# tui/backend The host backend as a keyword — the canonical capability probe. `[capabilities]`'s `:backend` carries the same value. ## Syntax

[tui/backend]

## Examples

if ([tui/backend] == :gl) {
    [gl/perspective 60.0 1.5 0.1 100.0]
} else {
    [draw/text $ctx 0 0 "3D unavailable"]
}

## Returns Keyword — `:gl` on `retro` and `hydra`; `:ansi` on `retra`. Compiled per host, so it needs no attached workspace and also answers from the standalone-workspace-less builds. ## See Also `tui/gl?`, `tui/cell-size`, `capabilities`