#303E73
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.092 270.4), rgb(48, 62, 115).
Aa
White text reads best on this color (10.18:1).
About this color
#303E73 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.092 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.18:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.06:1 |
| White text | 10.18:1 |
Values
| HEX | #303E73 |
| RGB | rgb(48, 62, 115) |
| HSL | hsl(227, 41%, 32%) |
| OKLCH | oklch(38% 0.092 270.4) |
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 #303E73 | 10.18:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #303E73 | 2.06:1 | Fails | Lc 10.5 | Not readable |
| #303E73 text on white | 10.18:1 | AAA | Lc 93.5 | Preferred for body text |
| #303E73 text on black | 2.06:1 | Fails | Lc -9.0 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5EAF8
oklch(93.7% 0.02 270.2)
-
Step 200
200
#CFD8F3
oklch(88.4% 0.038 271)
-
Step 300
300
#AFBFEE
oklch(80.9% 0.069 270.1)
-
Step 400
400
#869DE6
oklch(70.8% 0.11 270.1)
-
Step 500
500
#6982DE
oklch(63% 0.141 270.5)
-
Step 600
600
#526ACC
oklch(55.6% 0.153 270.4)
-
Step 700
700
#4358B1
oklch(49.2% 0.143 270.4)
-
Step 800
800
#37488F
oklch(42.6% 0.119 270.5)
-
Step 900
900 (this color)
#303E73
oklch(38% 0.092 270.4)
-
Step 950
950
#1C2443
oklch(27% 0.059 271.1)
#303E73 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) | #274475 | 0.019 |
| Deuteranopia (no green cones) | #1E3E72 | 0.021 |
| Tritanopia (no blue cones) | #094A53 | 0.082 |
| Achromatopsia (no color) | #414141 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303E73
#303E73
oklch(38% 0.092 270.4)
- #524000
#524000
oklch(38% 0.078 90.6)
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 #303E73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Marine Blue #01386A ΔE 0.052
- Cobalt #1E488F ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.056
- Light Navy #155084 ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.068
Use #303E73 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.