#39437C
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.096 273.8), rgb(57, 67, 124).
Aa
White text reads best on this color (9.25:1).
About this color
#39437C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.096 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.038 away. White text reads best on it, at 9.25:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #39437C |
| RGB | rgb(57, 67, 124) |
| HSL | hsl(231, 37%, 35%) |
| OKLCH | oklch(40.4% 0.096 273.8) |
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 #39437C | 9.25:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #39437C | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #39437C text on white | 9.25:1 | AAA | Lc 91.2 | Preferred for body text |
| #39437C text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B5BFE6
oklch(81% 0.056 273.8)
-
Step 400
400
#8F9DD9
oklch(70.8% 0.089 273.8)
-
Step 500
500
#7483CF
oklch(63.1% 0.116 274.1)
-
Step 600
600
#5D6CBC
oklch(55.7% 0.125 273.7)
-
Step 700
700
#4D5AA2
oklch(49.2% 0.116 273.7)
-
Step 800
800 (this color)
#39437C
oklch(40.4% 0.096 273.8)
-
Step 900
900
#353E69
oklch(37.7% 0.074 273.4)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#39437C 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) | #2B4A7E | 0.024 |
| Deuteranopia (no green cones) | #24457B | 0.026 |
| Tritanopia (no blue cones) | #1B4F59 | 0.085 |
| Achromatopsia (no color) | #474747 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39437C
#39437C
oklch(40.4% 0.096 273.8)
- #584700
#584700
oklch(40.4% 0.083 93.2)
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 #39437C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.038
- Cobalt #1E488F ΔE 0.042
- Twilight Blue #0A437A ΔE 0.045
- Light Navy #155084 ΔE 0.047
- Blueberry #464196 ΔE 0.049
- Dusk Blue #26538D ΔE 0.051
- Twilight #4E518B ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.059
Use #39437C 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.