#3F6CB4
Closest named color: French Blue (#436BAD). oklch(53.5% 0.124 259.4), rgb(63, 108, 180).
Aa
White text reads best on this color (5.22:1).
About this color
#3F6CB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.124 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.011 away. White text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.01:1 |
| White text | 5.22:1 |
Values
| HEX | #3F6CB4 |
| RGB | rgb(63, 108, 180) |
| HSL | hsl(217, 48%, 48%) |
| OKLCH | oklch(53.5% 0.124 259.4) |
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 #3F6CB4 | 5.22:1 | AA | Lc -81.1 | Fine for body text |
| Black text on #3F6CB4 | 4.01:1 | AA large text | Lc 28.4 | Dividers and decoration only |
| #3F6CB4 text on white | 5.22:1 | AA | Lc 75.7 | Fine for body text |
| #3F6CB4 text on black | 4.01:1 | AA large text | Lc -26.0 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ACC2E5
oklch(80.9% 0.055 259.6)
-
Step 400
400
#7FA2D8
oklch(70.7% 0.089 258.9)
-
Step 500
500
#5F8ACE
oklch(63.2% 0.114 259.3)
-
Step 600
600 (this color)
#3F6CB4
oklch(53.5% 0.124 259.4)
-
Step 700
700
#3760A1
oklch(49.2% 0.114 259.3)
-
Step 800
800
#2E4E83
oklch(42.7% 0.096 260)
-
Step 900
900
#294169
oklch(37.6% 0.075 260.1)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#3F6CB4 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) | #4C72B7 | 0.023 |
| Deuteranopia (no green cones) | #3B67B3 | 0.015 |
| Tritanopia (no blue cones) | #007C87 | 0.102 |
| Achromatopsia (no color) | #6C6C6C | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6CB4
#3F6CB4
oklch(53.5% 0.124 259.4)
- #8F6400
#8F6400
oklch(53.4% 0.111 79.2)
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 #3F6CB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.011
- Mid Blue #276AB3 ΔE 0.022
- Flat Blue #3C73A8 ΔE 0.030
- Windows Blue #3778BF ΔE 0.034
- Muted Blue #3B719F ΔE 0.040
- Nice Blue #107AB0 ΔE 0.047
- Dull Blue #49759C ΔE 0.052
- Dusky Blue #475F94 ΔE 0.056
Use #3F6CB4 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.