#30387B
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.113 274.4), rgb(48, 56, 123).
Aa
White text reads best on this color (10.62:1).
About this color
#30387B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.113 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #30387B |
| RGB | rgb(48, 56, 123) |
| HSL | hsl(234, 44%, 34%) |
| OKLCH | oklch(37.3% 0.113 274.4) |
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 #30387B | 10.62:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #30387B | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #30387B text on white | 10.62:1 | AAA | Lc 94.4 | Preferred for body text |
| #30387B text on black | 1.97:1 | Fails | Lc -8.2 | 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
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#B0BDF8
oklch(80.9% 0.085 274.7)
-
Step 400
400
#8799F4
oklch(70.7% 0.135 274)
-
Step 500
500
#6C7CF0
oklch(63.1% 0.173 274.4)
-
Step 600
600
#5662DF
oklch(55.6% 0.188 274.4)
-
Step 700
700
#4750C1
oklch(49.1% 0.174 274.5)
-
Step 800
800
#3A429C
oklch(42.6% 0.145 274.6)
-
Step 900
900 (this color)
#30387B
oklch(37.3% 0.113 274.4)
-
Step 950
950
#1C2249
oklch(27% 0.072 274)
#30387B 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) | #11427D | 0.038 |
| Deuteranopia (no green cones) | #003B7A | 0.041 |
| Tritanopia (no blue cones) | #004754 | 0.098 |
| Achromatopsia (no color) | #3E3E3E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #30387B
#30387B
oklch(37.3% 0.113 274.4)
- #4E3F00
#4E3F00
oklch(37.3% 0.076 93.6)
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 #30387B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.049
- Cobalt #1E488F ΔE 0.053
- Marine Blue #01386A ΔE 0.054
- Blueberry #464196 ΔE 0.062
- Light Navy #155084 ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.069
- Marine #042E60 ΔE 0.075
Use #30387B 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.