Slate Blue vs White — Difference, Contrast & Harmony

Slate Bluenearest vs Whiteexact

#666ED2 · #FFFFFF

Four independent scores (read the one that fits your goal): Readability 59/100 (aa large) · Harmony 100/100 (triadic) · Distinguishable 85/100 (easy to tell apart) · Match 0/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.

Readability59AA Large

The quick brown fox jumps over the lazy dog.

AA Large4.4:1

Harmony100Triadic

Triadic

124° apart

Distinguishable85Easy to tell apart

normal

tritanopia

ΔE 77 (42 under CVD)

Match0Different

ΔE 77 — different

How different are Slate Blue and White?

Slate Blue and White are very different (ΔE 77). They have distinctly different hues (124° apart) and their lightness is different, giving a clear light/dark split.

Can you read one on the other?

Slate Blue text on White: 4.44:1 (AA Large); White text on Slate Blue: 4.44:1 (AA Large). Neither meets AA at body size — nudging one color to #656DD1 clears it.

Common questions

Do Slate Blue and White go well together?

Triadic — triadic — a recognised, balanced pairing (harmony 100/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.

Is Slate Blue readable as text on White?

Not at body size — the best direction is only 4.4:1, below the 4.5:1 minimum. Nudging one colour to #656DD1 clears AA.

What is the colour difference (ΔE) between Slate Blue and White?

Their CIE76 ΔE is about 77 — very different.

Are Slate Blue and White the same colour?

clearly different colours (ΔE 77).

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