#3C66A7
Closest named color: French Blue (#436BAD). oklch(51.2% 0.114 258.8), rgb(60, 102, 167).
Aa
White text reads best on this color (5.75:1).
About this color
#3C66A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.114 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.019 away. White text reads best on it, at 5.75:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.65:1 |
| White text | 5.75:1 |
Values
| HEX | #3C66A7 |
| RGB | rgb(60, 102, 167) |
| HSL | hsl(216, 47%, 45%) |
| OKLCH | oklch(51.2% 0.114 258.8) |
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 #3C66A7 | 5.75:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #3C66A7 | 3.65:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #3C66A7 text on white | 5.75:1 | AA | Lc 78.6 | Fine for body text |
| #3C66A7 text on black | 3.65:1 | AA large text | Lc -23.2 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E5
oklch(80.9% 0.056 258.7)
-
Step 400
400
#7FA2D8
oklch(70.7% 0.089 258.9)
-
Step 500
500
#5F8ACD
oklch(63.1% 0.112 259)
-
Step 600
600
#4573BA
oklch(55.7% 0.122 258.8)
-
Step 700
700 (this color)
#3C66A7
oklch(51.2% 0.114 258.8)
-
Step 800
800
#2D4F82
oklch(42.8% 0.094 258.3)
-
Step 900
900
#294268
oklch(37.8% 0.072 258.5)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#3C66A7 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) | #4A6BAA | 0.023 |
| Deuteranopia (no green cones) | #3A61A6 | 0.015 |
| Tritanopia (no blue cones) | #00757E | 0.095 |
| Achromatopsia (no color) | #666666 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C66A7
#3C66A7
oklch(51.2% 0.114 258.8)
- #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 #3C66A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.019
- Mid Blue #276AB3 ΔE 0.024
- Dusky Blue #475F94 ΔE 0.033
- Muted Blue #3B719F ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.042
- Denim #3B638C ΔE 0.043
- Peacock Blue #016795 ΔE 0.047
Use #3C66A7 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.