#103583
Closest named color: Twilight Blue (#0A437A). oklch(35.7% 0.138 262.6), rgb(16, 53, 131).
Aa
White text reads best on this color (11.29:1).
About this color
#103583 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.138 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 11.29:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.85:1 |
| White text | 11.29:1 |
Values
| HEX | #103583 |
| RGB | rgb(16, 53, 131) |
| HSL | hsl(221, 78%, 29%) |
| OKLCH | oklch(35.7% 0.138 262.6) |
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 #103583 | 11.29:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #103583 | 1.85:1 | Fails | Lc 8.4 | Not readable |
| #103583 text on white | 11.29:1 | AAA | Lc 95.5 | Preferred for body text |
| #103583 text on black | 1.85:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4481FF
oklch(63% 0.198 262.7)
-
Step 600
600
#1E64F7
oklch(55.7% 0.23 262.5)
-
Step 700
700
#1251D7
oklch(49% 0.214 262.6)
-
Step 800
800
#1244AE
oklch(42.8% 0.177 262.6)
-
Step 900
900 (this color)
#103583
oklch(35.7% 0.138 262.6)
-
Step 950
950
#0D2350
oklch(26.9% 0.087 262.5)
#103583 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) | #004086 | 0.029 |
| Deuteranopia (no green cones) | #003581 | 0.010 |
| Tritanopia (no blue cones) | #004956 | 0.107 |
| Achromatopsia (no color) | #3A3A3A | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103583
#103583
oklch(35.7% 0.138 262.6)
- #4F3800
#4F3800
oklch(35.7% 0.073 82.8)
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 #103583, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Marine Blue #01386A ΔE 0.046
- Cobalt #1E488F ΔE 0.058
- Marine #042E60 ΔE 0.065
- Royal #0C1793 ΔE 0.065
- Sapphire #2138AB ΔE 0.070
- Midnight Blue #191970 ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.077
Use #103583 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.