#273C71
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.095 265.7), rgb(39, 60, 113).
Aa
White text reads best on this color (10.65:1).
About this color
#273C71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.095 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.65:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #273C71 |
| RGB | rgb(39, 60, 113) |
| HSL | hsl(223, 49%, 30%) |
| OKLCH | oklch(36.8% 0.095 265.7) |
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 #273C71 | 10.65:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #273C71 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #273C71 text on white | 10.65:1 | AAA | Lc 94.5 | Preferred for body text |
| #273C71 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ABC0F0
oklch(80.9% 0.072 266.3)
-
Step 400
400
#7F9FE8
oklch(70.8% 0.113 265.5)
-
Step 500
500
#5F85E1
oklch(63.2% 0.145 265.5)
-
Step 600
600
#466CCF
oklch(55.5% 0.159 265.7)
-
Step 700
700
#385AB3
oklch(49.1% 0.147 265.6)
-
Step 800
800
#2F4A91
oklch(42.8% 0.122 265.8)
-
Step 900
900 (this color)
#273C71
oklch(36.8% 0.095 265.7)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#273C71 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) | #234273 | 0.017 |
| Deuteranopia (no green cones) | #173B70 | 0.018 |
| Tritanopia (no blue cones) | #004851 | 0.080 |
| Achromatopsia (no color) | #3E3E3E | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273C71
#273C71
oklch(36.8% 0.095 265.7)
- #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 #273C71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.055
- Cobalt #1E488F ΔE 0.057
- Light Navy #155084 ΔE 0.062
- Marine #042E60 ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.065
Use #273C71 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.