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Left Half

Right Half

Combo Reference (Promethium Layout)

Essential Navigation

Y + U → Escape
P + L → Enter
W + G → Hyper (Shift+Ctrl+Alt+GUI)

Letter & Modifier Combos

' + . → Meh (Shift+Ctrl+Alt)
💡 Promethium Layout Features
  • • 3x6+3 split layout optimized for ergonomics
  • • Promethium alphabet layout for balanced finger usage
  • • Home row modifiers (GACS pattern: S/N/T/H on left, C/I/E/A on right)
  • • Six dedicated layers accessible via thumb keys
  • • Strategic combo placements for missing letters and modifiers

Key Features of This Layout

Color Legend:

Home row with modifiers (GUI/Alt/Ctrl/Shift)
Standard alphanumeric keys
Thumb keys (Layer switches)
Combo keys (see Combo Reference above)

Layout Benefits:

  • • Compact 42-key ergonomic layout
  • • Promethium alphabet layout (optimized letter placement)
  • • Home row modifiers for easy access
  • • Layer-based number/symbol access
  • • 6 layers for complete functionality

How to Change Between Layers

1 On Your Physical Keyboard

Hold
R key (left thumb) → Navigation layer
Arrow keys and navigation controls
Hold
Tab key (left thumb) → Mouse layer
Mouse movement and clicks
Hold
Backspace (right thumb) → Symbols layer
Special characters
Hold
Space key (right thumb) → Numbers layer
Numeric keypad layout

2 In This Visualizer

Click
Layer buttons above → Switch views
See what each layer looks like
Hover
Over any key → See details
Keys lift up to show they're interactive
💡 Tip: The visualizer shows the final result - on your keyboard, you hold thumb keys to temporarily access other layers while typing

Key Principle: Tap thumb keys for their primary function (Space, etc.) • Hold thumb keys to activate layers on the opposite hand

Compare Layout Versions:

Silakka54 Layout Corne (Colemak-DH) Corne (Gallium) Corne (Enthium) Current: Corne (Promethium) NEW

Quick Reference:

Home row modifiers: GUI (S/C) | Alt (N/I) | Ctrl (T/E) | Shift (H/A)

Promethium Layout (Reddit) • Corne Keyboard • Alt Layout Guide
Built with Claude Code by itman.fyi