#3A427D
Closest named color: Dark Slate Blue (#483D8B). oklch(40.3% 0.099 275.2), rgb(58, 66, 125).
Aa
White text reads best on this color (9.31:1).
About this color
#3A427D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.099 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 9.31:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.31:1 |
Values
| HEX | #3A427D |
| RGB | rgb(58, 66, 125) |
| HSL | hsl(233, 37%, 36%) |
| OKLCH | oklch(40.3% 0.099 275.2) |
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 #3A427D | 9.31:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #3A427D | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #3A427D text on white | 9.31:1 | AAA | Lc 91.3 | Preferred for body text |
| #3A427D text on black | 2.25:1 | Fails | Lc -11.0 | 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
#D3D8EF
oklch(88.5% 0.032 276)
-
Step 300
300
#B5BEE7
oklch(80.8% 0.059 275.3)
-
Step 400
400
#909CDA
oklch(70.7% 0.092 275.4)
-
Step 500
500
#7582D0
oklch(63% 0.118 275.3)
-
Step 600
600
#5F6BBD
oklch(55.7% 0.127 275.2)
-
Step 700
700
#4E59A3
oklch(49.1% 0.118 274.8)
-
Step 800
800 (this color)
#3A427D
oklch(40.3% 0.099 275.2)
-
Step 900
900
#363D6A
oklch(37.6% 0.077 275.4)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#3A427D 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) | #294A7F | 0.028 |
| Deuteranopia (no green cones) | #22447C | 0.029 |
| Tritanopia (no blue cones) | #1D4F59 | 0.088 |
| Achromatopsia (no color) | #474747 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A427D
#3A427D
oklch(40.3% 0.099 275.2)
- #564700
#564700
oklch(40.2% 0.082 95.2)
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 #3A427D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Cobalt #1E488F ΔE 0.042
- Blueberry #464196 ΔE 0.046
- Twilight Blue #0A437A ΔE 0.047
- Light Navy #155084 ΔE 0.049
- Dusk Blue #26538D ΔE 0.052
- Twilight #4E518B ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.062
Use #3A427D 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.