#3A3F8B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.7% 0.124 276.5), rgb(58, 63, 139).
Aa
White text reads best on this color (9.27:1).
About this color
#3A3F8B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.124 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.022 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #3A3F8B |
| RGB | rgb(58, 63, 139) |
| HSL | hsl(236, 41%, 39%) |
| OKLCH | oklch(40.7% 0.124 276.5) |
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 #3A3F8B | 9.27:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #3A3F8B | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #3A3F8B text on white | 9.27:1 | AAA | Lc 91.1 | Preferred for body text |
| #3A3F8B 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D2D7F4
oklch(88.4% 0.04 277.8)
-
Step 300
300
#B4BDF0
oklch(80.9% 0.073 276.8)
-
Step 400
400
#8E99E9
oklch(70.7% 0.117 277)
-
Step 500
500
#737EE2
oklch(63.1% 0.149 276.5)
-
Step 600
600
#5D65CF
oklch(55.5% 0.161 276.5)
-
Step 700
700
#4D53B4
oklch(49% 0.151 276.6)
-
Step 800
800 (this color)
#3A3F8B
oklch(40.7% 0.124 276.5)
-
Step 900
900
#353B74
oklch(37.8% 0.096 276.2)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#3A3F8B 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) | #124B8E | 0.046 |
| Deuteranopia (no green cones) | #004489 | 0.050 |
| Tritanopia (no blue cones) | #0A505E | 0.109 |
| Achromatopsia (no color) | #474747 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3F8B
#3A3F8B
oklch(40.7% 0.124 276.5)
- #574900
#574900
oklch(40.8% 0.084 96.5)
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 #3A3F8B, 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 0.027
- Cobalt #1E488F ΔE 0.036
- Dusk Blue #26538D ΔE 0.056
- Twilight Blue #0A437A ΔE 0.057
- Light Navy #155084 ΔE 0.059
- Twilight #4E518B ΔE 0.062
- Sapphire #2138AB ΔE 0.064
Use #3A3F8B 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.