#3F668F
Closest named color: Denim (#3B638C). oklch(50% 0.079 250.8), rgb(63, 102, 143).
Aa
White text reads best on this color (5.98:1).
About this color
#3F668F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.079 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.011 away. White text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.50:1 |
| White text | 5.98:1 |
Values
| HEX | #3F668F |
| RGB | rgb(63, 102, 143) |
| HSL | hsl(211, 39%, 40%) |
| OKLCH | oklch(50% 0.079 250.8) |
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 #3F668F | 5.98:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #3F668F | 3.50:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #3F668F text on white | 5.98:1 | AA | Lc 79.8 | Fine for body text |
| #3F668F text on black | 3.50:1 | AA large text | Lc -22.0 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDAE7
oklch(88.4% 0.022 252.5)
-
Step 300
300
#AFC3D9
oklch(80.9% 0.038 250.8)
-
Step 400
400
#84A4C6
oklch(70.7% 0.061 250.2)
-
Step 500
500
#658DB8
oklch(63.1% 0.079 250.9)
-
Step 600
600
#4C77A4
oklch(55.7% 0.085 250.6)
-
Step 700
700 (this color)
#3F668F
oklch(50% 0.079 250.8)
-
Step 800
800
#325172
oklch(42.6% 0.066 251)
-
Step 900
900
#2C435C
oklch(37.5% 0.052 251.3)
-
Step 950
950
#1A2836
oklch(27.1% 0.032 249.1)
#3F668F 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) | #556891 | 0.029 |
| Deuteranopia (no green cones) | #4B608E | 0.021 |
| Tritanopia (no blue cones) | #0A6F74 | 0.069 |
| Achromatopsia (no color) | #636363 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F668F
#3F668F
oklch(50% 0.079 250.8)
- #805B2C
#805B2C
oklch(50% 0.08 70.7)
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 #3F668F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.011
- Dusky Blue #475F94 ΔE 0.025
- Denim Blue #3B5B92 ΔE 0.035
- Muted Blue #3B719F ΔE 0.036
- Peacock Blue #016795 ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.042
- Ocean Blue #03719C ΔE 0.043
- Metallic Blue #4F738E ΔE 0.046
Use #3F668F 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.