#3A3C90
Closest named color: Dark Slate Blue (#483D8B). oklch(40.5% 0.136 277.4), rgb(58, 60, 144).
Aa
White text reads best on this color (9.42:1).
About this color
#3A3C90 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.136 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.024 away. White text reads best on it, at 9.42:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #3A3C90 |
| RGB | rgb(58, 60, 144) |
| HSL | hsl(239, 43%, 40%) |
| OKLCH | oklch(40.5% 0.136 277.4) |
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 #3A3C90 | 9.42:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #3A3C90 | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #3A3C90 text on white | 9.42:1 | AAA | Lc 91.4 | Preferred for body text |
| #3A3C90 text on black | 2.22:1 | Fails | Lc -10.9 | 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
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D1D7F7
oklch(88.5% 0.044 277.1)
-
Step 300
300
#B3BCF4
oklch(80.8% 0.08 277.4)
-
Step 400
400
#8E98EF
oklch(70.8% 0.127 277.6)
-
Step 500
500
#737CE9
oklch(63.1% 0.162 277.1)
-
Step 600
600
#5E62D7
oklch(55.6% 0.176 277.5)
-
Step 700
700
#4E50BB
oklch(49.1% 0.165 277.6)
-
Step 800
800 (this color)
#3A3C90
oklch(40.5% 0.136 277.4)
-
Step 900
900
#353978
oklch(37.6% 0.106 277.3)
-
Step 950
950
#1F2246
oklch(27% 0.066 277.4)
#3A3C90 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) | #004A93 | 0.054 |
| Deuteranopia (no green cones) | #00438E | 0.050 |
| Tritanopia (no blue cones) | #005060 | 0.118 |
| Achromatopsia (no color) | #464646 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3C90
#3A3C90
oklch(40.5% 0.136 277.4)
- #564900
#564900
oklch(40.6% 0.084 97.5)
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 #3A3C90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.024
- Blueberry #464196 ΔE 0.026
- Cobalt #1E488F ΔE 0.041
- Sapphire #2138AB ΔE 0.055
- Twilight Blue #0A437A ΔE 0.063
- Dusk Blue #26538D ΔE 0.064
- Light Navy #155084 ΔE 0.067
- Twilight #4E518B ΔE 0.069
Use #3A3C90 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.