#273F72
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.092 263.6), rgb(39, 63, 114).
Aa
White text reads best on this color (10.29:1).
About this color
#273F72 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.092 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.025 away. White text reads best on it, at 10.29:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.29:1 |
Values
| HEX | #273F72 |
| RGB | rgb(39, 63, 114) |
| HSL | hsl(221, 49%, 30%) |
| OKLCH | oklch(37.6% 0.092 263.6) |
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 #273F72 | 10.29:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #273F72 | 2.04:1 | Fails | Lc 10.2 | Not readable |
| #273F72 text on white | 10.29:1 | AAA | Lc 93.7 | Preferred for body text |
| #273F72 text on black | 2.04:1 | Fails | Lc -8.8 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7DA0E6
oklch(70.8% 0.11 263.5)
-
Step 500
500
#5C86DF
oklch(63.1% 0.142 263.7)
-
Step 600
600
#426ECC
oklch(55.6% 0.154 263.4)
-
Step 700
700
#345BB1
oklch(49% 0.144 263.6)
-
Step 800
800
#2C4B8F
oklch(42.7% 0.118 263.7)
-
Step 900
900 (this color)
#273F72
oklch(37.6% 0.092 263.6)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#273F72 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) | #284474 | 0.015 |
| Deuteranopia (no green cones) | #1C3D71 | 0.014 |
| Tritanopia (no blue cones) | #004B53 | 0.078 |
| Achromatopsia (no color) | #404040 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F72
#273F72
oklch(37.6% 0.092 263.6)
- #553D00
#553D00
oklch(37.7% 0.077 83.5)
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 #273F72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Marine Blue #01386A ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.050
- Cobalt #1E488F ΔE 0.052
- Light Navy #155084 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.063
- Charcoal #264653 ΔE 0.064
Use #273F72 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.