#3F5F99
Closest named color: Dusky Blue (#475F94). oklch(48.9% 0.101 261.5), rgb(63, 95, 153).
Aa
White text reads best on this color (6.34:1).
About this color
#3F5F99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.101 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.012 away. White text reads best on it, at 6.34:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.30:1 |
| White text | 6.34:1 |
Values
| HEX | #3F5F99 |
| RGB | rgb(63, 95, 153) |
| HSL | hsl(219, 42%, 42%) |
| OKLCH | oklch(48.9% 0.101 261.5) |
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 #3F5F99 | 6.34:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #3F5F99 | 3.30:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #3F5F99 text on white | 6.34:1 | AA | Lc 81.4 | Fine for body text |
| #3F5F99 text on black | 3.30:1 | AA large text | Lc -20.5 | 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
#AFC1E1
oklch(80.8% 0.05 262)
-
Step 400
400
#86A1D2
oklch(70.7% 0.078 262.1)
-
Step 500
500
#6789C6
oklch(63% 0.1 261.6)
-
Step 600
600
#4F72B3
oklch(55.6% 0.109 262)
-
Step 700
700 (this color)
#3F5F99
oklch(48.9% 0.101 261.5)
-
Step 800
800
#354E7D
oklch(42.7% 0.084 262.2)
-
Step 900
900
#2E4164
oklch(37.6% 0.065 262)
-
Step 950
950
#1B263B
oklch(26.9% 0.042 262.7)
#3F5F99 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) | #47649B | 0.018 |
| Deuteranopia (no green cones) | #3B5C98 | 0.010 |
| Tritanopia (no blue cones) | #006C74 | 0.090 |
| Achromatopsia (no color) | #5F5F5F | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5F99
#3F5F99
oklch(48.9% 0.101 261.5)
- #7D5900
#7D5900
oklch(48.9% 0.101 81.2)
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 #3F5F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.012
- Denim Blue #3B5B92 ΔE 0.016
- Denim #3B638C ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.036
- Twilight #4E518B ΔE 0.043
- Peacock Blue #016795 ΔE 0.043
- French Blue #436BAD ΔE 0.043
- Dusk #4E5481 ΔE 0.046
Use #3F5F99 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.