#303259
Closest named color: Prussian Blue (#1D3557). oklch(33.5% 0.068 279.8), rgb(48, 50, 89).
Aa
White text reads best on this color (12.16:1).
About this color
#303259 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.068 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.028 away. White text reads best on it, at 12.16:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.72:1 |
| White text | 12.16:1 |
Values
| HEX | #303259 |
| RGB | rgb(48, 50, 89) |
| HSL | hsl(237, 30%, 27%) |
| OKLCH | oklch(33.5% 0.068 279.8) |
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 #303259 | 12.16:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #303259 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #303259 text on white | 12.16:1 | AAA | Lc 97.7 | Preferred for body text |
| #303259 text on black | 1.72:1 | Fails | Lc 0.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D5D8EC
oklch(88.6% 0.028 279)
-
Step 300
300
#B9BEE2
oklch(80.9% 0.051 279)
-
Step 400
400
#969BD3
oklch(70.6% 0.082 280.1)
-
Step 500
500
#7D82C8
oklch(63.1% 0.105 279.8)
-
Step 600
600
#676AB4
oklch(55.5% 0.114 280.2)
-
Step 700
700
#55589B
oklch(49% 0.106 279.8)
-
Step 800
800
#46497E
oklch(42.8% 0.087 279.6)
-
Step 900
900 (this color)
#303259
oklch(33.5% 0.068 279.8)
-
Step 950
950
#22243B
oklch(27% 0.043 279.3)
#303259 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) | #24375B | 0.021 |
| Deuteranopia (no green cones) | #213458 | 0.022 |
| Tritanopia (no blue cones) | #233A41 | 0.060 |
| Achromatopsia (no color) | #363636 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303259
#303259
oklch(33.5% 0.068 279.8)
- #3F3702
#3F3702
oklch(33.5% 0.068 100)
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 #303259, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.028
- Space Cadet #2B2D42 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.045
- Gunmetal #293241 ΔE 0.046
- Marine Blue #01386A ΔE 0.052
- Marine #042E60 ΔE 0.054
- Onyx #343A40 ΔE 0.058
- Midnight Green #073B4C ΔE 0.058
Use #303259 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.