#3F6DC7
Closest named color: Windows Blue (#3778BF). oklch(54.9% 0.149 262.3), rgb(63, 109, 199).
Aa
White text reads best on this color (4.97:1).
About this color
#3F6DC7 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.149 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.034 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #3F6DC7 |
| RGB | rgb(63, 109, 199) |
| HSL | hsl(220, 55%, 51%) |
| OKLCH | oklch(54.9% 0.149 262.3) |
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 #3F6DC7 | 4.97:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #3F6DC7 | 4.22:1 | AA large text | Lc 30.0 | Dividers and decoration only |
| #3F6DC7 text on white | 4.97:1 | AA | Lc 74.1 | Content text, not long reading |
| #3F6DC7 text on black | 4.22:1 | AA large text | Lc -27.6 | 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
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
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)
#3F6DC7
oklch(54.9% 0.149 262.3)
-
Step 700
700
#335DAE
oklch(49.2% 0.138 262)
-
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)
#3F6DC7 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) | #4076CA | 0.024 |
| Deuteranopia (no green cones) | #266AC5 | 0.023 |
| Tritanopia (no blue cones) | #008290 | 0.121 |
| Achromatopsia (no color) | #707070 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6DC7
#3F6DC7
oklch(54.9% 0.149 262.3)
- #926900
#926900
oklch(54.8% 0.113 81.6)
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 #3F6DC7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.034
- Mid Blue #276AB3 ΔE 0.039
- French Blue #436BAD ΔE 0.040
- Royal Blue #4169E1 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.059
- Nice Blue #107AB0 ΔE 0.061
- Iris #6258C4 ΔE 0.063
Use #3F6DC7 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.