#303571
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.102 276.4), rgb(48, 53, 113).
Aa
White text reads best on this color (11.20:1).
About this color
#303571 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.102 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.047 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #303571 |
| RGB | rgb(48, 53, 113) |
| HSL | hsl(235, 40%, 32%) |
| OKLCH | oklch(35.9% 0.102 276.4) |
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 #303571 | 11.20:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #303571 | 1.87:1 | Fails | Lc 8.2 | Not readable |
| #303571 text on white | 11.20:1 | AAA | Lc 95.7 | Preferred for body text |
| #303571 text on black | 1.87:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF2
oklch(80.9% 0.076 276.3)
-
Step 400
400
#8D99EC
oklch(70.7% 0.122 276.5)
-
Step 500
500
#727DE6
oklch(63% 0.157 276.4)
-
Step 600
600
#5C64D4
oklch(55.6% 0.17 276.3)
-
Step 700
700
#4C52B8
oklch(49.1% 0.158 276.3)
-
Step 800
800
#3E4495
oklch(42.7% 0.131 276.2)
-
Step 900
900 (this color)
#303571
oklch(35.9% 0.102 276.4)
-
Step 950
950
#1F2245
oklch(26.9% 0.064 277.4)
#303571 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) | #163E73 | 0.036 |
| Deuteranopia (no green cones) | #0D3870 | 0.037 |
| Tritanopia (no blue cones) | #0F424D | 0.090 |
| Achromatopsia (no color) | #3B3B3B | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303571
#303571
oklch(35.9% 0.102 276.4)
- #483C00
#483C00
oklch(35.8% 0.074 96.4)
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 #303571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.047
- Twilight Blue #0A437A ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.054
- Marine #042E60 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.063
- Cobalt #1E488F ΔE 0.068
- Dark Grey Blue #29465B ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.074
Use #303571 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.