#303D63
Closest named color: Dark Grey Blue (#29465B). oklch(36.7% 0.068 268.6), rgb(48, 61, 99).
Aa
White text reads best on this color (10.64:1).
About this color
#303D63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.068 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 10.64:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.64:1 |
Values
| HEX | #303D63 |
| RGB | rgb(48, 61, 99) |
| HSL | hsl(225, 35%, 29%) |
| OKLCH | oklch(36.7% 0.068 268.6) |
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 #303D63 | 10.64:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #303D63 | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #303D63 text on white | 10.64:1 | AAA | Lc 94.6 | Preferred for body text |
| #303D63 text on black | 1.97:1 | Fails | Lc -8.0 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B3C0E3
oklch(80.9% 0.052 269.2)
-
Step 400
400
#8B9FD4
oklch(70.7% 0.081 268.3)
-
Step 500
500
#6F86C9
oklch(63% 0.105 268.9)
-
Step 600
600
#586FB6
oklch(55.6% 0.114 268.9)
-
Step 700
700
#485D9C
oklch(49.2% 0.104 268.5)
-
Step 800
800
#3B4C7F
oklch(42.7% 0.088 268.6)
-
Step 900
900 (this color)
#303D63
oklch(36.7% 0.068 268.6)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#303D63 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) | #2F4165 | 0.012 |
| Deuteranopia (no green cones) | #293C62 | 0.011 |
| Tritanopia (no blue cones) | #1B454B | 0.061 |
| Achromatopsia (no color) | #3E3E3E | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D63
#303D63
oklch(36.7% 0.068 268.6)
- #4E3D0B
#4E3D0B
oklch(36.9% 0.068 88.8)
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 #303D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.046
- Charcoal #264653 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.049
- Marine Blue #01386A ΔE 0.050
- Onyx #343A40 ΔE 0.060
- Midnight Green #073B4C ΔE 0.061
Use #303D63 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.