#273A6B
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.088 266.1), rgb(39, 58, 107).
Aa
White text reads best on this color (11.03:1).
About this color
#273A6B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.088 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.033 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #273A6B |
| RGB | rgb(39, 58, 107) |
| HSL | hsl(223, 47%, 29%) |
| OKLCH | oklch(35.9% 0.088 266.1) |
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 #273A6B | 11.03:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #273A6B | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #273A6B text on white | 11.03:1 | AAA | Lc 95.3 | Preferred for body text |
| #273A6B text on black | 1.90:1 | Fails | Lc -7.3 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ADC0EC
oklch(80.8% 0.066 266.6)
-
Step 400
400
#829FE3
oklch(70.8% 0.105 266.1)
-
Step 500
500
#6385DB
oklch(63% 0.135 266.3)
-
Step 600
600
#4A6DC9
oklch(55.6% 0.148 266.1)
-
Step 700
700
#3C5BAE
oklch(49.2% 0.137 266.1)
-
Step 800
800
#324B8D
oklch(42.9% 0.113 266.1)
-
Step 900
900 (this color)
#273A6B
oklch(35.9% 0.088 266.1)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#273A6B 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) | #243F6D | 0.015 |
| Deuteranopia (no green cones) | #1A396A | 0.016 |
| Tritanopia (no blue cones) | #00454D | 0.077 |
| Achromatopsia (no color) | #3C3C3C | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273A6B
#273A6B
oklch(35.9% 0.088 266.1)
- #4E3900
#4E3900
oklch(35.8% 0.073 85.4)
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 #273A6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.033
- Twilight Blue #0A437A ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.056
- Marine #042E60 ΔE 0.056
- Charcoal #264653 ΔE 0.064
- Midnight Green #073B4C ΔE 0.065
Use #273A6B 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.