#0A387B
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.124 259), rgb(10, 56, 123).
Aa
White text reads best on this color (11.26:1).
About this color
#0A387B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.124 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 11.26:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #0A387B |
| RGB | rgb(10, 56, 123) |
| HSL | hsl(216, 85%, 26%) |
| OKLCH | oklch(35.5% 0.124 259) |
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 #0A387B | 11.26:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #0A387B | 1.86:1 | Fails | Lc 8.5 | Not readable |
| #0A387B text on white | 11.26:1 | AAA | Lc 95.4 | Preferred for body text |
| #0A387B text on black | 1.86:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9CC2FD
oklch(80.8% 0.094 259)
-
Step 400
400
#65A0FC
oklch(70.6% 0.149 259)
-
Step 500
500
#3985FA
oklch(63.1% 0.19 259.1)
-
Step 600
600
#0F6BE9
oklch(55.6% 0.207 259)
-
Step 700
700
#0058CA
oklch(49.1% 0.191 259.1)
-
Step 800
800
#0749A4
oklch(42.8% 0.159 259)
-
Step 900
900 (this color)
#0A387B
oklch(35.5% 0.124 259)
-
Step 950
950
#0C254C
oklch(27% 0.079 259.2)
#0A387B 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) | #05407D | 0.023 |
| Deuteranopia (no green cones) | #00367A | 0.009 |
| Tritanopia (no blue cones) | #004953 | 0.096 |
| Achromatopsia (no color) | #3B3B3B | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A387B
#0A387B
oklch(35.5% 0.124 259)
- #503600
#503600
oklch(35.4% 0.074 78.8)
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 #0A387B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Twilight Blue #0A437A ΔE 0.033
- Marine #042E60 ΔE 0.055
- Cobalt #1E488F ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.063
- Light Navy #155084 ΔE 0.072
- Midnight Blue #191970 ΔE 0.077
- Royal #0C1793 ΔE 0.078
Use #0A387B 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.