#39428B
Closest named color: Dark Slate Blue (#483D8B). oklch(41.2% 0.12 274.6), rgb(57, 66, 139).
Aa
White text reads best on this color (9.02:1).
About this color
#39428B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.120 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.025 away. White text reads best on it, at 9.02:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #39428B |
| RGB | rgb(57, 66, 139) |
| HSL | hsl(233, 42%, 38%) |
| OKLCH | oklch(41.2% 0.12 274.6) |
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 #39428B | 9.02:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #39428B | 2.32:1 | Fails | Lc 13.5 | Not readable |
| #39428B text on white | 9.02:1 | AAA | Lc 90.5 | Preferred for body text |
| #39428B text on black | 2.32:1 | Fails | Lc -11.8 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B2BEEF
oklch(80.9% 0.071 274)
-
Step 400
400
#8C9BE7
oklch(70.8% 0.113 274.6)
-
Step 500
500
#7080DF
oklch(63.1% 0.143 274.4)
-
Step 600
600
#5A67CD
oklch(55.6% 0.157 274.7)
-
Step 700
700
#4A55B1
oklch(49% 0.145 274.6)
-
Step 800
800 (this color)
#39428B
oklch(41.2% 0.12 274.6)
-
Step 900
900
#333C73
oklch(37.8% 0.094 274)
-
Step 950
950
#1E2343
oklch(26.9% 0.06 275)
#39428B 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) | #1B4C8E | 0.038 |
| Deuteranopia (no green cones) | #0A4589 | 0.043 |
| Tritanopia (no blue cones) | #035360 | 0.107 |
| Achromatopsia (no color) | #494949 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39428B
#39428B
oklch(41.2% 0.12 274.6)
- #5A4A00
#5A4A00
oklch(41.3% 0.085 94.7)
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 #39428B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.025
- Blueberry #464196 ΔE 0.027
- Cobalt #1E488F ΔE 0.031
- Dusk Blue #26538D ΔE 0.049
- Light Navy #155084 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.055
- Twilight #4E518B ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.066
Use #39428B 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.