#3F6CC4
Closest named color: Windows Blue (#3778BF). oklch(54.5% 0.146 262.3), rgb(63, 108, 196).
Aa
White text reads best on this color (5.05:1).
About this color
#3F6CC4 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.146 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.035 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #3F6CC4 |
| RGB | rgb(63, 108, 196) |
| HSL | hsl(220, 53%, 51%) |
| OKLCH | oklch(54.5% 0.146 262.3) |
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 #3F6CC4 | 5.05:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #3F6CC4 | 4.15:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #3F6CC4 text on white | 5.05:1 | AA | Lc 74.6 | Content text, not long reading |
| #3F6CC4 text on black | 4.15:1 | AA large text | Lc -27.1 | 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
#AAC1EC
oklch(80.8% 0.066 262.8)
-
Step 400
400
#7DA0E2
oklch(70.6% 0.105 262.6)
-
Step 500
500
#5C87DA
oklch(63% 0.134 262.5)
-
Step 600
600 (this color)
#3F6CC4
oklch(54.5% 0.146 262.3)
-
Step 700
700
#345DAD
oklch(49.2% 0.136 262.2)
-
Step 800
800
#2C4C8C
oklch(42.7% 0.113 262.6)
-
Step 900
900
#274070
oklch(37.7% 0.088 262.2)
-
Step 950
950
#172641
oklch(27% 0.055 261.4)
#3F6CC4 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) | #4175C7 | 0.025 |
| Deuteranopia (no green cones) | #2869C2 | 0.022 |
| Tritanopia (no blue cones) | #00808E | 0.119 |
| Achromatopsia (no color) | #6F6F6F | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6CC4
#3F6CC4
oklch(54.5% 0.146 262.3)
- #906800
#906800
oklch(54.4% 0.112 82)
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 #3F6CC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.035
- Mid Blue #276AB3 ΔE 0.035
- French Blue #436BAD ΔE 0.036
- Royal Blue #4169E1 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.052
- Nice Blue #107AB0 ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.060
- Iris #6258C4 ΔE 0.062
Use #3F6CC4 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.