#31437B
Closest named color: Twilight Blue (#0A437A). oklch(39.8% 0.097 268.3), rgb(49, 67, 123).
Aa
White text reads best on this color (9.46:1).
About this color
#31437B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.097 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.034 away. White text reads best on it, at 9.46:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.21:1 |
| White text | 9.46:1 |
Values
| HEX | #31437B |
| RGB | rgb(49, 67, 123) |
| HSL | hsl(225, 43%, 34%) |
| OKLCH | oklch(39.8% 0.097 268.3) |
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 #31437B | 9.46:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #31437B | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #31437B text on white | 9.46:1 | AAA | Lc 91.7 | Preferred for body text |
| #31437B text on black | 2.21:1 | Fails | Lc -10.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#ADC0F1
oklch(81% 0.073 268.2)
-
Step 400
400
#829DEA
oklch(70.7% 0.117 268.6)
-
Step 500
500
#6483E3
oklch(63.2% 0.149 268.4)
-
Step 600
600
#4C6AD1
oklch(55.6% 0.162 268.5)
-
Step 700
700
#3D58B5
oklch(49.1% 0.151 268.2)
-
Step 800
800
#324892
oklch(42.6% 0.125 268.3)
-
Step 900
900 (this color)
#31437B
oklch(39.8% 0.097 268.3)
-
Step 950
950
#1A2444
oklch(26.9% 0.061 268.9)
#31437B 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) | #2A497D | 0.018 |
| Deuteranopia (no green cones) | #20437A | 0.019 |
| Tritanopia (no blue cones) | #004F59 | 0.085 |
| Achromatopsia (no color) | #464646 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31437B
#31437B
oklch(39.8% 0.097 268.3)
- #594400
#594400
oklch(39.8% 0.081 88.6)
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 #31437B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.034
- Cobalt #1E488F ΔE 0.037
- Light Navy #155084 ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.047
- Dusk Blue #26538D ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.054
- Blueberry #464196 ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.060
Use #31437B 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.