#30377F
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.12 274.8), rgb(48, 55, 127).
Aa
White text reads best on this color (10.61:1).
About this color
#30377F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #30377F |
| RGB | rgb(48, 55, 127) |
| HSL | hsl(235, 45%, 34%) |
| OKLCH | oklch(37.4% 0.12 274.8) |
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 #30377F | 10.61:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #30377F | 1.97:1 | Fails | Lc 9.6 | Not readable |
| #30377F text on white | 10.61:1 | AAA | Lc 94.3 | Preferred for body text |
| #30377F text on black | 1.97:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#AFBDFB
oklch(81% 0.089 274.4)
-
Step 400
400
#8797FA
oklch(70.7% 0.145 275.1)
-
Step 500
500
#6B7AF7
oklch(63.1% 0.185 274.7)
-
Step 600
600
#565FE6
oklch(55.6% 0.201 274.9)
-
Step 700
700
#474DC8
oklch(49.1% 0.188 275)
-
Step 800
800
#3A40A1
oklch(42.6% 0.154 275)
-
Step 900
900 (this color)
#30377F
oklch(37.4% 0.12 274.8)
-
Step 950
950
#1C214B
oklch(26.9% 0.077 274.9)
#30377F 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) | #044281 | 0.043 |
| Deuteranopia (no green cones) | #003B7E | 0.041 |
| Tritanopia (no blue cones) | #004855 | 0.104 |
| Achromatopsia (no color) | #3E3E3E | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #30377F
#30377F
oklch(37.4% 0.12 274.8)
- #4E4000
#4E4000
oklch(37.5% 0.077 94.9)
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 #30377F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.047
- Cobalt #1E488F ΔE 0.051
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.059
- Light Navy #155084 ΔE 0.071
- Sapphire #2138AB ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.075
Use #30377F 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.