#33427B
Closest named color: Twilight Blue (#0A437A). oklch(39.7% 0.098 270.3), rgb(51, 66, 123).
Aa
White text reads best on this color (9.51:1).
About this color
#33427B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 9.51:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.20:1 |
| White text | 9.51:1 |
Values
| HEX | #33427B |
| RGB | rgb(51, 66, 123) |
| HSL | hsl(228, 41%, 34%) |
| OKLCH | oklch(39.7% 0.098 270.3) |
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 #33427B | 9.51:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #33427B | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #33427B text on white | 9.51:1 | AAA | Lc 91.9 | Preferred for body text |
| #33427B text on black | 2.20:1 | Fails | Lc -10.5 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AEBFF1
oklch(80.9% 0.073 270.1)
-
Step 400
400
#859CEA
oklch(70.7% 0.117 270.7)
-
Step 500
500
#6782E4
oklch(63.2% 0.15 270.1)
-
Step 600
600
#5069D1
oklch(55.6% 0.162 270.2)
-
Step 700
700
#4157B5
oklch(49.1% 0.151 270.1)
-
Step 800
800
#364793
oklch(42.7% 0.126 270.7)
-
Step 900
900 (this color)
#33427B
oklch(39.7% 0.098 270.3)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#33427B 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) | #29497D | 0.022 |
| Deuteranopia (no green cones) | #1F437A | 0.023 |
| Tritanopia (no blue cones) | #064F58 | 0.089 |
| Achromatopsia (no color) | #454545 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33427B
#33427B
oklch(39.7% 0.098 270.3)
- #574400
#574400
oklch(39.6% 0.081 90.6)
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 #33427B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Cobalt #1E488F ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.044
- Light Navy #155084 ΔE 0.045
- Dusk Blue #26538D ΔE 0.053
- Blueberry #464196 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.061
Use #33427B 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.