#303D72
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.092 271.1), rgb(48, 61, 114).
Aa
White text reads best on this color (10.31:1).
About this color
#303D72 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.092 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.036 away. White text reads best on it, at 10.31:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.03:1 |
| White text | 10.31:1 |
Values
| HEX | #303D72 |
| RGB | rgb(48, 61, 114) |
| HSL | hsl(228, 41%, 32%) |
| OKLCH | oklch(37.7% 0.092 271.1) |
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 #303D72 | 10.31:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #303D72 | 2.03:1 | Fails | Lc 10.1 | Not readable |
| #303D72 text on white | 10.31:1 | AAA | Lc 93.8 | Preferred for body text |
| #303D72 text on black | 2.03:1 | Fails | Lc -8.7 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#CFD8F3
oklch(88.4% 0.038 271)
-
Step 300
300
#B0BFEE
oklch(80.9% 0.069 271)
-
Step 400
400
#879CE6
oklch(70.6% 0.111 271.2)
-
Step 500
500
#6B82DE
oklch(63.1% 0.141 271.3)
-
Step 600
600
#536ACC
oklch(55.6% 0.153 270.8)
-
Step 700
700
#4458B0
oklch(49.2% 0.141 270.8)
-
Step 800
800
#38488F
oklch(42.7% 0.118 271.1)
-
Step 900
900 (this color)
#303D72
oklch(37.7% 0.092 271.1)
-
Step 950
950
#1C2443
oklch(27% 0.059 271.1)
#303D72 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) | #264374 | 0.020 |
| Deuteranopia (no green cones) | #1E3E71 | 0.021 |
| Tritanopia (no blue cones) | #0B4952 | 0.082 |
| Achromatopsia (no color) | #404040 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D72
#303D72
oklch(37.7% 0.092 271.1)
- #513F00
#513F00
oklch(37.6% 0.077 90.4)
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 #303D72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Marine Blue #01386A ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.055
- Cobalt #1E488F ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Charcoal #264653 ΔE 0.068
Use #303D72 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.