#39437D
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.098 273.9), rgb(57, 67, 125).
Aa
White text reads best on this color (9.23:1).
About this color
#39437D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #39437D |
| RGB | rgb(57, 67, 125) |
| HSL | hsl(231, 37%, 36%) |
| OKLCH | oklch(40.4% 0.098 273.9) |
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 #39437D | 9.23:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #39437D | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #39437D text on white | 9.23:1 | AAA | Lc 91.2 | Preferred for body text |
| #39437D text on black | 2.27:1 | Fails | Lc -11.2 | 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 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
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B5BFE6
oklch(81% 0.056 273.8)
-
Step 400
400
#8E9DDA
oklch(70.8% 0.091 273.2)
-
Step 500
500
#7483D0
oklch(63.1% 0.117 274.2)
-
Step 600
600
#5D6BBD
oklch(55.5% 0.128 274.2)
-
Step 700
700
#4D59A3
oklch(49.1% 0.119 274.3)
-
Step 800
800 (this color)
#39437D
oklch(40.4% 0.098 273.9)
-
Step 900
900
#353E6A
oklch(37.8% 0.076 273.5)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#39437D 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) | #2A4A7F | 0.025 |
| Deuteranopia (no green cones) | #23457C | 0.027 |
| Tritanopia (no blue cones) | #1A505A | 0.087 |
| Achromatopsia (no color) | #474747 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39437D
#39437D
oklch(40.4% 0.098 273.9)
- #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 #39437D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Cobalt #1E488F ΔE 0.040
- Twilight Blue #0A437A ΔE 0.046
- Light Navy #155084 ΔE 0.046
- Blueberry #464196 ΔE 0.047
- Dusk Blue #26538D ΔE 0.050
- Twilight #4E518B ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.059
Use #39437D 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.