#273759
Closest named color: Prussian Blue (#1D3557). oklch(34% 0.064 264.2), rgb(39, 55, 89).
Aa
White text reads best on this color (11.81:1).
About this color
#273759 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.064 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.015 away. White text reads best on it, at 11.81:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.81:1 |
Values
| HEX | #273759 |
| RGB | rgb(39, 55, 89) |
| HSL | hsl(221, 39%, 25%) |
| OKLCH | oklch(34% 0.064 264.2) |
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 #273759 | 11.81:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #273759 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #273759 text on white | 11.81:1 | AAA | Lc 97.0 | Preferred for body text |
| #273759 text on black | 1.77:1 | Fails | Lc 0.0 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0D9EB
oklch(88.4% 0.027 264.4)
-
Step 300
300
#B1C1E0
oklch(80.9% 0.047 263.7)
-
Step 400
400
#89A0D1
oklch(70.6% 0.077 265)
-
Step 500
500
#6B88C5
oklch(63% 0.098 264.3)
-
Step 600
600
#5371B2
oklch(55.5% 0.107 264.4)
-
Step 700
700
#445F99
oklch(49.2% 0.099 264.2)
-
Step 800
800
#384E7C
oklch(42.8% 0.082 263.9)
-
Step 900
900 (this color)
#273759
oklch(34% 0.064 264.2)
-
Step 950
950
#1C263A
oklch(26.9% 0.04 263.6)
#273759 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) | #2A3A5A | 0.011 |
| Deuteranopia (no green cones) | #243558 | 0.008 |
| Tritanopia (no blue cones) | #0F3E43 | 0.057 |
| Achromatopsia (no color) | #373737 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273759
#273759
oklch(34% 0.064 264.2)
- #473508
#473508
oklch(34% 0.064 85.2)
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 #273759, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.015
- Dark Blue Grey #1F3B4D ΔE 0.030
- Marine Blue #01386A ΔE 0.041
- Midnight Green #073B4C ΔE 0.042
- Gunmetal #293241 ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.048
- Marine #042E60 ΔE 0.050
Use #273759 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.