#5166A8
Closest named color: French Blue (#436BAD). oklch(52.4% 0.107 269.1), rgb(81, 102, 168).
Aa
White text reads best on this color (5.50:1).
About this color
#5166A8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.107 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.020 away. White text reads best on it, at 5.50:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.81:1 |
| White text | 5.50:1 |
Values
| HEX | #5166A8 |
| RGB | rgb(81, 102, 168) |
| HSL | hsl(226, 35%, 49%) |
| OKLCH | oklch(52.4% 0.107 269.1) |
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 #5166A8 | 5.50:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #5166A8 | 3.81:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #5166A8 text on white | 5.50:1 | AA | Lc 77.4 | Fine for body text |
| #5166A8 text on black | 3.81:1 | AA large text | Lc -24.4 | 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
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B4C0E1
oklch(80.9% 0.049 269.5)
-
Step 400
400
#8D9FD2
oklch(70.7% 0.078 269.3)
-
Step 500
500
#7187C6
oklch(63.2% 0.099 268.8)
-
Step 600
600 (this color)
#5166A8
oklch(52.4% 0.107 269.1)
-
Step 700
700
#4A5D99
oklch(49.1% 0.099 269.2)
-
Step 800
800
#3D4C7C
oklch(42.7% 0.082 269.6)
-
Step 900
900
#344064
oklch(37.8% 0.064 269.2)
-
Step 950
950
#1E253B
oklch(26.9% 0.042 269.9)
#5166A8 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) | #4C6DAB | 0.019 |
| Deuteranopia (no green cones) | #4365A7 | 0.018 |
| Tritanopia (no blue cones) | #2A747F | 0.096 |
| Achromatopsia (no color) | #696969 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5166A8
#5166A8
oklch(52.4% 0.107 269.1)
- #836600
#836600
oklch(52.4% 0.107 89.1)
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 #5166A8, closest first.
No curated palette has a color within ΔE 0.04 of #5166A8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.020
- Dusky Blue #475F94 ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.040
- Mid Blue #276AB3 ΔE 0.042
- Muted Blue #3B719F ΔE 0.043
- Dull Blue #49759C ΔE 0.051
- Denim #3B638C ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.054
Use #5166A8 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.