#303D6D
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.084 270.5), rgb(48, 61, 109).
Aa
White text reads best on this color (10.42:1).
About this color
#303D6D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.084 and its hue 270°. 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 10.42:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.42:1 |
Values
| HEX | #303D6D |
| RGB | rgb(48, 61, 109) |
| HSL | hsl(227, 39%, 31%) |
| OKLCH | oklch(37.4% 0.084 270.5) |
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 #303D6D | 10.42:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #303D6D | 2.01:1 | Fails | Lc 9.9 | Not readable |
| #303D6D text on white | 10.42:1 | AAA | Lc 94.1 | Preferred for body text |
| #303D6D text on black | 2.01:1 | Fails | Lc -8.5 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D9F1
oklch(88.6% 0.034 269.3)
-
Step 300
300
#B1BFEA
oklch(80.8% 0.063 270.8)
-
Step 400
400
#899DE0
oklch(70.7% 0.101 270.9)
-
Step 500
500
#6C84D7
oklch(63.2% 0.128 270.2)
-
Step 600
600
#556CC5
oklch(55.7% 0.14 270.4)
-
Step 700
700
#4559AA
oklch(49% 0.131 270.5)
-
Step 800
800
#39498A
oklch(42.6% 0.109 270.8)
-
Step 900
900 (this color)
#303D6D
oklch(37.4% 0.084 270.5)
-
Step 950
950
#1D2540
oklch(27.1% 0.052 270.2)
#303D6D 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) | #29426F | 0.016 |
| Deuteranopia (no green cones) | #223D6C | 0.018 |
| Tritanopia (no blue cones) | #12474F | 0.075 |
| Achromatopsia (no color) | #404040 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D6D
#303D6D
oklch(37.4% 0.084 270.5)
- #503E00
#503E00
oklch(37.3% 0.076 90.1)
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 #303D6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.048
- Marine Blue #01386A ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.052
- Charcoal #264653 ΔE 0.061
- Cobalt #1E488F ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.062
- Light Navy #155084 ΔE 0.063
Use #303D6D 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.