#273D6C
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.086 263.8), rgb(39, 61, 108).
Aa
White text reads best on this color (10.65:1).
About this color
#273D6C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.086 and its hue 264°. 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 10.65:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #273D6C |
| RGB | rgb(39, 61, 108) |
| HSL | hsl(221, 47%, 29%) |
| OKLCH | oklch(36.7% 0.086 263.8) |
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 #273D6C | 10.65:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #273D6C | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #273D6C text on white | 10.65:1 | AAA | Lc 94.5 | Preferred for body text |
| #273D6C 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
#F2F5FB
oklch(97% 0.009 264.5)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1EB
oklch(80.9% 0.064 263.3)
-
Step 400
400
#7FA0E1
oklch(70.7% 0.103 263.3)
-
Step 500
500
#6087D9
oklch(63.2% 0.131 263.8)
-
Step 600
600
#476FC6
oklch(55.6% 0.142 263.8)
-
Step 700
700
#385CAB
oklch(49% 0.133 263.8)
-
Step 800
800
#2F4C8B
oklch(42.8% 0.11 263.8)
-
Step 900
900 (this color)
#273D6C
oklch(36.7% 0.086 263.8)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#273D6C 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) | #28426E | 0.015 |
| Deuteranopia (no green cones) | #1F3B6B | 0.012 |
| Tritanopia (no blue cones) | #00484F | 0.075 |
| Achromatopsia (no color) | #3E3E3E | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273D6C
#273D6C
oklch(36.7% 0.086 263.8)
- #523B00
#523B00
oklch(36.8% 0.076 83.9)
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 #273D6C, 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 0.037
- Prussian Blue #1D3557 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.056
- Charcoal #264653 ΔE 0.058
- Cobalt #1E488F ΔE 0.063
- Light Navy #155084 ΔE 0.063
Use #273D6C 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.