#273573
Closest named color: Marine Blue (#01386A). oklch(35.4% 0.108 270.4), rgb(39, 53, 115).
Aa
White text reads best on this color (11.39:1).
About this color
#273573 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.108 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.037 away. White text reads best on it, at 11.39:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.39:1 |
Values
| HEX | #273573 |
| RGB | rgb(39, 53, 115) |
| HSL | hsl(229, 49%, 30%) |
| OKLCH | oklch(35.4% 0.108 270.4) |
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 #273573 | 11.39:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #273573 | 1.84:1 | Fails | Lc 7.9 | Not readable |
| #273573 text on white | 11.39:1 | AAA | Lc 96.0 | Preferred for body text |
| #273573 text on black | 1.84:1 | Fails | Lc 0.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ACBFF6
oklch(81% 0.081 269.7)
-
Step 400
400
#829BF1
oklch(70.6% 0.129 270.5)
-
Step 500
500
#6480EC
oklch(63.1% 0.165 270.2)
-
Step 600
600
#4D66DB
oklch(55.6% 0.18 270.4)
-
Step 700
700
#3F54BE
oklch(49.1% 0.168 270.6)
-
Step 800
800
#344699
oklch(42.8% 0.137 270.4)
-
Step 900
900 (this color)
#273573
oklch(35.4% 0.108 270.4)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#273573 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) | #113D75 | 0.028 |
| Deuteranopia (no green cones) | #003772 | 0.032 |
| Tritanopia (no blue cones) | #00434E | 0.091 |
| Achromatopsia (no color) | #3A3A3A | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273573
#273573
oklch(35.4% 0.108 270.4)
- #4A3900
#4A3900
oklch(35.3% 0.072 89.9)
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 #273573, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.037
- Twilight Blue #0A437A ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.052
- Marine #042E60 ΔE 0.054
- Cobalt #1E488F ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.074
- Dark Blue Grey #1F3B4D ΔE 0.074
Use #273573 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.