#273C73
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.098 266), rgb(39, 60, 115).
Aa
White text reads best on this color (10.60:1).
About this color
#273C73 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.098 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.028 away. White text reads best on it, at 10.60:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.60:1 |
Values
| HEX | #273C73 |
| RGB | rgb(39, 60, 115) |
| HSL | hsl(223, 49%, 30%) |
| OKLCH | oklch(37% 0.098 266) |
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 #273C73 | 10.60:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #273C73 | 1.98:1 | Fails | Lc 9.5 | Not readable |
| #273C73 text on white | 10.60:1 | AAA | Lc 94.4 | Preferred for body text |
| #273C73 text on black | 1.98:1 | Fails | Lc -8.2 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC0F1
oklch(80.8% 0.074 265.9)
-
Step 400
400
#7E9EEA
oklch(70.7% 0.118 266.1)
-
Step 500
500
#5E84E4
oklch(63.1% 0.151 266)
-
Step 600
600
#466BD2
oklch(55.5% 0.164 266.3)
-
Step 700
700
#3859B6
oklch(49.1% 0.152 266.2)
-
Step 800
800
#2E4993
oklch(42.6% 0.126 266.1)
-
Step 900
900 (this color)
#273C73
oklch(37% 0.098 266)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#273C73 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) | #214275 | 0.018 |
| Deuteranopia (no green cones) | #153B72 | 0.019 |
| Tritanopia (no blue cones) | #004952 | 0.083 |
| Achromatopsia (no color) | #3F3F3F | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273C73
#273C73
oklch(37% 0.098 266)
- #513C00
#513C00
oklch(36.9% 0.076 86.3)
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 #273C73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.028
- Marine Blue #01386A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.053
- Cobalt #1E488F ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.058
- Light Navy #155084 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.065
- Marine #042E60 ΔE 0.065
Use #273C73 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.