#3F609D
Closest named color: Dusky Blue (#475F94). oklch(49.4% 0.105 261.8), rgb(63, 96, 157).
Aa
White text reads best on this color (6.22:1).
About this color
#3F609D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.105 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.016 away. White text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #3F609D |
| RGB | rgb(63, 96, 157) |
| HSL | hsl(219, 43%, 43%) |
| OKLCH | oklch(49.4% 0.105 261.8) |
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 #3F609D | 6.22:1 | AA | Lc -86.0 | Fine for body text |
| Black text on #3F609D | 3.37:1 | AA large text | Lc 23.2 | Dividers and decoration only |
| #3F609D text on white | 6.22:1 | AA | Lc 80.9 | Fine for body text |
| #3F609D text on black | 3.37:1 | AA large text | Lc -21.0 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AFC1E2
oklch(80.8% 0.051 262.6)
-
Step 400
400
#85A1D4
oklch(70.7% 0.081 262.2)
-
Step 500
500
#6689C9
oklch(63.1% 0.105 261.9)
-
Step 600
600
#4D72B5
oklch(55.6% 0.113 261.5)
-
Step 700
700 (this color)
#3F609D
oklch(49.4% 0.105 261.8)
-
Step 800
800
#344E7F
oklch(42.8% 0.088 262.1)
-
Step 900
900
#2D4166
oklch(37.7% 0.069 262)
-
Step 950
950
#1B263C
oklch(27% 0.044 263.4)
#3F609D 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) | #46659F | 0.017 |
| Deuteranopia (no green cones) | #3A5D9C | 0.011 |
| Tritanopia (no blue cones) | #006E77 | 0.092 |
| Achromatopsia (no color) | #616161 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F609D
#3F609D
oklch(49.4% 0.105 261.8)
- #7E5A00
#7E5A00
oklch(49.3% 0.102 81.5)
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 #3F609D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.016
- Denim Blue #3B5B92 ΔE 0.022
- Denim #3B638C ΔE 0.032
- French Blue #436BAD ΔE 0.038
- Mid Blue #276AB3 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.042
- Peacock Blue #016795 ΔE 0.045
- Twilight #4E518B ΔE 0.047
Use #3F609D 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.