#3966AE
Closest named color: Mid Blue (#276AB3). oklch(51.5% 0.125 259.4), rgb(57, 102, 174).
Aa
White text reads best on this color (5.69:1).
About this color
#3966AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.125 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.017 away. White text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #3966AE |
| RGB | rgb(57, 102, 174) |
| HSL | hsl(217, 51%, 45%) |
| OKLCH | oklch(51.5% 0.125 259.4) |
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 #3966AE | 5.69:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #3966AE | 3.68:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #3966AE text on white | 5.69:1 | AA | Lc 78.2 | Fine for body text |
| #3966AE text on black | 3.68:1 | AA large text | Lc -23.5 | 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
#CCDAF0
oklch(88.5% 0.034 259.4)
-
Step 300
300
#AAC2E8
oklch(80.9% 0.06 259.5)
-
Step 400
400
#7CA2DD
oklch(70.8% 0.097 259)
-
Step 500
500
#5B89D4
oklch(63.1% 0.124 259.8)
-
Step 600
600
#4172C1
oklch(55.7% 0.134 259.5)
-
Step 700
700 (this color)
#3966AE
oklch(51.5% 0.125 259.4)
-
Step 800
800
#2A4E87
oklch(42.7% 0.104 259.2)
-
Step 900
900
#26416C
oklch(37.6% 0.081 259.3)
-
Step 950
950
#17263F
oklch(26.9% 0.051 260.2)
#3966AE 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) | #456CB1 | 0.023 |
| Deuteranopia (no green cones) | #3362AD | 0.013 |
| Tritanopia (no blue cones) | #007781 | 0.103 |
| Achromatopsia (no color) | #676767 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3966AE
#3966AE
oklch(51.5% 0.125 259.4)
- #885F00
#885F00
oklch(51.5% 0.107 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 #3966AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.017
- French Blue #436BAD ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.041
- Dusky Blue #475F94 ΔE 0.043
- Muted Blue #3B719F ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.050
- Windows Blue #3778BF ΔE 0.053
- Peacock Blue #016795 ΔE 0.054
Use #3966AE 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.