About Terminfo.dev

Terminfo.dev is the "caniuse.com for terminal emulators" — a feature support matrix showing which terminal capabilities are supported by each terminal backend, based on automated testing rather than self-reported specs.

How Data Is Collected

All data is generated by Termless census probes. Each probe:

1. Sends a specific ANSI escape sequence to a terminal backend
2. Reads back the terminal state (buffer, cursor, cell attributes)
3. Compares the actual result against the expected behavior
4. Records yes, no, or partial support with notes on deviations

No manual testing. No self-reported capabilities. Fully reproducible.

Backends Tested

Backend	Engine	Description
xterm.js	@xterm/headless	The most widely used web terminal emulator
Ghostty	ghostty-web WASM	Mitchell Hashimoto's GPU-accelerated terminal
Ghostty Native	libghostty-vt (Zig)	Native Ghostty via Zig N-API bindings
vt100	Pure TypeScript	Termless's built-in zero-dependency emulator
vt100-rust	Rust vt100 crate (napi-rs)	Rust VT100 parser via native bindings
WezTerm	wezterm-term (napi-rs)	Broadest protocol support: sixel, semantic prompts
Alacritty	alacritty_terminal (napi-rs)	Rust parser with strong reflow
libvterm	neovim/libvterm (WASM)	Neovim's C VT parser via Emscripten
Kitty	kitty (C, GPL source)	Kitty's parser built from source
Peekaboo	OS automation	Tests against a real terminal app (macOS)

Feature Categories

• SGR — Text styling: bold, italic, underline variants, colors, strikethrough
• Cursor — Positioning, visibility, save/restore
• Text — Basic output, wrapping, wide characters (emoji, CJK), tabs
• Erase — Line and screen clearing operations
• Modes — Alternate screen, bracketed paste, mouse/focus tracking, auto-wrap
• Scrollback — Scroll buffer behavior, reverse index, total line tracking
• Reset — SGR reset, full terminal reset (RIS), programmatic reset
• Extensions — Window title, kitty keyboard/graphics, sixel, OSC 8 hyperlinks, text reflow

Powered by Termless — Playwright for terminals.