#3A407E
Closest named color: Dark Slate Blue (#483D8B). oklch(39.9% 0.103 276.5), rgb(58, 64, 126).
Aa
White text reads best on this color (9.48:1).
About this color
#3A407E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.103 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #3A407E |
| RGB | rgb(58, 64, 126) |
| HSL | hsl(235, 37%, 36%) |
| OKLCH | oklch(39.9% 0.103 276.5) |
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 #3A407E | 9.48:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3A407E | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #3A407E text on white | 9.48:1 | AAA | Lc 91.8 | Preferred for body text |
| #3A407E text on black | 2.21:1 | Fails | Lc -10.6 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF3
oklch(80.9% 0.077 276.4)
-
Step 400
400
#8D99ED
oklch(70.8% 0.123 276.6)
-
Step 500
500
#727DE7
oklch(63.1% 0.158 276.4)
-
Step 600
600
#5C63D5
oklch(55.5% 0.172 276.6)
-
Step 700
700
#4C52B9
oklch(49.2% 0.16 276.3)
-
Step 800
800
#3E4396
oklch(42.6% 0.134 276.5)
-
Step 900
900 (this color)
#3A407E
oklch(39.9% 0.103 276.5)
-
Step 950
950
#1F2246
oklch(27% 0.066 277.4)
#3A407E 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) | #244980 | 0.034 |
| Deuteranopia (no green cones) | #1D437D | 0.034 |
| Tritanopia (no blue cones) | #1C4E59 | 0.091 |
| Achromatopsia (no color) | #464646 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A407E
#3A407E
oklch(39.9% 0.103 276.5)
- #544700
#544700
oklch(39.9% 0.082 97.2)
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 #3A407E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Cobalt #1E488F ΔE 0.043
- Blueberry #464196 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.048
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.057
- Twilight #4E518B ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.066
Use #3A407E 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.