#3A3E8F
Closest named color: Dark Slate Blue (#483D8B). oklch(40.8% 0.132 276.7), rgb(58, 62, 143).
Aa
White text reads best on this color (9.26:1).
About this color
#3A3E8F is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.132 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #3A3E8F |
| RGB | rgb(58, 62, 143) |
| HSL | hsl(237, 42%, 39%) |
| OKLCH | oklch(40.8% 0.132 276.7) |
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 #3A3E8F | 9.26:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #3A3E8F | 2.26:1 | Fails | Lc 12.9 | Not readable |
| #3A3E8F text on white | 9.26:1 | AAA | Lc 91.1 | Preferred for body text |
| #3A3E8F text on black | 2.26:1 | Fails | Lc -11.3 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF3
oklch(80.9% 0.077 276.4)
-
Step 400
400
#8D99ED
oklch(70.8% 0.123 276.6)
-
Step 500
500
#737DE7
oklch(63.2% 0.158 276.8)
-
Step 600
600
#5D64D5
oklch(55.7% 0.171 276.7)
-
Step 700
700
#4D52B8
oklch(49.1% 0.158 276.8)
-
Step 800
800 (this color)
#3A3E8F
oklch(40.8% 0.132 276.7)
-
Step 900
900
#353A77
oklch(37.8% 0.103 276.8)
-
Step 950
950
#1F2246
oklch(27% 0.066 277.4)
#3A3E8F 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) | #034B92 | 0.052 |
| Deuteranopia (no green cones) | #00448D | 0.049 |
| Tritanopia (no blue cones) | #015160 | 0.115 |
| Achromatopsia (no color) | #474747 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3E8F
#3A3E8F
oklch(40.8% 0.132 276.7)
- #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 #3A3E8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.024
- Cobalt #1E488F ΔE 0.038
- Sapphire #2138AB ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Twilight Blue #0A437A ΔE 0.061
- Light Navy #155084 ΔE 0.063
- Twilight #4E518B ΔE 0.065
Use #3A3E8F 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.