#3F609B
Closest named color: Dusky Blue (#475F94). oklch(49.2% 0.103 261.3), rgb(63, 96, 155).
Aa
White text reads best on this color (6.25:1).
About this color
#3F609B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.103 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.014 away. White text reads best on it, at 6.25:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.35:1 |
| White text | 6.25:1 |
Values
| HEX | #3F609B |
| RGB | rgb(63, 96, 155) |
| HSL | hsl(218, 42%, 43%) |
| OKLCH | oklch(49.2% 0.103 261.3) |
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 #3F609B | 6.25:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #3F609B | 3.35:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #3F609B text on white | 6.25:1 | AA | Lc 81.0 | Fine for body text |
| #3F609B text on black | 3.35:1 | AA large text | Lc -20.9 | 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
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AFC2E1
oklch(81% 0.049 260.2)
-
Step 400
400
#85A1D3
oklch(70.7% 0.08 261.8)
-
Step 500
500
#6689C7
oklch(63% 0.102 261.4)
-
Step 600
600
#4E72B4
oklch(55.6% 0.111 261.7)
-
Step 700
700 (this color)
#3F609B
oklch(49.2% 0.103 261.3)
-
Step 800
800
#344E7D
oklch(42.6% 0.085 261.5)
-
Step 900
900
#2D4165
oklch(37.6% 0.067 261.5)
-
Step 950
950
#1B263B
oklch(26.9% 0.042 262.7)
#3F609B 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) | #47659D | 0.018 |
| Deuteranopia (no green cones) | #3B5C9A | 0.013 |
| Tritanopia (no blue cones) | #006D76 | 0.090 |
| Achromatopsia (no color) | #606060 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F609B
#3F609B
oklch(49.2% 0.103 261.3)
- #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 #3F609B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.014
- Denim Blue #3B5B92 ΔE 0.020
- Denim #3B638C ΔE 0.028
- French Blue #436BAD ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.040
- Peacock Blue #016795 ΔE 0.043
- Mid Blue #276AB3 ΔE 0.044
- Twilight #4E518B ΔE 0.046
Use #3F609B 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.