#273E70
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.091 263.9), rgb(39, 62, 112).
Aa
White text reads best on this color (10.45:1).
About this color
#273E70 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.091 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.028 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #273E70 |
| RGB | rgb(39, 62, 112) |
| HSL | hsl(221, 48%, 30%) |
| OKLCH | oklch(37.2% 0.091 263.9) |
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 #273E70 | 10.45:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #273E70 | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #273E70 text on white | 10.45:1 | AAA | Lc 94.1 | Preferred for body text |
| #273E70 text on black | 2.00:1 | Fails | Lc -8.5 | 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
#CDDAF3
oklch(88.6% 0.037 263.6)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7EA0E5
oklch(70.8% 0.108 263.8)
-
Step 500
500
#5D86DD
oklch(63% 0.139 263.8)
-
Step 600
600
#446ECB
oklch(55.6% 0.152 263.9)
-
Step 700
700
#365BAF
oklch(49% 0.141 264)
-
Step 800
800
#2D4B8E
oklch(42.7% 0.117 264)
-
Step 900
900 (this color)
#273E70
oklch(37.2% 0.091 263.9)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#273E70 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) | #274372 | 0.015 |
| Deuteranopia (no green cones) | #1D3C6F | 0.014 |
| Tritanopia (no blue cones) | #004951 | 0.077 |
| Achromatopsia (no color) | #3F3F3F | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273E70
#273E70
oklch(37.2% 0.091 263.9)
- #533C00
#533C00
oklch(37.2% 0.076 84.2)
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 #273E70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.028
- Marine Blue #01386A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.051
- Cobalt #1E488F ΔE 0.056
- Light Navy #155084 ΔE 0.057
- Charcoal #264653 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #273E70 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.