#33387A
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.111 276.4), rgb(51, 56, 122).
Aa
White text reads best on this color (10.56:1).
About this color
#33387A is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.111 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.045 away. White text reads best on it, at 10.56:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.56:1 |
Values
| HEX | #33387A |
| RGB | rgb(51, 56, 122) |
| HSL | hsl(236, 41%, 34%) |
| OKLCH | oklch(37.4% 0.111 276.4) |
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 #33387A | 10.56:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #33387A | 1.98:1 | Fails | Lc 9.6 | Not readable |
| #33387A text on white | 10.56:1 | AAA | Lc 94.3 | Preferred for body text |
| #33387A text on black | 1.98:1 | Fails | Lc -8.3 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D7F8
oklch(88.4% 0.046 276)
-
Step 300
300
#B2BCF7
oklch(80.8% 0.084 276.9)
-
Step 400
400
#8B98F2
oklch(70.7% 0.132 276.2)
-
Step 500
500
#717BEE
oklch(63.1% 0.17 276.6)
-
Step 600
600
#5B61DC
oklch(55.6% 0.184 276.5)
-
Step 700
700
#4B50BF
oklch(49.2% 0.171 276.2)
-
Step 800
800
#3D429B
oklch(42.7% 0.143 276.1)
-
Step 900
900 (this color)
#33387A
oklch(37.4% 0.111 276.4)
-
Step 950
950
#1E2248
oklch(27% 0.07 276.2)
#33387A 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) | #14427C | 0.039 |
| Deuteranopia (no green cones) | #063C79 | 0.043 |
| Tritanopia (no blue cones) | #0C4753 | 0.097 |
| Achromatopsia (no color) | #3F3F3F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33387A
#33387A
oklch(37.4% 0.111 276.4)
- #4D4000
#4D4000
oklch(37.4% 0.077 96)
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 #33387A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.047
- Cobalt #1E488F ΔE 0.054
- Marine Blue #01386A ΔE 0.057
- Blueberry #464196 ΔE 0.061
- Light Navy #155084 ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.076
Use #33387A 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.