Appearance
Standard fg colors (SGR 30-37)
ESC [ 30–37 mSGR 30-37 set the foreground text color to one of 8 standard colors: black (30), red (31), green (32), yellow (33), blue (34), magenta (35), cyan (36), white (37). Universally supported. The actual displayed color depends on the terminal's color scheme — "red" in one theme may look very different from "red" in another.
How this is tested: Send
\x1b[31mX (red), verify the cell's foreground color has a red channel > 100.Analysis2026-03-26
Supported by all 8 tested terminals — universal adoption. Part of the Core TUI baseline.
Supported by 11 of 13 backends (85%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | 1.112.0 | ✓ yes | |
| Warp | 0.2026.03.18.08.24.03 | ✓ yes | |
| Cursor | 2.6.21 | ✓ yes | |
| tmux | 3.6a | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes | |
| GNU Screen | 5.0.1 | ✓ yes |
Headless Backends
Parser correctness only — a ✓ means the parser accepts the sequence.
| Backend | Version | Support | Notes |
|---|---|---|---|
| vt100 | 0.2.1 | ✓ yes | |
| vterm | 0.2.0 | ✓ yes | |
| Alacritty | 0.26.0 | ~ partial | Backend returns palette index instead of resolved RGB |
| WezTerm | 0.1.0-fork.5 | ~ partial | Backend returns palette index instead of resolved RGB |