#3A66AC
Closest named color: French Blue (#436BAD). oklch(51.4% 0.122 259.3), rgb(58, 102, 172).
Aa
White text reads best on this color (5.71:1).
About this color
#3A66AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.122 and its hue 259°. 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 5.71:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.67:1 |
| White text | 5.71:1 |
Values
| HEX | #3A66AC |
| RGB | rgb(58, 102, 172) |
| HSL | hsl(217, 50%, 45%) |
| OKLCH | oklch(51.4% 0.122 259.3) |
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 #3A66AC | 5.71:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #3A66AC | 3.67:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #3A66AC text on white | 5.71:1 | AA | Lc 78.3 | Fine for body text |
| #3A66AC text on black | 3.67:1 | 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
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#AAC2E7
oklch(80.9% 0.059 259)
-
Step 400
400
#7DA2DB
oklch(70.7% 0.093 258.8)
-
Step 500
500
#5C89D2
oklch(63% 0.121 259.7)
-
Step 600
600
#4272BF
oklch(55.6% 0.131 259.4)
-
Step 700
700 (this color)
#3A66AC
oklch(51.4% 0.122 259.3)
-
Step 800
800
#2B4E85
oklch(42.6% 0.1 259.1)
-
Step 900
900
#27416B
oklch(37.6% 0.079 259.6)
-
Step 950
950
#17263F
oklch(26.9% 0.051 260.2)
#3A66AC 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) | #466CAF | 0.023 |
| Deuteranopia (no green cones) | #3561AB | 0.016 |
| Tritanopia (no blue cones) | #007680 | 0.100 |
| Achromatopsia (no color) | #666666 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A66AC
#3A66AC
oklch(51.4% 0.122 259.3)
- #875F00
#875F00
oklch(51.4% 0.107 79.9)
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 #3A66AC, 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 0.040
- Dusky Blue #475F94 ΔE 0.040
- Muted Blue #3B719F ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.047
- Denim #3B638C ΔE 0.051
- Peacock Blue #016795 ΔE 0.052
Use #3A66AC 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.