#273B59
Closest named color: Prussian Blue (#1D3557). oklch(35% 0.059 258.3), rgb(39, 59, 89).
Aa
White text reads best on this color (11.31:1).
About this color
#273B59 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.059 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.024 away. White text reads best on it, at 11.31:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #273B59 |
| RGB | rgb(39, 59, 89) |
| HSL | hsl(216, 39%, 25%) |
| OKLCH | oklch(35% 0.059 258.3) |
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 #273B59 | 11.31:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #273B59 | 1.85:1 | Fails | Lc 7.9 | Not readable |
| #273B59 text on white | 11.31:1 | AAA | Lc 96.0 | Preferred for body text |
| #273B59 text on black | 1.85:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#B0C2DE
oklch(80.9% 0.044 259.2)
-
Step 400
400
#86A2CD
oklch(70.7% 0.071 258.8)
-
Step 500
500
#678BC0
oklch(63.2% 0.09 257.9)
-
Step 600
600
#4F74AC
oklch(55.6% 0.097 258.4)
-
Step 700
700
#3F6194
oklch(49.1% 0.091 258.3)
-
Step 800
800
#344F78
oklch(42.6% 0.076 258.5)
-
Step 900
900 (this color)
#273B59
oklch(35% 0.059 258.3)
-
Step 950
950
#1B2739
oklch(27.1% 0.038 258.3)
#273B59 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) | #2F3D5A | 0.013 |
| Deuteranopia (no green cones) | #293858 | 0.009 |
| Tritanopia (no blue cones) | #0E4246 | 0.052 |
| Achromatopsia (no color) | #3A3A3A | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273B59
#273B59
oklch(35% 0.059 258.3)
- #4B3613
#4B3613
oklch(34.9% 0.058 77.4)
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 #273B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.025
- Dark Grey Blue #29465B ΔE 0.036
- Midnight Green #073B4C ΔE 0.039
- Charcoal #264653 ΔE 0.040
- Marine Blue #01386A ΔE 0.045
- Gunmetal #293241 ΔE 0.045
- Onyx #343A40 ΔE 0.046
Use #273B59 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.