#5B66AA
Closest named color: French Blue (#436BAD). oklch(53.2% 0.107 275.2), rgb(91, 102, 170).
Aa
White text reads best on this color (5.34:1).
About this color
#5B66AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.107 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.030 away. White text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.92:1 |
| White text | 5.34:1 |
Values
| HEX | #5B66AA |
| RGB | rgb(91, 102, 170) |
| HSL | hsl(232, 32%, 51%) |
| OKLCH | oklch(53.2% 0.107 275.2) |
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 #5B66AA | 5.34:1 | AA | Lc -81.9 | Fine for body text |
| Black text on #5B66AA | 3.92:1 | AA large text | Lc 27.5 | Dividers and decoration only |
| #5B66AA text on white | 5.34:1 | AA | Lc 76.5 | Fine for body text |
| #5B66AA text on black | 3.92:1 | AA large text | Lc -25.2 | 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 600.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B7BFE0
oklch(80.9% 0.047 274.6)
-
Step 400
400
#929DD1
oklch(70.6% 0.077 275)
-
Step 500
500
#7884C5
oklch(63% 0.099 275.2)
-
Step 600
600 (this color)
#5B66AA
oklch(53.2% 0.107 275.2)
-
Step 700
700
#515B99
oklch(49.2% 0.1 275.2)
-
Step 800
800
#424A7C
oklch(42.6% 0.083 275.4)
-
Step 900
900
#383E64
oklch(37.7% 0.065 276)
-
Step 950
950
#21253A
oklch(27.1% 0.04 275.2)
#5B66AA 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) | #4D6EAD | 0.026 |
| Deuteranopia (no green cones) | #4668A8 | 0.027 |
| Tritanopia (no blue cones) | #3F7480 | 0.094 |
| Achromatopsia (no color) | #6B6B6B | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B66AA
#5B66AA
oklch(53.2% 0.107 275.2)
- #806B07
#806B07
oklch(53.2% 0.107 95.1)
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 #5B66AA, closest first.
No curated palette has a color within ΔE 0.04 of #5B66AA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.048
- Dusky Blue #475F94 ΔE 0.048
- Muted Blue #3B719F ΔE 0.052
- Mid Blue #276AB3 ΔE 0.054
- Dull Blue #49759C ΔE 0.056
- Iris #6258C4 ΔE 0.059
- Windows Blue #3778BF ΔE 0.060
Use #5B66AA 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.