#3D4278
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.09 277.5), rgb(61, 66, 120).
Aa
White text reads best on this color (9.33:1).
About this color
#3D4278 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.090 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.040 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.24:1 |
| White text | 9.33:1 |
Values
| HEX | #3D4278 |
| RGB | rgb(61, 66, 120) |
| HSL | hsl(235, 33%, 35%) |
| OKLCH | oklch(40.2% 0.09 277.5) |
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 #3D4278 | 9.33:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #3D4278 | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #3D4278 text on white | 9.33:1 | AAA | Lc 91.4 | Preferred for body text |
| #3D4278 text on black | 2.24:1 | Fails | Lc -10.9 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B5BDED
oklch(80.9% 0.068 277.4)
-
Step 400
400
#909AE4
oklch(70.8% 0.109 277.3)
-
Step 500
500
#767FDC
oklch(63.1% 0.139 277.5)
-
Step 600
600
#6066C9
oklch(55.5% 0.151 277.7)
-
Step 700
700
#5055AE
oklch(49.2% 0.139 277.5)
-
Step 800
800
#41468D
oklch(42.8% 0.116 277.3)
-
Step 900
900 (this color)
#3D4278
oklch(40.2% 0.09 277.5)
-
Step 950
950
#202342
oklch(27% 0.057 277.6)
#3D4278 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) | #2D497A | 0.027 |
| Deuteranopia (no green cones) | #284477 | 0.028 |
| Tritanopia (no blue cones) | #284D57 | 0.078 |
| Achromatopsia (no color) | #474747 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D4278
#3D4278
oklch(40.2% 0.09 277.5)
- #554800
#554800
oklch(40.3% 0.083 97.3)
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 #3D4278, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.040
- Cobalt #1E488F ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
- Blueberry #464196 ΔE 0.053
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.057
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.061
Use #3D4278 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.