#3F6BB0
Closest named color: French Blue (#436BAD). oklch(53% 0.12 259.1), rgb(63, 107, 176).
Aa
White text reads best on this color (5.32:1).
About this color
#3F6BB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.120 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.006 away. White text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.94:1 |
| White text | 5.32:1 |
Values
| HEX | #3F6BB0 |
| RGB | rgb(63, 107, 176) |
| HSL | hsl(217, 47%, 47%) |
| OKLCH | oklch(53% 0.12 259.1) |
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 #3F6BB0 | 5.32:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #3F6BB0 | 3.94:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #3F6BB0 text on white | 5.32:1 | AA | Lc 76.3 | Fine for body text |
| #3F6BB0 text on black | 3.94:1 | AA large text | Lc -25.4 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#80A2D6
oklch(70.7% 0.085 258.7)
-
Step 500
500
#608ACC
oklch(63.1% 0.11 259.1)
-
Step 600
600 (this color)
#3F6BB0
oklch(53% 0.12 259.1)
-
Step 700
700
#38609F
oklch(49.1% 0.111 259.1)
-
Step 800
800
#2F4F81
oklch(42.8% 0.092 259)
-
Step 900
900
#2A4267
oklch(37.8% 0.07 258.8)
-
Step 950
950
#19273D
oklch(27.2% 0.046 259.2)
#3F6BB0 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) | #4D71B3 | 0.024 |
| Deuteranopia (no green cones) | #3C66AF | 0.015 |
| Tritanopia (no blue cones) | #007B85 | 0.099 |
| Achromatopsia (no color) | #6B6B6B | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6BB0
#3F6BB0
oklch(53% 0.12 259.1)
- #8D6300
#8D6300
oklch(53% 0.11 79.6)
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 #3F6BB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.006
- Mid Blue #276AB3 ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.028
- Muted Blue #3B719F ΔE 0.036
- Windows Blue #3778BF ΔE 0.039
- Nice Blue #107AB0 ΔE 0.047
- Dull Blue #49759C ΔE 0.049
- Dusky Blue #475F94 ΔE 0.050
Use #3F6BB0 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.