#5B6FCB
Closest named color: Dark Periwinkle (#665FD1). oklch(57.1% 0.143 271.9), rgb(91, 111, 203).
Aa
White text reads best on this color (4.58:1).
About this color
#5B6FCB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.143 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.043 away. White text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.58:1 |
| White text | 4.58:1 |
Values
| HEX | #5B6FCB |
| RGB | rgb(91, 111, 203) |
| HSL | hsl(229, 52%, 58%) |
| OKLCH | oklch(57.1% 0.143 271.9) |
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 #5B6FCB | 4.58:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #5B6FCB | 4.58:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #5B6FCB text on white | 4.58:1 | AA | Lc 71.6 | Content text, not long reading |
| #5B6FCB text on black | 4.58:1 | AA | Lc -30.0 | Non-text elements, placeholder text |
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
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B2BFEB
oklch(81% 0.064 272)
-
Step 400
400
#8A9DE1
oklch(70.8% 0.102 271.6)
-
Step 500
500
#6E83D9
oklch(63.2% 0.132 271.8)
-
Step 600
600 (this color)
#5B6FCB
oklch(57.1% 0.143 271.9)
-
Step 700
700
#4758AB
oklch(49% 0.133 271.9)
-
Step 800
800
#3B498B
oklch(42.8% 0.11 272)
-
Step 900
900
#323D6F
oklch(37.7% 0.087 272.3)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#5B6FCB 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) | #467ACE | 0.034 |
| Deuteranopia (no green cones) | #3871C9 | 0.037 |
| Tritanopia (no blue cones) | #1D8393 | 0.127 |
| Achromatopsia (no color) | #757575 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6FCB
#5B6FCB
oklch(57.1% 0.143 271.9)
- #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 #5B6FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.043
- Windows Blue #3778BF ΔE 0.048
- Royal Blue #4169E1 ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.054
- Light Indigo #6D5ACF ΔE 0.056
- French Blue #436BAD ΔE 0.057
- Iris #6258C4 ΔE 0.057
- Mid Blue #276AB3 ΔE 0.068
Use #5B6FCB 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.