#103F5D
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.2% 0.072 241.6), rgb(16, 63, 93).
Aa
White text reads best on this color (11.10:1).
About this color
#103F5D is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.072 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.029 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #103F5D |
| RGB | rgb(16, 63, 93) |
| HSL | hsl(203, 71%, 21%) |
| OKLCH | oklch(35.2% 0.072 241.6) |
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 #103F5D | 11.10:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #103F5D | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #103F5D text on white | 11.10:1 | AAA | Lc 95.4 | Preferred for body text |
| #103F5D text on black | 1.89:1 | 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
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C6E1
oklch(81% 0.054 241.5)
-
Step 400
400
#6FA8D2
oklch(70.8% 0.086 241.4)
-
Step 500
500
#4491C6
oklch(63.1% 0.11 241.6)
-
Step 600
600
#1E7AB2
oklch(55.5% 0.119 241.5)
-
Step 700
700
#0D679A
oklch(49.2% 0.111 241.6)
-
Step 800
800
#11547C
oklch(42.7% 0.091 241.2)
-
Step 900
900 (this color)
#103F5D
oklch(35.2% 0.072 241.6)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#103F5D 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) | #31405E | 0.035 |
| Deuteranopia (no green cones) | #26385C | 0.028 |
| Tritanopia (no blue cones) | #00464A | 0.047 |
| Achromatopsia (no color) | #3C3C3C | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103F5D
#103F5D
oklch(35.2% 0.072 241.6)
- #55310C
#55310C
oklch(35.1% 0.072 61.6)
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 #103F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.032
- Midnight Green #073B4C ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.036
- Marine Blue #01386A ΔE 0.036
- Charcoal #264653 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.050
- Marine #042E60 ΔE 0.057
Use #103F5D 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.