#3966AB
Closest named color: Mid Blue (#276AB3). oklch(51.3% 0.121 258.7), rgb(57, 102, 171).
Aa
White text reads best on this color (5.73:1).
About this color
#3966AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.121 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.019 away. White text reads best on it, at 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #3966AB |
| RGB | rgb(57, 102, 171) |
| HSL | hsl(216, 50%, 45%) |
| OKLCH | oklch(51.3% 0.121 258.7) |
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 #3966AB | 5.73:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #3966AB | 3.66:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #3966AB text on white | 5.73:1 | AA | Lc 78.4 | Fine for body text |
| #3966AB text on black | 3.66:1 | AA large text | Lc -23.4 | 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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#AAC2E7
oklch(80.9% 0.059 259)
-
Step 400
400
#7DA2DB
oklch(70.7% 0.093 258.8)
-
Step 500
500
#5B8AD1
oklch(63.1% 0.119 258.4)
-
Step 600
600
#4172BE
oklch(55.5% 0.13 258.9)
-
Step 700
700 (this color)
#3966AB
oklch(51.3% 0.121 258.7)
-
Step 800
800
#2B4E85
oklch(42.6% 0.1 259.1)
-
Step 900
900
#27416A
oklch(37.6% 0.078 259.2)
-
Step 950
950
#17273E
oklch(27.1% 0.048 257.5)
#3966AB 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) | #476CAE | 0.024 |
| Deuteranopia (no green cones) | #3661AA | 0.015 |
| Tritanopia (no blue cones) | #007680 | 0.099 |
| Achromatopsia (no color) | #666666 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3966AB
#3966AB
oklch(51.3% 0.121 258.7)
- #875E00
#875E00
oklch(51.2% 0.106 79)
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 #3966AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.019
- French Blue #436BAD ΔE 0.019
- Dusky Blue #475F94 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.039
- Muted Blue #3B719F ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.046
- Denim #3B638C ΔE 0.049
- Peacock Blue #016795 ΔE 0.050
Use #3966AB 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.