#00375B
Closest named color: Prussian Blue (#1D3557). oklch(32.6% 0.082 245.1), rgb(0, 55, 91).
Aa
White text reads best on this color (12.37:1).
About this color
#00375B is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.082 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.021 away. White text reads best on it, at 12.37:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.69:1 |
| White text | 12.37:1 |
Values
| HEX | #00375B |
| RGB | rgb(0, 55, 91) |
| HSL | hsl(204, 100%, 18%) |
| OKLCH | oklch(32.6% 0.082 245.1) |
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 #00375B | 12.37:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #00375B | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #00375B text on white | 12.37:1 | AAA | Lc 97.7 | Preferred for body text |
| #00375B 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
#E0EBF5
oklch(93.5% 0.018 245.4)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#A0C5E6
oklch(80.8% 0.061 245.6)
-
Step 400
400
#6AA7DA
oklch(70.7% 0.098 245)
-
Step 500
500
#3C90D0
oklch(63.1% 0.126 244.9)
-
Step 600
600
#0B79BD
oklch(55.6% 0.136 244.9)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#055384
oklch(42.7% 0.105 244.9)
-
Step 900
900 (this color)
#00375B
oklch(32.6% 0.082 245.1)
-
Step 950
950
#0D293E
oklch(27.1% 0.052 244.2)
#00375B 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) | #25395C | 0.033 |
| Deuteranopia (no green cones) | #18315A | 0.023 |
| Tritanopia (no blue cones) | #004044 | 0.058 |
| Achromatopsia (no color) | #343434 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00375B
#00375B
oklch(32.6% 0.082 245.1)
- #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 #00375B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.021
- Marine Blue #01386A ΔE 0.027
- Marine #042E60 ΔE 0.031
- Midnight Green #073B4C ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.039
- Gunmetal #293241 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.063
Use #00375B 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.