#273C79
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.107 266.9), rgb(39, 60, 121).
Aa
White text reads best on this color (10.45:1).
About this color
#273C79 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.107 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #273C79 |
| RGB | rgb(39, 60, 121) |
| HSL | hsl(225, 51%, 31%) |
| OKLCH | oklch(37.4% 0.107 266.9) |
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 #273C79 | 10.45:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #273C79 | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #273C79 text on white | 10.45:1 | AAA | Lc 94.0 | Preferred for body text |
| #273C79 text on black | 2.00:1 | Fails | Lc -8.5 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F8
oklch(88.5% 0.045 267.4)
-
Step 300
300
#A9C0F6
oklch(81% 0.081 266.7)
-
Step 400
400
#7C9DF1
oklch(70.7% 0.129 266.8)
-
Step 500
500
#5C82EC
oklch(63.1% 0.165 266.8)
-
Step 600
600
#4469DA
oklch(55.6% 0.178 266.8)
-
Step 700
700
#3657BD
oklch(49.2% 0.165 266.7)
-
Step 800
800
#2D4799
oklch(42.6% 0.138 267.1)
-
Step 900
900 (this color)
#273C79
oklch(37.4% 0.107 266.9)
-
Step 950
950
#172447
oklch(26.9% 0.068 266.6)
#273C79 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) | #1C437B | 0.021 |
| Deuteranopia (no green cones) | #093C78 | 0.025 |
| Tritanopia (no blue cones) | #004A54 | 0.090 |
| Achromatopsia (no color) | #3F3F3F | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273C79
#273C79
oklch(37.4% 0.107 266.9)
- #523D00
#523D00
oklch(37.3% 0.076 86.6)
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 #273C79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.044
- Cobalt #1E488F ΔE 0.046
- Light Navy #155084 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.066
- Blueberry #464196 ΔE 0.068
Use #273C79 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.