#3661A4
Closest named color: Dusky Blue (#475F94). oklch(49.6% 0.118 259), rgb(54, 97, 164).
Aa
White text reads best on this color (6.17:1).
About this color
#3661A4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.118 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.030 away. White text reads best on it, at 6.17:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.40:1 |
| White text | 6.17:1 |
Values
| HEX | #3661A4 |
| RGB | rgb(54, 97, 164) |
| HSL | hsl(217, 50%, 43%) |
| OKLCH | oklch(49.6% 0.118 259) |
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 #3661A4 | 6.17:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #3661A4 | 3.40:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #3661A4 text on white | 6.17:1 | AA | Lc 80.5 | Fine for body text |
| #3661A4 text on black | 3.40:1 | AA large text | Lc -21.3 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#ABC2E6
oklch(80.9% 0.057 259.3)
-
Step 400
400
#7EA2DA
oklch(70.7% 0.092 259)
-
Step 500
500
#5D8ACF
oklch(63.1% 0.116 258.7)
-
Step 600
600
#4372BC
oklch(55.5% 0.127 259.1)
-
Step 700
700 (this color)
#3661A4
oklch(49.6% 0.118 259)
-
Step 800
800
#2C4E84
oklch(42.6% 0.099 259.3)
-
Step 900
900
#28416A
oklch(37.6% 0.077 259.8)
-
Step 950
950
#18273E
oklch(27.2% 0.048 258.7)
#3661A4 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) | #4367A7 | 0.024 |
| Deuteranopia (no green cones) | #325DA3 | 0.013 |
| Tritanopia (no blue cones) | #00707A | 0.096 |
| Achromatopsia (no color) | #616161 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3661A4
#3661A4
oklch(49.6% 0.118 259)
- #815A00
#815A00
oklch(49.6% 0.103 79.3)
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 #3661A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.030
- Denim Blue #3B5B92 ΔE 0.031
- Mid Blue #276AB3 ΔE 0.031
- French Blue #436BAD ΔE 0.035
- Denim #3B638C ΔE 0.041
- Peacock Blue #016795 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.048
- Muted Blue #3B719F ΔE 0.050
Use #3661A4 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.