#103E66
Closest named color: Marine Blue (#01386A). oklch(35.6% 0.085 249.1), rgb(16, 62, 102).
Aa
White text reads best on this color (11.03:1).
About this color
#103E66 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.085 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.024 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #103E66 |
| RGB | rgb(16, 62, 102) |
| HSL | hsl(208, 73%, 23%) |
| OKLCH | oklch(35.6% 0.085 249.1) |
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 #103E66 | 11.03:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #103E66 | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #103E66 text on white | 11.03:1 | AAA | Lc 95.2 | Preferred for body text |
| #103E66 text on black | 1.90:1 | Fails | Lc -7.5 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A1C5E9
oklch(81% 0.064 248.6)
-
Step 400
400
#6DA6DE
oklch(70.8% 0.102 249)
-
Step 500
500
#428ED4
oklch(63.1% 0.13 249)
-
Step 600
600
#1C77C2
oklch(55.7% 0.142 249.1)
-
Step 700
700
#0A63A7
oklch(49% 0.132 249.3)
-
Step 800
800
#105187
oklch(42.6% 0.109 249.3)
-
Step 900
900 (this color)
#103E66
oklch(35.6% 0.085 249.1)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#103E66 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) | #2B4068 | 0.028 |
| Deuteranopia (no green cones) | #1E3865 | 0.020 |
| Tritanopia (no blue cones) | #00484D | 0.062 |
| Achromatopsia (no color) | #3C3C3C | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103E66
#103E66
oklch(35.6% 0.085 249.1)
- #563300
#563300
oklch(35.6% 0.078 68.5)
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 #103E66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.024
- Prussian Blue #1D3557 ΔE 0.034
- Twilight Blue #0A437A ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.044
- Midnight Green #073B4C ΔE 0.047
- Charcoal #264653 ΔE 0.052
- Marine #042E60 ΔE 0.052
Use #103E66 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.