#04375A
Closest named color: Prussian Blue (#1D3557). oklch(32.6% 0.079 245.5), rgb(4, 55, 90).
Aa
White text reads best on this color (12.35:1).
About this color
#04375A is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.079 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 12.35:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.69:1 |
| White text | 12.35:1 |
Values
| HEX | #04375A |
| RGB | rgb(4, 55, 90) |
| HSL | hsl(204, 91%, 18%) |
| OKLCH | oklch(32.6% 0.079 245.5) |
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 #04375A | 12.35:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #04375A | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #04375A text on white | 12.35:1 | AAA | Lc 97.7 | Preferred for body text |
| #04375A text on black | 1.69:1 | Fails | Lc 0.0 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A1C5E5
oklch(80.8% 0.06 245.5)
-
Step 400
400
#6CA7D9
oklch(70.8% 0.096 245.3)
-
Step 500
500
#4190CE
oklch(63.2% 0.121 245.2)
-
Step 600
600
#1879BB
oklch(55.7% 0.132 245.2)
-
Step 700
700
#0565A1
oklch(49% 0.123 245.5)
-
Step 800
800
#0D5383
oklch(42.8% 0.102 245.5)
-
Step 900
900 (this color)
#04375A
oklch(32.6% 0.079 245.5)
-
Step 950
950
#0F293D
oklch(27.1% 0.049 244.3)
#04375A 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) | #26395B | 0.032 |
| Deuteranopia (no green cones) | #193159 | 0.022 |
| Tritanopia (no blue cones) | #004044 | 0.056 |
| Achromatopsia (no color) | #343434 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04375A
#04375A
oklch(32.6% 0.079 245.5)
- #4D2B00
#4D2B00
oklch(32.5% 0.073 65.3)
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 #04375A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Marine Blue #01386A ΔE 0.028
- Midnight Green #073B4C ΔE 0.031
- Marine #042E60 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.036
- Gunmetal #293241 ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.063
Use #04375A 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.