#273388
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.141 271.4), rgb(39, 51, 136).
Aa
White text reads best on this color (10.96:1).
About this color
#273388 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.141 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.054 away. White text reads best on it, at 10.96:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #273388 |
| RGB | rgb(39, 51, 136) |
| HSL | hsl(233, 55%, 34%) |
| OKLCH | oklch(36.8% 0.141 271.4) |
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 #273388 | 10.96:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #273388 | 1.91:1 | Fails | Lc 9.0 | Not readable |
| #273388 text on white | 10.96:1 | AAA | Lc 94.9 | Preferred for body text |
| #273388 text on black | 1.91:1 | Fails | Lc -7.7 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F99FF
oklch(70.8% 0.152 271.3)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#485AFA
oklch(55.6% 0.236 271.3)
-
Step 700
700
#3B48DA
oklch(49.1% 0.219 271.4)
-
Step 800
800
#303DB0
oklch(42.8% 0.181 271.3)
-
Step 900
900 (this color)
#273388
oklch(36.8% 0.141 271.4)
-
Step 950
950
#182151
oklch(27.1% 0.088 271.3)
#273388 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) | #00418B | 0.041 |
| Deuteranopia (no green cones) | #003886 | 0.031 |
| Tritanopia (no blue cones) | #004858 | 0.114 |
| Achromatopsia (no color) | #3C3C3C | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273388
#273388
oklch(36.8% 0.141 271.4)
- #4E3D00
#4E3D00
oklch(36.8% 0.075 91)
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 #273388, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.054
- Cobalt #1E488F ΔE 0.055
- Sapphire #2138AB ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.060
- Marine Blue #01386A ΔE 0.063
- Blueberry #464196 ΔE 0.066
- Royal #0C1793 ΔE 0.069
- Midnight Blue #191970 ΔE 0.080
Use #273388 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.