#10375B
Closest named color: Prussian Blue (#1D3557). oklch(33% 0.077 250), rgb(16, 55, 91).
Aa
White text reads best on this color (12.21:1).
About this color
#10375B is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.077 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.013 away. White text reads best on it, at 12.21:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.21:1 |
Values
| HEX | #10375B |
| RGB | rgb(16, 55, 91) |
| HSL | hsl(209, 70%, 21%) |
| OKLCH | oklch(33% 0.077 250) |
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 #10375B | 12.21:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #10375B | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #10375B text on white | 12.21:1 | AAA | Lc 97.6 | Preferred for body text |
| #10375B text on black | 1.71:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E5
oklch(80.9% 0.058 250.2)
-
Step 400
400
#73A5D8
oklch(70.7% 0.092 249.7)
-
Step 500
500
#4D8ECE
oklch(63.2% 0.118 249.9)
-
Step 600
600
#2D77BB
oklch(55.7% 0.128 249.7)
-
Step 700
700
#1F63A1
oklch(49% 0.12 250.2)
-
Step 800
800
#1C5183
oklch(42.6% 0.1 250.4)
-
Step 900
900 (this color)
#10375B
oklch(33% 0.077 250)
-
Step 950
950
#12283D
oklch(27% 0.048 249)
#10375B 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) | #26395C | 0.025 |
| Deuteranopia (no green cones) | #1B325A | 0.017 |
| Tritanopia (no blue cones) | #004044 | 0.058 |
| Achromatopsia (no color) | #353535 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10375B
#10375B
oklch(33% 0.077 250)
- #4C2E00
#4C2E00
oklch(33% 0.071 70.9)
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 #10375B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.013
- Marine Blue #01386A ΔE 0.027
- Marine #042E60 ΔE 0.033
- Midnight Green #073B4C ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.034
- Gunmetal #293241 ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.059
Use #10375B 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.