#3A4375
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.085 274.2), rgb(58, 67, 117).
Aa
White text reads best on this color (9.37:1).
About this color
#3A4375 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.085 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.047 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.23:1 |
| White text | 9.37:1 |
Values
| HEX | #3A4375 |
| RGB | rgb(58, 67, 117) |
| HSL | hsl(231, 34%, 34%) |
| OKLCH | oklch(40% 0.085 274.2) |
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 #3A4375 | 9.37:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #3A4375 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #3A4375 text on white | 9.37:1 | AAA | Lc 91.6 | Preferred for body text |
| #3A4375 text on black | 2.23:1 | Fails | Lc -10.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F1
oklch(88.5% 0.035 274.9)
-
Step 300
300
#B4BEEA
oklch(80.9% 0.063 274.9)
-
Step 400
400
#8D9CE0
oklch(70.8% 0.101 274)
-
Step 500
500
#7282D7
oklch(63.1% 0.129 274.1)
-
Step 600
600
#5B6AC5
oklch(55.7% 0.141 273.9)
-
Step 700
700
#4B57AA
oklch(49% 0.132 274.3)
-
Step 800
800
#3E488A
oklch(42.8% 0.109 274.4)
-
Step 900
900 (this color)
#3A4375
oklch(40% 0.085 274.2)
-
Step 950
950
#1F2440
oklch(27% 0.052 274.7)
#3A4375 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) | #304977 | 0.020 |
| Deuteranopia (no green cones) | #2A4474 | 0.021 |
| Tritanopia (no blue cones) | #234D56 | 0.075 |
| Achromatopsia (no color) | #464646 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4375
#3A4375
oklch(40% 0.085 274.2)
- #564600
#564600
oklch(39.9% 0.082 94)
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 #3A4375, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.047
- Light Navy #155084 ΔE 0.050
- Cobalt #1E488F ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.054
- Dusk Blue #26538D ΔE 0.056
- Blueberry #464196 ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.060
Use #3A4375 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.