#303D70
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.089 270.9), rgb(48, 61, 112).
Aa
White text reads best on this color (10.35:1).
About this color
#303D70 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.089 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.35:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.35:1 |
Values
| HEX | #303D70 |
| RGB | rgb(48, 61, 112) |
| HSL | hsl(228, 40%, 31%) |
| OKLCH | oklch(37.6% 0.089 270.9) |
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 #303D70 | 10.35:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #303D70 | 2.02:1 | Fails | Lc 10.0 | Not readable |
| #303D70 text on white | 10.35:1 | AAA | Lc 93.9 | Preferred for body text |
| #303D70 text on black | 2.02:1 | Fails | Lc -8.6 | 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
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B0BFED
oklch(80.9% 0.067 270.7)
-
Step 400
400
#889DE3
oklch(70.8% 0.106 270.8)
-
Step 500
500
#6B83DB
oklch(63.1% 0.135 270.6)
-
Step 600
600
#546AC9
oklch(55.5% 0.149 271)
-
Step 700
700
#4558AE
oklch(49.1% 0.138 271.1)
-
Step 800
800
#38498D
oklch(42.8% 0.114 270.4)
-
Step 900
900 (this color)
#303D70
oklch(37.6% 0.089 270.9)
-
Step 950
950
#1C2442
oklch(26.9% 0.057 270.9)
#303D70 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) | #274372 | 0.019 |
| Deuteranopia (no green cones) | #203D6F | 0.020 |
| Tritanopia (no blue cones) | #0E4851 | 0.079 |
| Achromatopsia (no color) | #404040 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D70
#303D70
oklch(37.6% 0.089 270.9)
- #513F00
#513F00
oklch(37.6% 0.077 90.4)
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 #303D70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.056
- Cobalt #1E488F ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.060
- Light Navy #155084 ΔE 0.061
- Charcoal #264653 ΔE 0.065
Use #303D70 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.