#3F6EC4
Closest named color: Windows Blue (#3778BF). oklch(54.9% 0.144 261.4), rgb(63, 110, 196).
Aa
White text reads best on this color (4.95:1).
About this color
#3F6EC4 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.144 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.030 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.23:1 |
| White text | 4.95:1 |
Values
| HEX | #3F6EC4 |
| RGB | rgb(63, 110, 196) |
| HSL | hsl(219, 53%, 51%) |
| OKLCH | oklch(54.9% 0.144 261.4) |
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 #3F6EC4 | 4.95:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #3F6EC4 | 4.23:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #3F6EC4 text on white | 4.95:1 | AA | Lc 74.0 | Content text, not long reading |
| #3F6EC4 text on black | 4.23:1 | AA large text | Lc -27.7 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#AAC2EB
oklch(81% 0.064 261.1)
-
Step 400
400
#7CA1E1
oklch(70.7% 0.103 261)
-
Step 500
500
#5B88D9
oklch(63.1% 0.132 261.4)
-
Step 600
600 (this color)
#3F6EC4
oklch(54.9% 0.144 261.4)
-
Step 700
700
#335DAB
oklch(49% 0.134 261.5)
-
Step 800
800
#2B4D8B
oklch(42.8% 0.11 261.3)
-
Step 900
900
#27406F
oklch(37.6% 0.087 261.9)
-
Step 950
950
#172641
oklch(27% 0.055 261.4)
#3F6EC4 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) | #4477C7 | 0.026 |
| Deuteranopia (no green cones) | #2D6AC2 | 0.021 |
| Tritanopia (no blue cones) | #00828F | 0.117 |
| Achromatopsia (no color) | #707070 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6EC4
#3F6EC4
oklch(54.9% 0.144 261.4)
- #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 #3F6EC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.030
- French Blue #436BAD ΔE 0.036
- Mid Blue #276AB3 ΔE 0.036
- Royal Blue #4169E1 ΔE 0.048
- Flat Blue #3C73A8 ΔE 0.049
- Nice Blue #107AB0 ΔE 0.056
- Muted Blue #3B719F ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.062
Use #3F6EC4 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.