#31338C
Closest named color: Dark Slate Blue (#483D8B). oklch(37.8% 0.144 276), rgb(49, 51, 140).
Aa
White text reads best on this color (10.59:1).
About this color
#31338C is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.144 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 10.59:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.98:1 |
| White text | 10.59:1 |
Values
| HEX | #31338C |
| RGB | rgb(49, 51, 140) |
| HSL | hsl(239, 48%, 37%) |
| OKLCH | oklch(37.8% 0.144 276) |
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 #31338C | 10.59:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #31338C | 1.98:1 | Fails | Lc 9.8 | Not readable |
| #31338C text on white | 10.59:1 | AAA | Lc 94.1 | Preferred for body text |
| #31338C text on black | 1.98:1 | Fails | Lc -8.5 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8896FF
oklch(70.8% 0.153 276)
-
Step 500
500
#6D76FF
oklch(63% 0.2 276.2)
-
Step 600
600
#5754FB
oklch(55.6% 0.24 276)
-
Step 700
700
#4842DB
oklch(49.1% 0.224 276)
-
Step 800
800
#3B38B1
oklch(42.7% 0.185 276.2)
-
Step 900
900 (this color)
#31338C
oklch(37.8% 0.144 276)
-
Step 950
950
#1C1F52
oklch(27% 0.092 275.9)
#31338C 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) | #00438F | 0.051 |
| Deuteranopia (no green cones) | #003B8A | 0.043 |
| Tritanopia (no blue cones) | #00495A | 0.120 |
| Achromatopsia (no color) | #3F3F3F | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31338C
#31338C
oklch(37.8% 0.144 276)
- #4E4100
#4E4100
oklch(37.8% 0.078 96.2)
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 #31338C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.053
- Cobalt #1E488F ΔE 0.055
- Sapphire #2138AB ΔE 0.055
- Twilight Blue #0A437A ΔE 0.062
- Indigo Blue #3A18B1 ΔE 0.072
- Imperial Purple #480CA8 ΔE 0.076
- Marine Blue #01386A ΔE 0.076
Use #31338C 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.