#3F6FB7
Closest named color: French Blue (#436BAD). oklch(54.3% 0.125 258.3), rgb(63, 111, 183).
Aa
White text reads best on this color (5.03:1).
About this color
#3F6FB7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.125 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.017 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.16:1 |
| White text | 5.03:1 |
Values
| HEX | #3F6FB7 |
| RGB | rgb(63, 111, 183) |
| HSL | hsl(216, 49%, 48%) |
| OKLCH | oklch(54.3% 0.125 258.3) |
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 #3F6FB7 | 5.03:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #3F6FB7 | 4.16:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #3F6FB7 text on white | 5.03:1 | AA | Lc 74.6 | Content text, not long reading |
| #3F6FB7 text on black | 4.16:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E5
oklch(80.9% 0.056 258.7)
-
Step 400
400
#7EA2D9
oklch(70.7% 0.09 258.7)
-
Step 500
500
#5D8ACE
oklch(63.1% 0.114 258.4)
-
Step 600
600 (this color)
#3F6FB7
oklch(54.3% 0.125 258.3)
-
Step 700
700
#3460A1
oklch(49% 0.116 258.1)
-
Step 800
800
#2C4F83
oklch(42.8% 0.096 258.2)
-
Step 900
900
#284269
oklch(37.8% 0.074 258.3)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#3F6FB7 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) | #4F75BA | 0.026 |
| Deuteranopia (no green cones) | #3D6AB6 | 0.014 |
| Tritanopia (no blue cones) | #007F8A | 0.101 |
| Achromatopsia (no color) | #6F6F6F | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6FB7
#3F6FB7
oklch(54.3% 0.125 258.3)
- #936600
#936600
oklch(54.3% 0.113 78.4)
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 #3F6FB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.017
- Windows Blue #3778BF ΔE 0.025
- Mid Blue #276AB3 ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.029
- Muted Blue #3B719F ΔE 0.040
- Nice Blue #107AB0 ΔE 0.042
- Dull Blue #49759C ΔE 0.051
- Steel Blue #4682B4 ΔE 0.057
Use #3F6FB7 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.