#3B3D88
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.123 278.2), rgb(59, 61, 136).
Aa
White text reads best on this color (9.50:1).
About this color
#3B3D88 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.123 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.022 away. White text reads best on it, at 9.50:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.20:1 |
| White text | 9.50:1 |
Values
| HEX | #3B3D88 |
| RGB | rgb(59, 61, 136) |
| HSL | hsl(238, 39%, 38%) |
| OKLCH | oklch(40.1% 0.123 278.2) |
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 #3B3D88 | 9.50:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3B3D88 | 2.20:1 | Fails | Lc 12.2 | Not readable |
| #3B3D88 text on white | 9.50:1 | AAA | Lc 91.7 | Preferred for body text |
| #3B3D88 text on black | 2.20:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D1D7FB
oklch(88.6% 0.05 277.9)
-
Step 300
300
#B2BBFC
oklch(80.8% 0.092 278)
-
Step 400
400
#8C95FA
oklch(70.6% 0.147 278.1)
-
Step 500
500
#7377F7
oklch(63.1% 0.187 278.2)
-
Step 600
600
#5E5CE6
oklch(55.6% 0.203 278.1)
-
Step 700
700
#4E4AC8
oklch(49.1% 0.19 278.2)
-
Step 800
800
#403EA2
oklch(42.8% 0.157 278.3)
-
Step 900
900 (this color)
#3B3D88
oklch(40.1% 0.123 278.2)
-
Step 950
950
#1F204B
oklch(26.9% 0.078 278.8)
#3B3D88 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) | #10498B | 0.049 |
| Deuteranopia (no green cones) | #004386 | 0.052 |
| Tritanopia (no blue cones) | #154E5C | 0.107 |
| Achromatopsia (no color) | #464646 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B3D88
#3B3D88
oklch(40.1% 0.123 278.2)
- #544800
#544800
oklch(40.2% 0.083 98.3)
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 #3B3D88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.022
- Blueberry #464196 ΔE 0.031
- Cobalt #1E488F ΔE 0.041
- Twilight Blue #0A437A ΔE 0.056
- Dusk Blue #26538D ΔE 0.062
- Light Navy #155084 ΔE 0.062
- Twilight #4E518B ΔE 0.065
- Sapphire #2138AB ΔE 0.068
Use #3B3D88 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.