#303973
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.099 273.9), rgb(48, 57, 115).
Aa
White text reads best on this color (10.72:1).
About this color
#303973 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.099 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.041 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #303973 |
| RGB | rgb(48, 57, 115) |
| HSL | hsl(232, 41%, 32%) |
| OKLCH | oklch(36.9% 0.099 273.9) |
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 #303973 | 10.72:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #303973 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #303973 text on white | 10.72:1 | AAA | Lc 94.7 | Preferred for body text |
| #303973 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F5
oklch(88.5% 0.041 273.3)
-
Step 300
300
#B1BEF1
oklch(80.9% 0.074 273.5)
-
Step 400
400
#899AEB
oklch(70.6% 0.12 273.9)
-
Step 500
500
#6E7FE4
oklch(63% 0.152 274)
-
Step 600
600
#5766D2
oklch(55.5% 0.165 273.8)
-
Step 700
700
#4854B6
oklch(49% 0.154 274)
-
Step 800
800
#3B4693
oklch(42.8% 0.126 273.7)
-
Step 900
900 (this color)
#303973
oklch(36.9% 0.099 273.9)
-
Step 950
950
#1D2345
oklch(27% 0.063 273.9)
#303973 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) | #1D4175 | 0.029 |
| Deuteranopia (no green cones) | #143B72 | 0.031 |
| Tritanopia (no blue cones) | #0B4650 | 0.088 |
| Achromatopsia (no color) | #3E3E3E | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303973
#303973
oklch(36.9% 0.099 273.9)
- #4D3E00
#4D3E00
oklch(36.9% 0.076 93.4)
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 #303973, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.041
- Marine Blue #01386A ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.057
- Cobalt #1E488F ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.064
- Light Navy #155084 ΔE 0.069
- Marine #042E60 ΔE 0.069
Use #303973 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.