What is Swatch mode?
Swatch is Spoak's material and color curation mode. Use it to build a swatch tray: a curated arrangement of tiles, wallpapers, fabrics, paint colors, fixtures, and natural elements that communicate the direction you're going for in a space.
It's designed for the early stages of a design, when you're exploring what feels right before committing anything to a mockup.

Swatch vs. Mockup
Swatch is for exploring the material palette. Mockup is for seeing how those materials and products look in a room. Most designers start with a swatch tray to align on direction, then bring those choices into a mockup to see them in context.