#3D3F88
Closest named color: Dark Slate Blue (#483D8B). oklch(40.7% 0.119 278.5), rgb(61, 63, 136).
Aa
White text reads best on this color (9.27:1).
About this color
#3D3F88 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.119 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.019 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #3D3F88 |
| RGB | rgb(61, 63, 136) |
| HSL | hsl(238, 38%, 39%) |
| OKLCH | oklch(40.7% 0.119 278.5) |
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 #3D3F88 | 9.27:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #3D3F88 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #3D3F88 text on white | 9.27:1 | AAA | Lc 91.2 | Preferred for body text |
| #3D3F88 text on black | 2.26:1 | Fails | Lc -11.2 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B6BDEE
oklch(81% 0.07 278.4)
-
Step 400
400
#9199E5
oklch(70.7% 0.111 278.5)
-
Step 500
500
#777EDE
oklch(63.1% 0.143 278.3)
-
Step 600
600
#6165CB
oklch(55.5% 0.155 278.4)
-
Step 700
700
#5153B0
oklch(49% 0.145 278.7)
-
Step 800
800 (this color)
#3D3F88
oklch(40.7% 0.119 278.5)
-
Step 900
900
#373B72
oklch(37.8% 0.093 277.8)
-
Step 950
950
#202343
oklch(27.1% 0.059 277.6)
#3D3F88 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) | #184A8B | 0.046 |
| Deuteranopia (no green cones) | #0C4486 | 0.049 |
| Tritanopia (no blue cones) | #1B4F5D | 0.103 |
| Achromatopsia (no color) | #474747 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D3F88
#3D3F88
oklch(40.7% 0.119 278.5)
- #554900
#554900
oklch(40.5% 0.084 98.4)
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 #3D3F88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.019
- Blueberry #464196 ΔE 0.028
- Cobalt #1E488F ΔE 0.040
- Dusk Blue #26538D ΔE 0.057
- Twilight Blue #0A437A ΔE 0.058
- Twilight #4E518B ΔE 0.059
- Light Navy #155084 ΔE 0.059
- Dusk #4E5481 ΔE 0.071
Use #3D3F88 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.