#273C6D
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.089 264.9), rgb(39, 60, 109).
Aa
White text reads best on this color (10.75:1).
About this color
#273C6D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.089 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 10.75:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #273C6D |
| RGB | rgb(39, 60, 109) |
| HSL | hsl(222, 47%, 29%) |
| OKLCH | oklch(36.6% 0.089 264.9) |
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 #273C6D | 10.75:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #273C6D | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #273C6D text on white | 10.75:1 | AAA | Lc 94.7 | Preferred for body text |
| #273C6D text on black | 1.95:1 | Fails | Lc -7.9 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDD9F2
oklch(88.4% 0.037 265.1)
-
Step 300
300
#ACC1ED
oklch(81% 0.067 264.9)
-
Step 400
400
#809FE3
oklch(70.6% 0.106 265)
-
Step 500
500
#6086DB
oklch(63.1% 0.135 264.6)
-
Step 600
600
#486EC9
oklch(55.7% 0.147 265)
-
Step 700
700
#395BAE
oklch(49% 0.138 265)
-
Step 800
800
#2F4B8D
oklch(42.7% 0.114 264.7)
-
Step 900
900 (this color)
#273C6D
oklch(36.6% 0.089 264.9)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#273C6D 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) | #26416F | 0.015 |
| Deuteranopia (no green cones) | #1C3B6C | 0.013 |
| Tritanopia (no blue cones) | #00474F | 0.076 |
| Achromatopsia (no color) | #3E3E3E | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273C6D
#273C6D
oklch(36.6% 0.089 264.9)
- #513B00
#513B00
oklch(36.7% 0.075 84.9)
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 #273C6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Marine Blue #01386A ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.058
- Marine #042E60 ΔE 0.061
- Charcoal #264653 ΔE 0.062
- Cobalt #1E488F ΔE 0.062
Use #273C6D 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.