#3B4181
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.106 276.5), rgb(59, 65, 129).
Aa
White text reads best on this color (9.29:1).
About this color
#3B4181 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.106 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.29:1 |
Values
| HEX | #3B4181 |
| RGB | rgb(59, 65, 129) |
| HSL | hsl(235, 37%, 37%) |
| OKLCH | oklch(40.4% 0.106 276.5) |
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 #3B4181 | 9.29:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3B4181 | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #3B4181 text on white | 9.29:1 | AAA | Lc 91.3 | Preferred for body text |
| #3B4181 text on black | 2.25:1 | Fails | Lc -11.1 | 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
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D3D8F0
oklch(88.6% 0.033 276.3)
-
Step 300
300
#B6BEE9
oklch(81% 0.061 276.7)
-
Step 400
400
#909BDE
oklch(70.7% 0.099 276.4)
-
Step 500
500
#7681D5
oklch(63.1% 0.126 276.5)
-
Step 600
600
#6069C2
oklch(55.6% 0.137 276.6)
-
Step 700
700
#4F57A8
oklch(49.1% 0.128 276.4)
-
Step 800
800 (this color)
#3B4181
oklch(40.4% 0.106 276.5)
-
Step 900
900
#373C6D
oklch(37.7% 0.083 277.2)
-
Step 950
950
#202440
oklch(27.1% 0.052 276.2)
#3B4181 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) | #244A83 | 0.034 |
| Deuteranopia (no green cones) | #1C4480 | 0.036 |
| Tritanopia (no blue cones) | #1C4F5B | 0.093 |
| Achromatopsia (no color) | #474747 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B4181
#3B4181
oklch(40.4% 0.106 276.5)
- #564800
#564800
oklch(40.4% 0.083 96.3)
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 #3B4181, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Blueberry #464196 ΔE 0.039
- Cobalt #1E488F ΔE 0.040
- Twilight Blue #0A437A ΔE 0.050
- Light Navy #155084 ΔE 0.052
- Dusk Blue #26538D ΔE 0.053
- Twilight #4E518B ΔE 0.057
- Dusk #4E5481 ΔE 0.065
Use #3B4181 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.