#3A4188
Closest named color: Dark Slate Blue (#483D8B). oklch(40.9% 0.117 275.7), rgb(58, 65, 136).
Aa
White text reads best on this color (9.16:1).
About this color
#3A4188 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.117 and its hue 276°. 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 9.16:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.29:1 |
| White text | 9.16:1 |
Values
| HEX | #3A4188 |
| RGB | rgb(58, 65, 136) |
| HSL | hsl(235, 40%, 38%) |
| OKLCH | oklch(40.9% 0.117 275.7) |
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 #3A4188 | 9.16:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #3A4188 | 2.29:1 | Fails | Lc 13.1 | Not readable |
| #3A4188 text on white | 9.16:1 | AAA | Lc 90.9 | Preferred for body text |
| #3A4188 text on black | 2.29:1 | Fails | Lc -11.4 | 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
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F3
oklch(88.6% 0.038 275.7)
-
Step 300
300
#B4BEED
oklch(81% 0.067 275.4)
-
Step 400
400
#8E9AE5
oklch(70.7% 0.111 276.2)
-
Step 500
500
#7380DD
oklch(63.2% 0.14 275.6)
-
Step 600
600
#5D67CA
oklch(55.6% 0.152 276)
-
Step 700
700
#4D55AF
oklch(49.1% 0.141 276)
-
Step 800
800 (this color)
#3A4188
oklch(40.9% 0.117 275.7)
-
Step 900
900
#353C71
oklch(37.8% 0.09 275.5)
-
Step 950
950
#1F2342
oklch(26.9% 0.058 276.3)
#3A4188 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) | #1C4B8B | 0.039 |
| Deuteranopia (no green cones) | #0F4586 | 0.043 |
| Tritanopia (no blue cones) | #10515E | 0.103 |
| Achromatopsia (no color) | #484848 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4188
#3A4188
oklch(40.9% 0.117 275.7)
- #584900
#584900
oklch(40.9% 0.084 95.5)
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 #3A4188, 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 0.030
- Cobalt #1E488F ΔE 0.035
- Dusk Blue #26538D ΔE 0.051
- Light Navy #155084 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.053
- Twilight #4E518B ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.067
Use #3A4188 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.