#31348A
Closest named color: Dark Slate Blue (#483D8B). oklch(37.8% 0.14 275.9), rgb(49, 52, 138).
Aa
White text reads best on this color (10.55:1).
About this color
#31348A is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.140 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.55:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.98:1 |
| White text | 10.55:1 |
Values
| HEX | #31348A |
| RGB | rgb(49, 52, 138) |
| HSL | hsl(238, 48%, 37%) |
| OKLCH | oklch(37.8% 0.14 275.9) |
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 #31348A | 10.55:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #31348A | 1.98:1 | Fails | Lc 9.9 | Not readable |
| #31348A text on white | 10.55:1 | AAA | Lc 94.1 | Preferred for body text |
| #31348A 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
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500
#6C77FF
oklch(63.2% 0.199 275.6)
-
Step 600
600
#5756F7
oklch(55.6% 0.233 276)
-
Step 700
700
#4844D8
oklch(49.1% 0.218 275.9)
-
Step 800
800
#3A3AAE
oklch(42.7% 0.179 275.7)
-
Step 900
900 (this color)
#31348A
oklch(37.8% 0.14 275.9)
-
Step 950
950
#1C1F51
oklch(27% 0.09 276)
#31348A 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) | #00438D | 0.050 |
| Deuteranopia (no green cones) | #003B88 | 0.043 |
| Tritanopia (no blue cones) | #00495A | 0.116 |
| Achromatopsia (no color) | #3F3F3F | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31348A
#31348A
oklch(37.8% 0.14 275.9)
- #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 #31348A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.053
- Cobalt #1E488F ΔE 0.053
- Sapphire #2138AB ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Marine Blue #01386A ΔE 0.073
- Indigo Blue #3A18B1 ΔE 0.076
- Light Navy #155084 ΔE 0.079
Use #31348A 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.