#103D4F
Closest named color: Midnight Green (#073B4C). oklch(33.9% 0.057 228.9), rgb(16, 61, 79).
Aa
White text reads best on this color (11.65:1).
About this color
#103D4F is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.057 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.010 away. White text reads best on it, at 11.65:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.80:1 |
| White text | 11.65:1 |
Values
| HEX | #103D4F |
| RGB | rgb(16, 61, 79) |
| HSL | hsl(197, 66%, 19%) |
| OKLCH | oklch(33.9% 0.057 228.9) |
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 #103D4F | 11.65:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #103D4F | 1.80:1 | Fails | Lc 7.3 | Not readable |
| #103D4F text on white | 11.65:1 | AAA | Lc 96.5 | Preferred for body text |
| #103D4F text on black | 1.80:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A5C7D7
oklch(81% 0.043 228)
-
Step 400
400
#73A9C3
oklch(70.7% 0.068 229.7)
-
Step 500
500
#4A94B4
oklch(63.2% 0.088 228.7)
-
Step 600
600
#287D9F
oklch(55.5% 0.094 229.1)
-
Step 700
700
#186A88
oklch(49.2% 0.088 228.2)
-
Step 800
800
#18566F
oklch(42.6% 0.073 229.5)
-
Step 900
900 (this color)
#103D4F
oklch(33.9% 0.057 228.9)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#103D4F 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) | #343C50 | 0.041 |
| Deuteranopia (no green cones) | #2B364F | 0.034 |
| Tritanopia (no blue cones) | #004243 | 0.033 |
| Achromatopsia (no color) | #383838 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103D4F
#103D4F
oklch(33.9% 0.057 228.9)
- #4F2E1C
#4F2E1C
oklch(33.8% 0.057 48.7)
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 #103D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.010
- Dark Blue Grey #1F3B4D ΔE 0.013
- Prussian Blue #1D3557 ΔE 0.034
- Charcoal #264653 ΔE 0.039
- Gunmetal #293241 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.044
- Onyx #343A40 ΔE 0.045
- Marine Blue #01386A ΔE 0.054
Use #103D4F 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.