#3F6CC6
Closest named color: Windows Blue (#3778BF). oklch(54.6% 0.149 262.5), rgb(63, 108, 198).
Aa
White text reads best on this color (5.03:1).
About this color
#3F6CC6 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.149 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #3F6CC6 |
| RGB | rgb(63, 108, 198) |
| HSL | hsl(220, 54%, 51%) |
| OKLCH | oklch(54.6% 0.149 262.5) |
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 #3F6CC6 | 5.03:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #3F6CC6 | 4.17:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #3F6CC6 text on white | 5.03:1 | AA | Lc 74.5 | Content text, not long reading |
| #3F6CC6 text on black | 4.17:1 | AA large text | Lc -27.2 | 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 600.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#AAC1ED
oklch(80.9% 0.067 263.3)
-
Step 400
400
#7CA0E4
oklch(70.7% 0.108 262.5)
-
Step 500
500
#5B87DC
oklch(63.1% 0.137 262.4)
-
Step 600
600 (this color)
#3F6CC6
oklch(54.6% 0.149 262.5)
-
Step 700
700
#345CAE
oklch(49% 0.139 262.8)
-
Step 800
800
#2B4C8D
oklch(42.7% 0.115 262.4)
-
Step 900
900
#274071
oklch(37.8% 0.09 262.5)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#3F6CC6 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) | #3F76C9 | 0.027 |
| Deuteranopia (no green cones) | #2569C4 | 0.024 |
| Tritanopia (no blue cones) | #00818F | 0.121 |
| Achromatopsia (no color) | #6F6F6F | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6CC6
#3F6CC6
oklch(54.6% 0.149 262.5)
- #906900
#906900
oklch(54.6% 0.112 82.9)
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 #3F6CC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Mid Blue #276AB3 ΔE 0.038
- French Blue #436BAD ΔE 0.039
- Royal Blue #4169E1 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.058
- Iris #6258C4 ΔE 0.061
- Nice Blue #107AB0 ΔE 0.062
Use #3F6CC6 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.