#103D5B
Closest named color: Prussian Blue (#1D3557). oklch(34.6% 0.071 242.5), rgb(16, 61, 91).
Aa
White text reads best on this color (11.40:1).
About this color
#103D5B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.071 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.40:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #103D5B |
| RGB | rgb(16, 61, 91) |
| HSL | hsl(204, 70%, 21%) |
| OKLCH | oklch(34.6% 0.071 242.5) |
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 #103D5B | 11.40:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #103D5B | 1.84:1 | Fails | Lc 7.9 | Not readable |
| #103D5B text on white | 11.40:1 | AAA | Lc 96.0 | Preferred for body text |
| #103D5B text on black | 1.84:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C5E1
oklch(80.8% 0.054 243.3)
-
Step 400
400
#70A7D2
oklch(70.7% 0.086 242.9)
-
Step 500
500
#4791C6
oklch(63.2% 0.109 242.4)
-
Step 600
600
#237AB2
oklch(55.6% 0.118 242.3)
-
Step 700
700
#136699
oklch(49% 0.11 242.6)
-
Step 800
800
#15547C
oklch(42.8% 0.09 242)
-
Step 900
900 (this color)
#103D5B
oklch(34.6% 0.071 242.5)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#103D5B 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) | #2F3E5C | 0.033 |
| Deuteranopia (no green cones) | #25375A | 0.025 |
| Tritanopia (no blue cones) | #004448 | 0.047 |
| Achromatopsia (no color) | #3A3A3A | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103D5B
#103D5B
oklch(34.6% 0.071 242.5)
- #53300A
#53300A
oklch(34.6% 0.071 62.7)
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 #103D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.026
- Midnight Green #073B4C ΔE 0.028
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal #264653 ΔE 0.043
- Marine #042E60 ΔE 0.052
- Gunmetal #293241 ΔE 0.053
Use #103D5B 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.