#273F74
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.096 264), rgb(39, 63, 116).
Aa
White text reads best on this color (10.24:1).
About this color
#273F74 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.096 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.024 away. White text reads best on it, at 10.24:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.24:1 |
Values
| HEX | #273F74 |
| RGB | rgb(39, 63, 116) |
| HSL | hsl(221, 50%, 30%) |
| OKLCH | oklch(37.7% 0.096 264) |
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 #273F74 | 10.24:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #273F74 | 2.04:1 | Fails | Lc 10.4 | Not readable |
| #273F74 text on white | 10.24:1 | AAA | Lc 93.6 | Preferred for body text |
| #273F74 text on black | 2.04:1 | Fails | Lc -8.9 | 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
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1F0
oklch(80.9% 0.072 263.7)
-
Step 400
400
#7C9FE8
oklch(70.6% 0.114 264.1)
-
Step 500
500
#5B86E1
oklch(63.2% 0.145 263.7)
-
Step 600
600
#426DCF
oklch(55.6% 0.159 264.1)
-
Step 700
700
#345BB4
oklch(49.2% 0.148 264)
-
Step 800
800
#2B4A91
oklch(42.6% 0.123 264.1)
-
Step 900
900 (this color)
#273F74
oklch(37.7% 0.096 264)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#273F74 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) | #264576 | 0.018 |
| Deuteranopia (no green cones) | #1A3D73 | 0.016 |
| Tritanopia (no blue cones) | #004B53 | 0.081 |
| Achromatopsia (no color) | #414141 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F74
#273F74
oklch(37.7% 0.096 264)
- #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 #273F74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.024
- Marine Blue #01386A ΔE 0.043
- Cobalt #1E488F ΔE 0.049
- Light Navy #155084 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.063
Use #273F74 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.