#333561
Closest named color: Prussian Blue (#1D3557). oklch(35% 0.076 279.7), rgb(51, 53, 97).
Aa
White text reads best on this color (11.52:1).
About this color
#333561 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.076 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.037 away. White text reads best on it, at 11.52:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.52:1 |
Values
| HEX | #333561 |
| RGB | rgb(51, 53, 97) |
| HSL | hsl(237, 31%, 29%) |
| OKLCH | oklch(35% 0.076 279.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #333561 | 11.52:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #333561 | 1.82:1 | Fails | Lc 7.4 | Not readable |
| #333561 text on white | 11.52:1 | AAA | Lc 96.4 | Preferred for body text |
| #333561 text on black | 1.82:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D7EE
oklch(88.4% 0.032 279.8)
-
Step 300
300
#B9BDE6
oklch(80.9% 0.058 280.6)
-
Step 400
400
#959BD9
oklch(70.8% 0.091 279.5)
-
Step 500
500
#7C81CE
oklch(63.2% 0.115 279.7)
-
Step 600
600
#6669BB
oklch(55.7% 0.126 279.9)
-
Step 700
700
#5457A1
oklch(49.1% 0.117 279.4)
-
Step 800
800
#454783
oklch(42.6% 0.098 279.9)
-
Step 900
900 (this color)
#333561
oklch(35% 0.076 279.7)
-
Step 950
950
#22243D
oklch(27.1% 0.046 279.3)
#333561 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #243B63 | 0.025 |
| Deuteranopia (no green cones) | #213860 | 0.026 |
| Tritanopia (no blue cones) | #243E46 | 0.066 |
| Achromatopsia (no color) | #393939 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333561
#333561
oklch(35% 0.076 279.7)
- #443B00
#443B00
oklch(35.1% 0.073 99.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #333561, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.057
- Space Cadet #2B2D42 ΔE 0.059
- Gunmetal #293241 ΔE 0.060
- Marine #042E60 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.062
Use #333561 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.