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Themes

Regenerator 2000 ships with 9 built-in color themes. You can switch between them in File → Settings (Alt+P or Ctrl+,) under the Theme option.

Available Themes

The default theme. A dark theme with vibrant accent colors (purple, pink, cyan). Popular across many editors.

Dracula

A popular low-contrast dark palette by Ethan Schoonover. Easy on the eyes for long sessions.

Solarized Dark

The light variant of Solarized. Good for bright environments or high-ambient-light setups.

Solarized Light

A retro-groove color scheme with warm, earthy tones (orange, yellow, aqua).

Gruvbox Dark

The light variant of Gruvbox. A warm, creamy background with the same earthy accent colors. Great for bright environments.

Gruvbox Light

A classic dark theme with bold, saturated accent colors. Originally from Sublime Text.

Monokai

An arctic, north-bluish color palette. Low contrast with a cool, muted aesthetic inspired by the polar night.

Nord

The darkest flavor of Catppuccin — a soothing pastel theme with warm tones on a deep background.

Catppuccin Mocha

The light flavor of Catppuccin — pastel colors on a warm, creamy background. Great for daytime use.

Catppuccin Latte

How to Change the Theme

  1. Open File → Settings (Alt+P or Ctrl+,).
  2. Navigate to the Theme option.
  3. You can change the theme in two ways:
    • Press Left / Right to cycle through themes instantly (live preview).
    • Press Enter to open the theme selector popup and pick from the full list.
  4. Choose a theme and press Enter.

The theme is saved globally and persists across sessions and projects.

Tip

All themes support true color (24-bit RGB). For the best visual experience, use a terminal with true color support. See the Recommended Terminals section.

Custom Themes

You can create your own themes or override any built-in theme by placing a theme-*.toml file in the application config directory.

Config directory location

Platform Config directory
macOS ~/Library/Application Support/regenerator2000/
Linux ~/.config/regenerator2000/
Windows C:\Users\<User>\AppData\Roaming\regenerator2000\config\

Getting started

The easiest way to create a custom theme is to start from the built-in files:

  1. Dump all built-in themes to the config directory:

    # macOS
regenerator2000 --dump-theme-files ~/Library/Application\ Support/regenerator2000/

# Linux
regenerator2000 --dump-theme-files ~/.config/regenerator2000/

# Windows (PowerShell)
regenerator2000.exe --dump-theme-files $env:APPDATA\regenerator2000\config\

This writes every theme-*.toml to the destination folder and exits.

  1. Edit an existing file or create a new one (e.g. theme-green_screen.toml):

    name = "Green Screen"
base = "Solarized Dark"
background = "#003300"
foreground = "#33FF33"
border_active = "#33FF33"
border_inactive = "#116611"

  2. Launch Regenerator 2000 — your custom theme appears in Settings → Theme.

How it works

  • Theme files must be named theme-<name>.toml (e.g. theme-green_screen.toml).
  • The name field is the display name shown in the theme selector.
  • The optional base field names a built-in theme to inherit from. Any color field you omit is filled in from the base (defaults to "Solarized Dark" when not specified).
  • A custom theme with the same name as a built-in theme replaces the built-in.
  • Colors use hex format: "#RRGGBB".

Tip

Partial themes are the recommended approach — only override the colors you care about and inherit the rest from a base theme. This makes your theme file short and easy to maintain.

TOML schema reference

Every theme-*.toml file has the following top-level keys:

Field Type Description
name string Required. Display name shown in the theme selector. Must be unique.
base string Optional. Name of a built-in theme to inherit from. Defaults to "Solarized Dark".
color fields string Optional. Hex color ("#RRGGBB"). See below for the full list.
hex_color_palette array of strings Optional. 18-entry array of hex colors for the Hex Dump palette.

Color fields

All color fields accept hex strings in #RRGGBB format. Omitted fields inherit from the base theme.

Base colors: background, foreground, border_active, border_inactive, selection_bg, selection_fg, block_selection_bg, block_selection_fg, status_bar_bg, status_bar_fg

Code / Disassembly: address, bytes, mnemonic, operand, label, label_def, comment, arrow, collapsed_block, collapsed_block_bg

Hex View: hex_bytes, hex_ascii

UI Elements: dialog_bg, dialog_fg, dialog_border, menu_bg, menu_fg, menu_selected_bg, menu_selected_fg, menu_disabled_fg, sprite_multicolor_1, sprite_multicolor_2, charset_multicolor_1, charset_multicolor_2

Highlights: highlight_fg, highlight_bg, error_fg

Block Types (fg/bg): block_code_fg, block_code_bg, block_scope_fg, block_scope_bg, block_data_byte_fg, block_data_byte_bg, block_data_word_fg, block_data_word_bg, block_address_fg, block_address_bg, block_petscii_text_fg, block_petscii_text_bg, block_screencode_text_fg, block_screencode_text_bg, block_lohi_fg, block_lohi_bg, block_hilo_fg, block_hilo_bg, block_external_file_fg, block_external_file_bg, block_undefined_fg, block_undefined_bg, block_splitter_fg, block_splitter_bg, minimap_cursor_fg