#273F70
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.089 263.1), rgb(39, 63, 112).
Aa
White text reads best on this color (10.33:1).
About this color
#273F70 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.089 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.33:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.03:1 |
| White text | 10.33:1 |
Values
| HEX | #273F70 |
| RGB | rgb(39, 63, 112) |
| HSL | hsl(220, 48%, 30%) |
| OKLCH | oklch(37.5% 0.089 263.1) |
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 #273F70 | 10.33:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #273F70 | 2.03:1 | Fails | Lc 10.1 | Not readable |
| #273F70 text on white | 10.33:1 | AAA | Lc 93.8 | Preferred for body text |
| #273F70 text on black | 2.03:1 | Fails | Lc -8.7 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1ED
oklch(80.9% 0.067 263.3)
-
Step 400
400
#7DA0E4
oklch(70.7% 0.108 263)
-
Step 500
500
#5C87DC
oklch(63.1% 0.137 262.8)
-
Step 600
600
#436FCA
oklch(55.7% 0.149 263)
-
Step 700
700
#355CAE
oklch(49.1% 0.138 263.1)
-
Step 800
800
#2C4C8D
oklch(42.8% 0.114 262.8)
-
Step 900
900 (this color)
#273F70
oklch(37.5% 0.089 263.1)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#273F70 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) | #294472 | 0.016 |
| Deuteranopia (no green cones) | #1E3D6F | 0.013 |
| Tritanopia (no blue cones) | #004A52 | 0.075 |
| Achromatopsia (no color) | #404040 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F70
#273F70
oklch(37.5% 0.089 263.1)
- #553C00
#553C00
oklch(37.4% 0.077 82.1)
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 #273F70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.052
- Cobalt #1E488F ΔE 0.055
- Light Navy #155084 ΔE 0.055
- Charcoal #264653 ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #273F70 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.