#0A3753
Closest named color: Prussian Blue (#1D3557). oklch(32.3% 0.068 241.7), rgb(10, 55, 83).
Aa
White text reads best on this color (12.46:1).
About this color
#0A3753 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.068 and its hue 242°. 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 12.46:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.68:1 |
| White text | 12.46:1 |
Values
| HEX | #0A3753 |
| RGB | rgb(10, 55, 83) |
| HSL | hsl(203, 78%, 18%) |
| OKLCH | oklch(32.3% 0.068 241.7) |
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 #0A3753 | 12.46:1 | AAA | Lc -101.5 | Preferred for body text |
| Black text on #0A3753 | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #0A3753 text on white | 12.46:1 | AAA | Lc 98.0 | Preferred for body text |
| #0A3753 text on black | 1.68:1 | 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 950.
-
Step 50
50
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DDECF8
oklch(93.5% 0.023 241.9)
-
Step 200
200
#C0DEF5
oklch(88.6% 0.045 241.1)
-
Step 300
300
#92C8F1
oklch(81% 0.081 241.7)
-
Step 400
400
#4BA9EA
oklch(70.6% 0.13 242.1)
-
Step 500
500
#0092DA
oklch(63.1% 0.148 241.4)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950 (this color)
#0A3753
oklch(32.3% 0.068 241.7)
#0A3753 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) | #2A3854 | 0.033 |
| Deuteranopia (no green cones) | #203152 | 0.025 |
| Tritanopia (no blue cones) | #003E41 | 0.046 |
| Achromatopsia (no color) | #343434 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3753
#0A3753
oklch(32.3% 0.068 241.7)
- #4C2A07
#4C2A07
oklch(32.2% 0.068 61)
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 #0A3753, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Midnight Green #073B4C ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.027
- Marine Blue #01386A ΔE 0.040
- Marine #042E60 ΔE 0.041
- Gunmetal #293241 ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.048
- Onyx #343A40 ΔE 0.059
Use #0A3753 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.