#3D3F80
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.107 279.1), rgb(61, 63, 128).
Aa
White text reads best on this color (9.45:1).
About this color
#3D3F80 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.107 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.026 away. White text reads best on it, at 9.45:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.22:1 |
| White text | 9.45:1 |
Values
| HEX | #3D3F80 |
| RGB | rgb(61, 63, 128) |
| HSL | hsl(238, 35%, 37%) |
| OKLCH | oklch(40.1% 0.107 279.1) |
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 #3D3F80 | 9.45:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3D3F80 | 2.22:1 | Fails | Lc 12.3 | Not readable |
| #3D3F80 text on white | 9.45:1 | AAA | Lc 91.7 | Preferred for body text |
| #3D3F80 text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F7
oklch(88.5% 0.044 278.4)
-
Step 300
300
#B5BCF4
oklch(80.9% 0.079 278.9)
-
Step 400
400
#9097EF
oklch(70.7% 0.128 279.1)
-
Step 500
500
#777AEA
oklch(63.1% 0.165 279.4)
-
Step 600
600
#6161D8
oklch(55.7% 0.178 278.9)
-
Step 700
700
#514FBB
oklch(49.1% 0.165 279.2)
-
Step 800
800
#424198
oklch(42.7% 0.139 279.3)
-
Step 900
900 (this color)
#3D3F80
oklch(40.1% 0.107 279.1)
-
Step 950
950
#202247
oklch(27.1% 0.068 278.5)
#3D3F80 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) | #214982 | 0.040 |
| Deuteranopia (no green cones) | #1B437F | 0.041 |
| Tritanopia (no blue cones) | #224D59 | 0.093 |
| Achromatopsia (no color) | #464646 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D3F80
#3D3F80
oklch(40.1% 0.107 279.1)
- #534800
#534800
oklch(40.1% 0.083 99.3)
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 #3D3F80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.026
- Blueberry #464196 ΔE 0.039
- Cobalt #1E488F ΔE 0.045
- Twilight Blue #0A437A ΔE 0.053
- Light Navy #155084 ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Twilight #4E518B ΔE 0.060
- Dusk #4E5481 ΔE 0.068
Use #3D3F80 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.