#103F71
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.099 253.5), rgb(16, 63, 113).
Aa
White text reads best on this color (10.65:1).
About this color
#103F71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.099 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 10.65:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #103F71 |
| RGB | rgb(16, 63, 113) |
| HSL | hsl(211, 75%, 25%) |
| OKLCH | oklch(36.6% 0.099 253.5) |
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 #103F71 | 10.65:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #103F71 | 1.97:1 | Fails | Lc 9.6 | Not readable |
| #103F71 text on white | 10.65:1 | AAA | Lc 94.3 | Preferred for body text |
| #103F71 text on black | 1.97:1 | Fails | Lc -8.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#9FC4F0
oklch(80.9% 0.074 253.1)
-
Step 400
400
#69A4E9
oklch(70.7% 0.119 253.2)
-
Step 500
500
#3D8BE2
oklch(63% 0.152 253.4)
-
Step 600
600
#1373D0
oklch(55.6% 0.165 253.4)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#094F92
oklch(42.7% 0.127 253.3)
-
Step 900
900 (this color)
#103F71
oklch(36.6% 0.099 253.5)
-
Step 950
950
#0D2744
oklch(27% 0.063 253.3)
#103F71 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) | #264373 | 0.025 |
| Deuteranopia (no green cones) | #143A70 | 0.015 |
| Tritanopia (no blue cones) | #004B52 | 0.075 |
| Achromatopsia (no color) | #3E3E3E | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103F71
#103F71
oklch(36.6% 0.099 253.5)
- #573700
#573700
oklch(36.6% 0.078 73.2)
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 #103F71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Marine Blue #01386A ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.053
- Cobalt #1E488F ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Marine #042E60 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #103F71 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.