#303C81
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.116 272.4), rgb(48, 60, 129).
Aa
White text reads best on this color (10.05:1).
About this color
#303C81 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.116 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 10.05:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #303C81 |
| RGB | rgb(48, 60, 129) |
| HSL | hsl(231, 46%, 35%) |
| OKLCH | oklch(38.6% 0.116 272.4) |
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 #303C81 | 10.05:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #303C81 | 2.08:1 | Fails | Lc 10.9 | Not readable |
| #303C81 text on white | 10.05:1 | AAA | Lc 93.1 | Preferred for body text |
| #303C81 text on black | 2.08:1 | Fails | Lc -9.4 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#ADBEFA
oklch(81% 0.087 272.1)
-
Step 400
400
#8399F7
oklch(70.6% 0.14 272.4)
-
Step 500
500
#677DF4
oklch(63.2% 0.178 272.4)
-
Step 600
600
#5062E2
oklch(55.5% 0.194 272.4)
-
Step 700
700
#4250C5
oklch(49.1% 0.181 272.6)
-
Step 800
800
#36439F
oklch(42.8% 0.149 272.4)
-
Step 900
900 (this color)
#303C81
oklch(38.6% 0.116 272.4)
-
Step 950
950
#1B224A
oklch(27% 0.074 273)
#303C81 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) | #144683 | 0.035 |
| Deuteranopia (no green cones) | #003F80 | 0.039 |
| Tritanopia (no blue cones) | #004C58 | 0.101 |
| Achromatopsia (no color) | #424242 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303C81
#303C81
oklch(38.6% 0.116 272.4)
- #534200
#534200
oklch(38.6% 0.079 92.2)
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 #303C81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Cobalt #1E488F ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.051
- Light Navy #155084 ΔE 0.058
- Marine Blue #01386A ΔE 0.062
- Dusk Blue #26538D ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.071
Use #303C81 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.