#0A3C5A
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.073 241.2), rgb(10, 60, 90).
Aa
White text reads best on this color (11.62:1).
About this color
#0A3C5A is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.073 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.024 away. White text reads best on it, at 11.62:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.80:1 |
| White text | 11.62:1 |
Values
| HEX | #0A3C5A |
| RGB | rgb(10, 60, 90) |
| HSL | hsl(203, 80%, 20%) |
| OKLCH | oklch(34.1% 0.073 241.2) |
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 #0A3C5A | 11.62:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #0A3C5A | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #0A3C5A text on white | 11.62:1 | AAA | Lc 96.4 | Preferred for body text |
| #0A3C5A text on black | 1.80:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A2C6E1
oklch(80.9% 0.054 240.8)
-
Step 400
400
#6DA8D2
oklch(70.7% 0.087 240.6)
-
Step 500
500
#4291C6
oklch(63% 0.111 241.1)
-
Step 600
600
#1A7AB3
oklch(55.5% 0.121 241.5)
-
Step 700
700
#06679A
oklch(49.1% 0.112 241)
-
Step 800
800
#0E547D
oklch(42.7% 0.093 241.3)
-
Step 900
900 (this color)
#0A3C5A
oklch(34.1% 0.073 241.2)
-
Step 950
950
#0F293B
oklch(27% 0.046 241.6)
#0A3C5A 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) | #2E3D5B | 0.036 |
| Deuteranopia (no green cones) | #233559 | 0.028 |
| Tritanopia (no blue cones) | #004347 | 0.047 |
| Achromatopsia (no color) | #393939 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3C5A
#0A3C5A
oklch(34.1% 0.073 241.2)
- #532E08
#532E08
oklch(34.2% 0.073 60.6)
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 #0A3C5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.024
- Midnight Green #073B4C ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.026
- Marine Blue #01386A ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal #264653 ΔE 0.047
- Marine #042E60 ΔE 0.049
- Gunmetal #293241 ΔE 0.052
Use #0A3C5A 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.