#3A4687
Closest named color: Dark Slate Blue (#483D8B). oklch(41.9% 0.108 273), rgb(58, 70, 135).
Aa
White text reads best on this color (8.72:1).
About this color
#3A4687 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.108 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.031 away. White text reads best on it, at 8.72:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.40:1 |
| White text | 8.72:1 |
Values
| HEX | #3A4687 |
| RGB | rgb(58, 70, 135) |
| HSL | hsl(231, 40%, 38%) |
| OKLCH | oklch(41.9% 0.108 273) |
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 #3A4687 | 8.72:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #3A4687 | 2.40:1 | Fails | Lc 14.3 | Not readable |
| #3A4687 text on white | 8.72:1 | AAA | Lc 89.7 | Fine for body text |
| #3A4687 text on black | 2.40:1 | Fails | Lc -12.5 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B3BFEA
oklch(81% 0.062 272.7)
-
Step 400
400
#8C9CE0
oklch(70.7% 0.101 273.4)
-
Step 500
500
#7082D7
oklch(63% 0.129 273.1)
-
Step 600
600
#596AC5
oklch(55.6% 0.142 273)
-
Step 700
700
#4958AA
oklch(49.1% 0.131 272.9)
-
Step 800
800 (this color)
#3A4687
oklch(41.9% 0.108 273)
-
Step 900
900
#333D6E
oklch(37.7% 0.085 273)
-
Step 950
950
#1E2440
oklch(27% 0.053 273.2)
#3A4687 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) | #284E89 | 0.028 |
| Deuteranopia (no green cones) | #1E4886 | 0.031 |
| Tritanopia (no blue cones) | #105460 | 0.095 |
| Achromatopsia (no color) | #4B4B4B | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4687
#3A4687
oklch(41.9% 0.108 273)
- #5D4B00
#5D4B00
oklch(41.9% 0.086 93)
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 #3A4687, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.031
- Cobalt #1E488F ΔE 0.032
- Blueberry #464196 ΔE 0.034
- Dusk Blue #26538D ΔE 0.039
- Light Navy #155084 ΔE 0.043
- Twilight #4E518B ΔE 0.045
- Twilight Blue #0A437A ΔE 0.053
- Dusk #4E5481 ΔE 0.055
Use #3A4687 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.