#303770
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.097 275.2), rgb(48, 55, 112).
Aa
White text reads best on this color (11.01:1).
About this color
#303770 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.097 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.045 away. White text reads best on it, at 11.01:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.01:1 |
Values
| HEX | #303770 |
| RGB | rgb(48, 55, 112) |
| HSL | hsl(233, 40%, 31%) |
| OKLCH | oklch(36.2% 0.097 275.2) |
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 #303770 | 11.01:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #303770 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #303770 text on white | 11.01:1 | AAA | Lc 95.3 | Preferred for body text |
| #303770 text on black | 1.90:1 | Fails | Lc -7.3 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F5
oklch(88.6% 0.041 274.8)
-
Step 300
300
#B2BDF0
oklch(80.7% 0.073 275.2)
-
Step 400
400
#8C9AE9
oklch(70.7% 0.117 275.4)
-
Step 500
500
#717FE2
oklch(63.1% 0.149 275.2)
-
Step 600
600
#5A66D0
oklch(55.6% 0.162 275)
-
Step 700
700
#4B54B4
oklch(49.1% 0.15 275.4)
-
Step 800
800
#3D4592
oklch(42.6% 0.125 275.3)
-
Step 900
900 (this color)
#303770
oklch(36.2% 0.097 275.2)
-
Step 950
950
#1E2344
oklch(27% 0.061 275)
#303770 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) | #1C3F72 | 0.030 |
| Deuteranopia (no green cones) | #143A6F | 0.032 |
| Tritanopia (no blue cones) | #10444E | 0.086 |
| Achromatopsia (no color) | #3C3C3C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303770
#303770
oklch(36.2% 0.097 275.2)
- #4A3D00
#4A3D00
oklch(36.3% 0.075 95.4)
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 #303770, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.045
- Marine Blue #01386A ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.062
- Marine #042E60 ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.065
- Cobalt #1E488F ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.070
Use #303770 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.