#273E63
Closest named color: Dark Grey Blue (#29465B). oklch(36.4% 0.071 259.5), rgb(39, 62, 99).
Aa
White text reads best on this color (10.73:1).
About this color
#273E63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.071 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.033 away. White text reads best on it, at 10.73:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.73:1 |
Values
| HEX | #273E63 |
| RGB | rgb(39, 62, 99) |
| HSL | hsl(217, 43%, 27%) |
| OKLCH | oklch(36.4% 0.071 259.5) |
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 #273E63 | 10.73:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #273E63 | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #273E63 text on white | 10.73:1 | AAA | Lc 94.8 | Preferred for body text |
| #273E63 text on black | 1.95:1 | Fails | Lc -7.8 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ADC2E3
oklch(80.9% 0.052 259.4)
-
Step 400
400
#81A2D6
oklch(70.7% 0.085 259.3)
-
Step 500
500
#618ACB
oklch(63.1% 0.109 259.3)
-
Step 600
600
#4873B8
oklch(55.7% 0.118 259.5)
-
Step 700
700
#39609E
oklch(49.1% 0.109 259.3)
-
Step 800
800
#304F80
oklch(42.8% 0.09 259.2)
-
Step 900
900 (this color)
#273E63
oklch(36.4% 0.071 259.5)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#273E63 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) | #2F4165 | 0.015 |
| Deuteranopia (no green cones) | #273B62 | 0.009 |
| Tritanopia (no blue cones) | #00464C | 0.062 |
| Achromatopsia (no color) | #3E3E3E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273E63
#273E63
oklch(36.4% 0.071 259.5)
- #523907
#523907
oklch(36.4% 0.071 79)
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 #273E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.041
- Marine Blue #01386A ΔE 0.041
- Twilight Blue #0A437A ΔE 0.043
- Charcoal #264653 ΔE 0.043
- Midnight Green #073B4C ΔE 0.052
- Onyx #343A40 ΔE 0.061
Use #273E63 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.