#31377E
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.119 275.4), rgb(49, 55, 126).
Aa
White text reads best on this color (10.61:1).
About this color
#31377E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.119 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #31377E |
| RGB | rgb(49, 55, 126) |
| HSL | hsl(235, 44%, 34%) |
| OKLCH | oklch(37.4% 0.119 275.4) |
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 #31377E | 10.61:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #31377E | 1.97:1 | Fails | Lc 9.6 | Not readable |
| #31377E text on white | 10.61:1 | AAA | Lc 94.3 | Preferred for body text |
| #31377E text on black | 1.97:1 | Fails | Lc -8.2 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#B0BCFA
oklch(80.8% 0.089 275.8)
-
Step 400
400
#8897F8
oklch(70.6% 0.142 275.5)
-
Step 500
500
#6D7AF5
oklch(63.1% 0.182 275.4)
-
Step 600
600
#585FE4
oklch(55.6% 0.198 275.6)
-
Step 700
700
#484EC6
oklch(49.2% 0.183 275.2)
-
Step 800
800
#3B40A0
oklch(42.6% 0.153 275.5)
-
Step 900
900 (this color)
#31377E
oklch(37.4% 0.119 275.4)
-
Step 950
950
#1D214A
oklch(26.9% 0.075 275.9)
#31377E 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) | #074280 | 0.043 |
| Deuteranopia (no green cones) | #003B7D | 0.043 |
| Tritanopia (no blue cones) | #004855 | 0.104 |
| Achromatopsia (no color) | #3E3E3E | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31377E
#31377E
oklch(37.4% 0.119 275.4)
- #4D4000
#4D4000
oklch(37.4% 0.077 96)
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 #31377E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.047
- Cobalt #1E488F ΔE 0.052
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.059
- Light Navy #155084 ΔE 0.071
- Prussian Blue #1D3557 ΔE 0.074
- Sapphire #2138AB ΔE 0.076
Use #31377E 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.