#5B6FC8
Closest named color: Dark Periwinkle (#665FD1). oklch(56.9% 0.139 271.8), rgb(91, 111, 200).
Aa
White text reads best on this color (4.61:1).
About this color
#5B6FC8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.139 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.045 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.55:1 |
| White text | 4.61:1 |
Values
| HEX | #5B6FC8 |
| RGB | rgb(91, 111, 200) |
| HSL | hsl(229, 50%, 57%) |
| OKLCH | oklch(56.9% 0.139 271.8) |
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 #5B6FC8 | 4.61:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #5B6FC8 | 4.55:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #5B6FC8 text on white | 4.61:1 | AA | Lc 71.9 | Content text, not long reading |
| #5B6FC8 text on black | 4.55:1 | AA | Lc -29.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F6
oklch(93.5% 0.018 272.3)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B2BFEA
oklch(80.9% 0.063 271.8)
-
Step 400
400
#8A9DDF
oklch(70.7% 0.099 271.4)
-
Step 500
500
#6E83D6
oklch(63% 0.127 271.6)
-
Step 600
600 (this color)
#5B6FC8
oklch(56.9% 0.139 271.8)
-
Step 700
700
#4859A9
oklch(49.1% 0.129 271.9)
-
Step 800
800
#3B4989
oklch(42.7% 0.107 271.9)
-
Step 900
900
#323E6E
oklch(37.8% 0.083 271.3)
-
Step 950
950
#1D2440
oklch(26.9% 0.053 271.8)
#5B6FC8 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) | #487ACB | 0.033 |
| Deuteranopia (no green cones) | #3B71C6 | 0.035 |
| Tritanopia (no blue cones) | #228292 | 0.122 |
| Achromatopsia (no color) | #757575 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6FC8
#5B6FC8
oklch(56.9% 0.139 271.8)
- #907400
#907400
oklch(57% 0.116 91.9)
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 #5B6FC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.045
- Windows Blue #3778BF ΔE 0.045
- Royal Blue #4169E1 ΔE 0.053
- French Blue #436BAD ΔE 0.053
- Slate Blue #6A5ACD ΔE 0.055
- Iris #6258C4 ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.065
Use #5B6FC8 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.