#3F6DBE
Closest named color: French Blue (#436BAD). oklch(54.3% 0.137 260.9), rgb(63, 109, 190).
Aa
White text reads best on this color (5.06:1).
About this color
#3F6DBE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.137 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.026 away. White text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.14:1 |
| White text | 5.06:1 |
Values
| HEX | #3F6DBE |
| RGB | rgb(63, 109, 190) |
| HSL | hsl(218, 50%, 50%) |
| OKLCH | oklch(54.3% 0.137 260.9) |
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 #3F6DBE | 5.06:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #3F6DBE | 4.14:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #3F6DBE text on white | 5.06:1 | AA | Lc 74.7 | Content text, not long reading |
| #3F6DBE text on black | 4.14:1 | AA large text | Lc -27.0 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#AAC2E9
oklch(80.9% 0.061 260.1)
-
Step 400
400
#7DA1DE
oklch(70.6% 0.098 260.7)
-
Step 500
500
#5D89D5
oklch(63.2% 0.125 260.7)
-
Step 600
600 (this color)
#3F6DBE
oklch(54.3% 0.137 260.9)
-
Step 700
700
#345EA8
oklch(49% 0.128 260.8)
-
Step 800
800
#2C4D88
oklch(42.7% 0.106 261.1)
-
Step 900
900
#28416D
oklch(37.8% 0.082 261)
-
Step 950
950
#172640
oklch(27% 0.053 260.8)
#3F6DBE 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) | #4775C1 | 0.025 |
| Deuteranopia (no green cones) | #3269BC | 0.018 |
| Tritanopia (no blue cones) | #00808C | 0.112 |
| Achromatopsia (no color) | #6E6E6E | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6DBE
#3F6DBE
oklch(54.3% 0.137 260.9)
- #916700
#916700
oklch(54.3% 0.112 80.5)
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 #3F6DBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.026
- Mid Blue #276AB3 ΔE 0.029
- Windows Blue #3778BF ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.042
- Nice Blue #107AB0 ΔE 0.052
- Muted Blue #3B719F ΔE 0.053
- Royal Blue #4169E1 ΔE 0.056
- Dull Blue #49759C ΔE 0.064
Use #3F6DBE 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.