updated 2026-10-25

Full setup & settings ↗Source code ↗

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