#5F66AB
Closest named color: French Blue (#436BAD). oklch(53.6% 0.108 277.7), rgb(95, 102, 171).
Aa
White text reads best on this color (5.28:1).
About this color
#5F66AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.108 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.035 away. White text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #5F66AB |
| RGB | rgb(95, 102, 171) |
| HSL | hsl(234, 31%, 52%) |
| OKLCH | oklch(53.6% 0.108 277.7) |
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 #5F66AB | 5.28:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #5F66AB | 3.97:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #5F66AB text on white | 5.28:1 | AA | Lc 76.2 | Fine for body text |
| #5F66AB 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B9BEE0
oklch(80.9% 0.048 278.7)
-
Step 400
400
#959CD1
oklch(70.7% 0.078 278.4)
-
Step 500
500
#7B83C5
oklch(63% 0.1 277.8)
-
Step 600
600 (this color)
#5F66AB
oklch(53.6% 0.108 277.7)
-
Step 700
700
#545A99
oklch(49.2% 0.1 277.9)
-
Step 800
800
#444A7C
oklch(42.8% 0.083 277.1)
-
Step 900
900
#393E64
oklch(37.7% 0.065 277.1)
-
Step 950
950
#22243A
oklch(26.9% 0.041 279.3)
#5F66AB 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) | #4D6FAE | 0.031 |
| Deuteranopia (no green cones) | #4769A9 | 0.031 |
| Tritanopia (no blue cones) | #467480 | 0.095 |
| Achromatopsia (no color) | #6C6C6C | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F66AB
#5F66AB
oklch(53.6% 0.108 277.7)
- #7F6D09
#7F6D09
oklch(53.6% 0.108 97.3)
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 #5F66AB, closest first.
No curated palette has a color within ΔE 0.04 of #5F66AB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.053
- Muted Blue #3B719F ΔE 0.056
- Iris #6258C4 ΔE 0.057
- Dull Blue #49759C ΔE 0.059
- Mid Blue #276AB3 ΔE 0.059
- Windows Blue #3778BF ΔE 0.062
Use #5F66AB 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.