#103A5B
Closest named color: Prussian Blue (#1D3557). oklch(33.8% 0.074 246.4), rgb(16, 58, 91).
Aa
White text reads best on this color (11.80:1).
About this color
#103A5B is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.074 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.018 away. White text reads best on it, at 11.80:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.80:1 |
Values
| HEX | #103A5B |
| RGB | rgb(16, 58, 91) |
| HSL | hsl(206, 70%, 21%) |
| OKLCH | oklch(33.8% 0.074 246.4) |
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 #103A5B | 11.80:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #103A5B | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #103A5B text on white | 11.80:1 | AAA | Lc 96.8 | Preferred for body text |
| #103A5B text on black | 1.77:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A4C5E3
oklch(80.9% 0.055 246)
-
Step 400
400
#72A6D5
oklch(70.7% 0.089 246.7)
-
Step 500
500
#4A8FCA
oklch(63.1% 0.113 246.6)
-
Step 600
600
#2878B7
oklch(55.6% 0.124 246.7)
-
Step 700
700
#1A659D
oklch(49.1% 0.114 246.3)
-
Step 800
800
#19537F
oklch(42.8% 0.094 245.8)
-
Step 900
900 (this color)
#103A5B
oklch(33.8% 0.074 246.4)
-
Step 950
950
#11283C
oklch(26.9% 0.047 246.9)
#103A5B 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) | #2B3B5C | 0.029 |
| Deuteranopia (no green cones) | #20345A | 0.022 |
| Tritanopia (no blue cones) | #004246 | 0.053 |
| Achromatopsia (no color) | #383838 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103A5B
#103A5B
oklch(33.8% 0.074 246.4)
- #502E01
#502E01
oklch(33.6% 0.074 66.5)
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 #103A5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.018
- Dark Blue Grey #1F3B4D ΔE 0.028
- Marine Blue #01386A ΔE 0.029
- Midnight Green #073B4C ΔE 0.029
- Marine #042E60 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.049
- Gunmetal #293241 ΔE 0.051
- Charcoal #264653 ΔE 0.052
Use #103A5B 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.