#303D69
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.078 269.9), rgb(48, 61, 105).
Aa
White text reads best on this color (10.51:1).
About this color
#303D69 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.078 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #303D69 |
| RGB | rgb(48, 61, 105) |
| HSL | hsl(226, 37%, 30%) |
| OKLCH | oklch(37.1% 0.078 269.9) |
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 #303D69 | 10.51:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #303D69 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #303D69 text on white | 10.51:1 | AAA | Lc 94.3 | Preferred for body text |
| #303D69 text on black | 1.99:1 | Fails | Lc -8.3 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E7
oklch(81% 0.057 269.6)
-
Step 400
400
#8A9EDB
oklch(70.7% 0.093 270)
-
Step 500
500
#6D85D2
oklch(63.2% 0.12 269.6)
-
Step 600
600
#566DBF
oklch(55.6% 0.13 270)
-
Step 700
700
#465BA4
oklch(49.1% 0.119 269.5)
-
Step 800
800
#3A4A85
oklch(42.6% 0.1 270.3)
-
Step 900
900 (this color)
#303D69
oklch(37.1% 0.078 269.9)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#303D69 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) | #2C426B | 0.015 |
| Deuteranopia (no green cones) | #253D68 | 0.014 |
| Tritanopia (no blue cones) | #16464E | 0.068 |
| Achromatopsia (no color) | #3F3F3F | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D69
#303D69
oklch(37.1% 0.078 269.9)
- #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 #303D69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.047
- Marine Blue #01386A ΔE 0.048
- Charcoal #264653 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.055
- Light Navy #155084 ΔE 0.066
- Cobalt #1E488F ΔE 0.067
Use #303D69 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.