#31408B
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.125 271.2), rgb(49, 64, 139).
Aa
White text reads best on this color (9.38:1).
About this color
#31408B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.125 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 9.38:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.23:1 |
| White text | 9.38:1 |
Values
| HEX | #31408B |
| RGB | rgb(49, 64, 139) |
| HSL | hsl(230, 48%, 37%) |
| OKLCH | oklch(40.3% 0.125 271.2) |
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 #31408B | 9.38:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #31408B | 2.23:1 | Fails | Lc 12.6 | Not readable |
| #31408B text on white | 9.38:1 | AAA | Lc 91.4 | Preferred for body text |
| #31408B text on black | 2.23:1 | Fails | Lc -11.0 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AFBFF1
oklch(81% 0.073 270.9)
-
Step 400
400
#869CEA
oklch(70.8% 0.117 271.2)
-
Step 500
500
#6981E3
oklch(63.1% 0.15 271.2)
-
Step 600
600
#5268D1
oklch(55.5% 0.163 271.3)
-
Step 700
700
#4356B5
oklch(49.1% 0.151 271.3)
-
Step 800
800 (this color)
#31408B
oklch(40.3% 0.125 271.2)
-
Step 900
900
#2F3C75
oklch(37.6% 0.098 271.3)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#31408B 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) | #114B8E | 0.037 |
| Deuteranopia (no green cones) | #004389 | 0.037 |
| Tritanopia (no blue cones) | #00525F | 0.107 |
| Achromatopsia (no color) | #464646 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31408B
#31408B
oklch(40.3% 0.125 271.2)
- #594600
#594600
oklch(40.3% 0.082 91)
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 #31408B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.046
- Light Navy #155084 ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Sapphire #2138AB ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.066
Use #31408B 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.