#303D64
Closest named color: Dark Grey Blue (#29465B). oklch(36.8% 0.07 268.9), rgb(48, 61, 100).
Aa
White text reads best on this color (10.62:1).
About this color
#303D64 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.070 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.037 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #303D64 |
| RGB | rgb(48, 61, 100) |
| HSL | hsl(225, 35%, 29%) |
| OKLCH | oklch(36.8% 0.07 268.9) |
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 #303D64 | 10.62:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #303D64 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #303D64 text on white | 10.62:1 | AAA | Lc 94.5 | Preferred for body text |
| #303D64 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
#8B9FD5
oklch(70.7% 0.083 268.6)
-
Step 500
500
#6F86CA
oklch(63.1% 0.106 269)
-
Step 600
600
#576FB7
oklch(55.6% 0.116 268.5)
-
Step 700
700
#485C9E
oklch(49.1% 0.109 269.4)
-
Step 800
800
#3B4C80
oklch(42.8% 0.089 268.8)
-
Step 900
900 (this color)
#303D64
oklch(36.8% 0.07 268.9)
-
Step 950
950
#1D253C
oklch(26.9% 0.045 268.7)
#303D64 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) | #2E4166 | 0.012 |
| Deuteranopia (no green cones) | #293C63 | 0.011 |
| Tritanopia (no blue cones) | #1B454B | 0.062 |
| Achromatopsia (no color) | #3E3E3E | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D64
#303D64
oklch(36.8% 0.07 268.9)
- #4E3D09
#4E3D09
oklch(36.8% 0.07 89.2)
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 #303D64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.048
- Charcoal #264653 ΔE 0.048
- Marine Blue #01386A ΔE 0.049
- Onyx #343A40 ΔE 0.062
- Midnight Green #073B4C ΔE 0.062
Use #303D64 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.