#0D3E8C
Closest named color: Cobalt (#1E488F). oklch(38.4% 0.14 260), rgb(13, 62, 140).
Aa
White text reads best on this color (10.07:1).
About this color
#0D3E8C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.140 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 10.07:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.08:1 |
| White text | 10.07:1 |
Values
| HEX | #0D3E8C |
| RGB | rgb(13, 62, 140) |
| HSL | hsl(217, 83%, 30%) |
| OKLCH | oklch(38.4% 0.14 260) |
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 #0D3E8C | 10.07:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #0D3E8C | 2.08:1 | Fails | Lc 11.2 | Not readable |
| #0D3E8C text on white | 10.07:1 | AAA | Lc 92.8 | Preferred for body text |
| #0D3E8C text on black | 2.08:1 | Fails | Lc -9.7 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3883FF
oklch(63% 0.199 260)
-
Step 600
600
#0067F4
oklch(55.6% 0.226 260)
-
Step 700
700
#0056CF
oklch(49.1% 0.2 260)
-
Step 800
800
#0046AC
oklch(42.7% 0.175 260)
-
Step 900
900 (this color)
#0D3E8C
oklch(38.4% 0.14 260)
-
Step 950
950
#092451
oklch(27.1% 0.089 260.2)
#0D3E8C 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) | #00488F | 0.027 |
| Deuteranopia (no green cones) | #003D8A | 0.008 |
| Tritanopia (no blue cones) | #00515E | 0.106 |
| Achromatopsia (no color) | #424242 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0D3E8C
#0D3E8C
oklch(38.4% 0.14 260)
- #593E00
#593E00
oklch(38.4% 0.079 80.8)
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 #0D3E8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Twilight Blue #0A437A ΔE 0.035
- Sapphire #2138AB ΔE 0.055
- Light Navy #155084 ΔE 0.056
- Marine Blue #01386A ΔE 0.061
- Dusk Blue #26538D ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.068
- Blueberry #464196 ΔE 0.068
Use #0D3E8C 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.