#3F63A7
Closest named color: French Blue (#436BAD). oklch(50.6% 0.116 262), rgb(63, 99, 167).
Aa
White text reads best on this color (5.90:1).
About this color
#3F63A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.116 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.024 away. White text reads best on it, at 5.90:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.55:1 |
| White text | 5.90:1 |
Values
| HEX | #3F63A7 |
| RGB | rgb(63, 99, 167) |
| HSL | hsl(219, 45%, 45%) |
| OKLCH | oklch(50.6% 0.116 262) |
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 #3F63A7 | 5.90:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #3F63A7 | 3.55:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #3F63A7 text on white | 5.90:1 | AA | Lc 79.3 | Fine for body text |
| #3F63A7 text on black | 3.55:1 | AA large text | Lc -22.5 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ADC1E6
oklch(80.8% 0.057 262.7)
-
Step 400
400
#82A1D9
oklch(70.7% 0.09 261.9)
-
Step 500
500
#6389CF
oklch(63.2% 0.114 261.9)
-
Step 600
600
#4A71BC
oklch(55.6% 0.125 262.3)
-
Step 700
700 (this color)
#3F63A7
oklch(50.6% 0.116 262)
-
Step 800
800
#314D83
oklch(42.6% 0.096 262.4)
-
Step 900
900
#2B4169
oklch(37.7% 0.074 261.6)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#3F63A7 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) | #4569AA | 0.019 |
| Deuteranopia (no green cones) | #3760A6 | 0.013 |
| Tritanopia (no blue cones) | #00727D | 0.098 |
| Achromatopsia (no color) | #646464 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F63A7
#3F63A7
oklch(50.6% 0.116 262)
- #825E00
#825E00
oklch(50.6% 0.104 82.4)
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 #3F63A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.024
- Mid Blue #276AB3 ΔE 0.029
- Dusky Blue #475F94 ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.038
- Denim #3B638C ΔE 0.045
- Muted Blue #3B719F ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.045
- Peacock Blue #016795 ΔE 0.051
Use #3F63A7 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.