#5B6FCE
Closest named color: Dark Periwinkle (#665FD1). oklch(57.3% 0.147 272.1), rgb(91, 111, 206).
Aa
Black text reads best on this color (4.60:1).
About this color
#5B6FCE is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.147 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.041 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.60:1 |
| White text | 4.55:1 |
Values
| HEX | #5B6FCE |
| RGB | rgb(91, 111, 206) |
| HSL | hsl(230, 54%, 58%) |
| OKLCH | oklch(57.3% 0.147 272.1) |
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 #5B6FCE | 4.55:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #5B6FCE | 4.60:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #5B6FCE text on white | 4.55:1 | AA | Lc 71.4 | Content text, not long reading |
| #5B6FCE text on black | 4.60:1 | AA | Lc -30.2 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B1BFEC
oklch(80.9% 0.066 271.4)
-
Step 400
400
#899CE3
oklch(70.6% 0.106 272)
-
Step 500
500
#6D82DB
oklch(63% 0.136 272)
-
Step 600
600 (this color)
#5B6FCE
oklch(57.3% 0.147 272.1)
-
Step 700
700
#4758AD
oklch(49.1% 0.136 272)
-
Step 800
800
#3A488C
oklch(42.6% 0.113 272)
-
Step 900
900
#323D70
oklch(37.7% 0.088 272.4)
-
Step 950
950
#1D2442
oklch(27% 0.057 272.2)
#5B6FCE 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) | #437BD2 | 0.037 |
| Deuteranopia (no green cones) | #3471CC | 0.040 |
| Tritanopia (no blue cones) | #178494 | 0.132 |
| Achromatopsia (no color) | #767676 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6FCE
#5B6FCE
oklch(57.3% 0.147 272.1)
- #917500
#917500
oklch(57.3% 0.117 92.1)
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 #5B6FCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.041
- Royal Blue #4169E1 ΔE 0.046
- Windows Blue #3778BF ΔE 0.050
- Slate Blue #6A5ACD ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.055
- Iris #6258C4 ΔE 0.057
- French Blue #436BAD ΔE 0.061
- Cornflower #6A79F7 ΔE 0.069
Use #5B6FCE 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.