| Class | Superclass | Slots |
 256color | filter-writer |
| Word | Stack effect |
 256colors | ( -- value ) |
 <256color> | ( stream -- 256color ) |
| color>256color | ( color -- 256color ) |
| color>background | ( color -- string ) |
| color>foreground | ( color -- string ) |
| color>rgb | ( color -- rgb ) |
| intensities | ( -- value ) |
| Word | Stack effect |
| 256color? | ( object -- ? ) |