#5B6CCB
Closest named color: Dark Periwinkle (#665FD1). oklch(56.5% 0.147 273.2), rgb(91, 108, 203).
Aa
White text reads best on this color (4.71:1).
About this color
#5B6CCB is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.147 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.036 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #5B6CCB |
| RGB | rgb(91, 108, 203) |
| HSL | hsl(231, 52%, 58%) |
| OKLCH | oklch(56.5% 0.147 273.2) |
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 #5B6CCB | 4.71:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #5B6CCB | 4.45:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #5B6CCB text on white | 4.71:1 | AA | Lc 72.5 | Content text, not long reading |
| #5B6CCB text on black | 4.45:1 | AA large text | Lc -29.1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B2BEEC
oklch(80.8% 0.066 273.4)
-
Step 400
400
#8B9CE3
oklch(70.8% 0.106 273.1)
-
Step 500
500
#6F82DB
oklch(63.2% 0.135 272.9)
-
Step 600
600 (this color)
#5B6CCB
oklch(56.5% 0.147 273.2)
-
Step 700
700
#4957AD
oklch(49.1% 0.137 273.4)
-
Step 800
800
#3C488C
oklch(42.8% 0.113 273.2)
-
Step 900
900
#333D70
oklch(37.8% 0.088 273.2)
-
Step 950
950
#1E2442
oklch(27.1% 0.056 273.5)
#5B6CCB 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) | #4078CF | 0.039 |
| Deuteranopia (no green cones) | #326FC9 | 0.042 |
| Tritanopia (no blue cones) | #1E8192 | 0.130 |
| Achromatopsia (no color) | #737373 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6CCB
#5B6CCB
oklch(56.5% 0.147 273.2)
- #8D7300
#8D7300
oklch(56.4% 0.116 93.1)
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 #5B6CCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.036
- Royal Blue #4169E1 ΔE 0.046
- Slate Blue #6A5ACD ΔE 0.047
- Light Indigo #6D5ACF ΔE 0.049
- Iris #6258C4 ΔE 0.049
- Windows Blue #3778BF ΔE 0.052
- French Blue #436BAD ΔE 0.056
- Warm Blue #4B57DB ΔE 0.065
Use #5B6CCB 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.