#3A5181
Closest named color: Dusk Blue (#26538D). oklch(43.9% 0.085 263.8), rgb(58, 81, 129).
Aa
White text reads best on this color (7.85:1).
About this color
#3A5181 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.085 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.027 away. White text reads best on it, at 7.85:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.67:1 |
| White text | 7.85:1 |
Values
| HEX | #3A5181 |
| RGB | rgb(58, 81, 129) |
| HSL | hsl(221, 38%, 37%) |
| OKLCH | oklch(43.9% 0.085 263.8) |
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 #3A5181 | 7.85:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #3A5181 | 2.67:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3A5181 text on white | 7.85:1 | AAA | Lc 87.1 | Fine for body text |
| #3A5181 text on black | 2.67:1 | Fails | Lc -15.0 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9EC
oklch(88.4% 0.028 265.4)
-
Step 300
300
#B0C1E1
oklch(80.9% 0.049 263.1)
-
Step 400
400
#87A1D3
oklch(70.8% 0.079 263.2)
-
Step 500
500
#6A88C7
oklch(63% 0.102 264.2)
-
Step 600
600
#5271B4
oklch(55.6% 0.111 264.3)
-
Step 700
700
#425F9A
oklch(49.1% 0.101 263.3)
-
Step 800
800 (this color)
#3A5181
oklch(43.9% 0.085 263.8)
-
Step 900
900
#2F4165
oklch(37.8% 0.066 263.3)
-
Step 950
950
#1C263B
oklch(27% 0.042 264.3)
#3A5181 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) | #3E5583 | 0.014 |
| Deuteranopia (no green cones) | #364F80 | 0.008 |
| Tritanopia (no blue cones) | #155B63 | 0.075 |
| Achromatopsia (no color) | #525252 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A5181
#3A5181
oklch(43.9% 0.085 263.8)
- #684E0D
#684E0D
oklch(44% 0.084 84.6)
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 #3A5181, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.028
- Dusk #4E5481 ΔE 0.030
- Twilight #4E518B ΔE 0.033
- Light Navy #155084 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.040
Use #3A5181 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.