#3966AF
Closest named color: Mid Blue (#276AB3). oklch(51.5% 0.126 259.6), rgb(57, 102, 175).
Aa
White text reads best on this color (5.68:1).
About this color
#3966AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.126 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.016 away. White text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #3966AF |
| RGB | rgb(57, 102, 175) |
| HSL | hsl(217, 51%, 45%) |
| OKLCH | oklch(51.5% 0.126 259.6) |
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 #3966AF | 5.68:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #3966AF | 3.69:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #3966AF text on white | 5.68:1 | AA | Lc 78.2 | Fine for body text |
| #3966AF text on black | 3.69:1 | AA large text | Lc -23.6 | 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
#AAC2E9
oklch(80.9% 0.061 260.1)
-
Step 400
400
#7CA2DE
oklch(70.8% 0.098 259.3)
-
Step 500
500
#5B89D4
oklch(63.1% 0.124 259.8)
-
Step 600
600
#4072C2
oklch(55.7% 0.136 259.4)
-
Step 700
700 (this color)
#3966AF
oklch(51.5% 0.126 259.6)
-
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)
#3966AF 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) | #446DB2 | 0.024 |
| Deuteranopia (no green cones) | #3262AE | 0.014 |
| Tritanopia (no blue cones) | #007782 | 0.103 |
| Achromatopsia (no color) | #676767 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3966AF
#3966AF
oklch(51.5% 0.126 259.6)
- #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 #3966AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.016
- French Blue #436BAD ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.045
- Muted Blue #3B719F ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.051
- Windows Blue #3778BF ΔE 0.052
- Ocean Blue #03719C ΔE 0.055
Use #3966AF 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.