#3D66B0
Closest named color: French Blue (#436BAD). oklch(51.8% 0.126 261.3), rgb(61, 102, 176).
Aa
White text reads best on this color (5.63:1).
About this color
#3D66B0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.126 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.018 away. White text reads best on it, at 5.63:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.72:1 |
| White text | 5.63:1 |
Values
| HEX | #3D66B0 |
| RGB | rgb(61, 102, 176) |
| HSL | hsl(219, 49%, 46%) |
| OKLCH | oklch(51.8% 0.126 261.3) |
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 #3D66B0 | 5.63:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #3D66B0 | 3.72:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #3D66B0 text on white | 5.63:1 | AA | Lc 77.9 | Fine for body text |
| #3D66B0 text on black | 3.72:1 | AA large text | Lc -23.8 | 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
#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
#ABC2E9
oklch(81% 0.061 261)
-
Step 400
400
#7EA1DE
oklch(70.7% 0.098 261.2)
-
Step 500
500
#5E88D5
oklch(63.1% 0.126 261.7)
-
Step 600
600
#4471C2
oklch(55.7% 0.136 261.2)
-
Step 700
700 (this color)
#3D66B0
oklch(51.8% 0.126 261.3)
-
Step 800
800
#2D4D88
oklch(42.7% 0.105 261.6)
-
Step 900
900
#28416C
oklch(37.7% 0.08 260.6)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#3D66B0 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) | #446DB3 | 0.022 |
| Deuteranopia (no green cones) | #3362AE | 0.016 |
| Tritanopia (no blue cones) | #007782 | 0.105 |
| Achromatopsia (no color) | #676767 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D66B0
#3D66B0
oklch(51.8% 0.126 261.3)
- #876100
#876100
oklch(51.8% 0.107 81.8)
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 #3D66B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.018
- Mid Blue #276AB3 ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.045
- Muted Blue #3B719F ΔE 0.046
- Windows Blue #3778BF ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.053
- Denim #3B638C ΔE 0.057
Use #3D66B0 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.