Adirondack Blue

Soft rather than pale-to-invisible - the blue undertone is faint but genuinely there. N480-5 in the Behr range.

Light reflectance measures 429.0, which is enough to keep a room bright without bouncing light around. Chroma 8.4 keeps the blue undertone present without letting it run the room.

South light flatters it. In a north-facing room it can turn cold, so sample that wall first. A dependable choice where a room gets good natural light and a pure white would feel sterile. Dunn-Edwards Silver Spoon pairs well as a second surface - close enough in feel to belong in the same room, far enough in lightness to read as two distinct walls (about 363.9 points apart on the reflectance scale).

Vista Paint Ocean Storms (0506) matches it closely enough that no one will tell them apart on a wall. Eggshell is a common middle ground here - enough durability for a lived-in room without the sheen that would draw attention to wall imperfections.

Nothing Behr makes is lighter: of their 4,550 colors, this is the top of the scale. Behr lists it in the N codes, alongside 332 other colors.