#5966B3
Closest named color: French Blue (#436BAD). oklch(53.6% 0.121 274.4), rgb(89, 102, 179).
Aa
White text reads best on this color (5.28:1).
About this color
#5966B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.121 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.031 away. White text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #5966B3 |
| RGB | rgb(89, 102, 179) |
| HSL | hsl(231, 37%, 53%) |
| OKLCH | oklch(53.6% 0.121 274.4) |
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 #5966B3 | 5.28:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #5966B3 | 3.97:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #5966B3 text on white | 5.28:1 | AA | Lc 76.1 | Fine for body text |
| #5966B3 text on black | 3.97:1 | AA large text | Lc -25.6 | 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 600.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D3D8EE
oklch(88.5% 0.031 275.6)
-
Step 300
300
#B5BFE5
oklch(81% 0.055 273.5)
-
Step 400
400
#909DD7
oklch(70.8% 0.086 274.3)
-
Step 500
500
#7583CD
oklch(63% 0.113 274.6)
-
Step 600
600 (this color)
#5966B3
oklch(53.6% 0.121 274.4)
-
Step 700
700
#4E5AA0
oklch(49.2% 0.112 274.2)
-
Step 800
800
#404A82
oklch(42.8% 0.093 274.2)
-
Step 900
900
#363E68
oklch(37.7% 0.073 274.2)
-
Step 950
950
#20243D
oklch(26.9% 0.047 275.9)
#5966B3 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) | #4770B6 | 0.032 |
| Deuteranopia (no green cones) | #3E68B1 | 0.032 |
| Tritanopia (no blue cones) | #347684 | 0.106 |
| Achromatopsia (no color) | #6C6C6C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5966B3
#5966B3
oklch(53.6% 0.121 274.4)
- #826C00
#826C00
oklch(53.7% 0.11 94.9)
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 #5966B3, closest first.
No curated palette has a color within ΔE 0.04 of #5966B3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.031
- Iris #6258C4 ΔE 0.048
- Mid Blue #276AB3 ΔE 0.050
- Flat Blue #3C73A8 ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.055
- Windows Blue #3778BF ΔE 0.055
- Dusky Blue #475F94 ΔE 0.058
- Slate Blue #6A5ACD ΔE 0.058
Use #5966B3 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.