#30377B
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.114 274.9), rgb(48, 55, 123).
Aa
White text reads best on this color (10.72:1).
About this color
#30377B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.114 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #30377B |
| RGB | rgb(48, 55, 123) |
| HSL | hsl(234, 44%, 34%) |
| OKLCH | oklch(37.1% 0.114 274.9) |
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 #30377B | 10.72:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #30377B | 1.95:1 | Fails | Lc 9.3 | Not readable |
| #30377B text on white | 10.72:1 | AAA | Lc 94.6 | Preferred for body text |
| #30377B text on black | 1.95:1 | Fails | Lc -8.0 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD7F9
oklch(88.4% 0.048 274.9)
-
Step 300
300
#B0BDF9
oklch(81% 0.086 274.8)
-
Step 400
400
#8898F5
oklch(70.7% 0.137 275)
-
Step 500
500
#6D7BF1
oklch(63% 0.175 275.1)
-
Step 600
600
#5761E0
oklch(55.6% 0.191 274.9)
-
Step 700
700
#484FC3
oklch(49.1% 0.178 275.1)
-
Step 800
800
#3B429D
oklch(42.8% 0.146 275.1)
-
Step 900
900 (this color)
#30377B
oklch(37.1% 0.114 274.9)
-
Step 950
950
#1D2249
oklch(27% 0.072 275)
#30377B 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) | #0D417D | 0.039 |
| Deuteranopia (no green cones) | #003B7A | 0.042 |
| Tritanopia (no blue cones) | #004753 | 0.101 |
| Achromatopsia (no color) | #3E3E3E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #30377B
#30377B
oklch(37.1% 0.114 274.9)
- #4D3F00
#4D3F00
oklch(37.2% 0.076 94.7)
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 #30377B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.051
- Marine Blue #01386A ΔE 0.054
- Cobalt #1E488F ΔE 0.055
- Blueberry #464196 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.069
- Light Navy #155084 ΔE 0.071
- Marine #042E60 ΔE 0.074
Use #30377B 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.