#303C69
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.079 270.8), rgb(48, 60, 105).
Aa
White text reads best on this color (10.62:1).
About this color
#303C69 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.079 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #303C69 |
| RGB | rgb(48, 60, 105) |
| HSL | hsl(227, 37%, 30%) |
| OKLCH | oklch(36.9% 0.079 270.8) |
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 #303C69 | 10.62:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #303C69 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #303C69 text on white | 10.62:1 | AAA | Lc 94.5 | Preferred for body text |
| #303C69 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D1D9F0
oklch(88.6% 0.033 270.4)
-
Step 300
300
#B2BFE8
oklch(80.8% 0.06 271.2)
-
Step 400
400
#8A9DDC
oklch(70.6% 0.095 270.9)
-
Step 500
500
#6E84D3
oklch(63.1% 0.122 270.8)
-
Step 600
600
#576CC0
oklch(55.5% 0.132 271)
-
Step 700
700
#475AA6
oklch(49.1% 0.123 270.7)
-
Step 800
800
#3B4A86
oklch(42.7% 0.101 271)
-
Step 900
900 (this color)
#303C69
oklch(36.9% 0.079 270.8)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#303C69 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) | #2A416B | 0.016 |
| Deuteranopia (no green cones) | #243C68 | 0.016 |
| Tritanopia (no blue cones) | #17464D | 0.071 |
| Achromatopsia (no color) | #3E3E3E | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303C69
#303C69
oklch(36.9% 0.079 270.8)
- #4E3D00
#4E3D00
oklch(36.8% 0.075 91)
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 #303C69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.046
- Marine Blue #01386A ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.056
- Charcoal #264653 ΔE 0.057
- Light Navy #155084 ΔE 0.068
- Cobalt #1E488F ΔE 0.068
Use #303C69 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.