#273D71
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.094 264.9), rgb(39, 61, 113).
Aa
White text reads best on this color (10.54:1).
About this color
#273D71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.094 and its hue 265°. 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 10.54:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.54:1 |
Values
| HEX | #273D71 |
| RGB | rgb(39, 61, 113) |
| HSL | hsl(222, 49%, 30%) |
| OKLCH | oklch(37.1% 0.094 264.9) |
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 #273D71 | 10.54:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #273D71 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #273D71 text on white | 10.54:1 | AAA | Lc 94.2 | Preferred for body text |
| #273D71 text on black | 1.99:1 | Fails | Lc -8.3 | 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
#ABC1EF
oklch(81% 0.07 264.9)
-
Step 400
400
#7E9FE7
oklch(70.7% 0.112 264.9)
-
Step 500
500
#5E85E0
oklch(63.1% 0.144 265.1)
-
Step 600
600
#456DCE
oklch(55.6% 0.157 264.9)
-
Step 700
700
#375AB2
oklch(49% 0.146 265.1)
-
Step 800
800
#2E4A90
oklch(42.6% 0.12 265.3)
-
Step 900
900 (this color)
#273D71
oklch(37.1% 0.094 264.9)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#273D71 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) | #254373 | 0.018 |
| Deuteranopia (no green cones) | #193C70 | 0.016 |
| Tritanopia (no blue cones) | #004951 | 0.080 |
| Achromatopsia (no color) | #3F3F3F | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273D71
#273D71
oklch(37.1% 0.094 264.9)
- #523C00
#523C00
oklch(37.1% 0.076 85.3)
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 #273D71, 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 0.051
- Dark Grey Blue #29465B ΔE 0.053
- Cobalt #1E488F ΔE 0.055
- Light Navy #155084 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.064
- Charcoal #264653 ΔE 0.066
Use #273D71 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.