#5B6FCC
Closest named color: Dark Periwinkle (#665FD1). oklch(57.1% 0.144 272), rgb(91, 111, 204).
Aa
Black text reads best on this color (4.59:1).
About this color
#5B6FCC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.144 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.042 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.59:1 |
| White text | 4.57:1 |
Values
| HEX | #5B6FCC |
| RGB | rgb(91, 111, 204) |
| HSL | hsl(229, 53%, 58%) |
| OKLCH | oklch(57.1% 0.144 272) |
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 #5B6FCC | 4.57:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #5B6FCC | 4.59:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #5B6FCC text on white | 4.57:1 | AA | Lc 71.6 | Content text, not long reading |
| #5B6FCC text on black | 4.59:1 | AA | Lc -30.1 | 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
#8A9CE2
oklch(70.6% 0.105 272.4)
-
Step 500
500
#6E82D9
oklch(63% 0.133 272.3)
-
Step 600
600 (this color)
#5B6FCC
oklch(57.1% 0.144 272)
-
Step 700
700
#4758AC
oklch(49.1% 0.135 272)
-
Step 800
800
#3A488B
oklch(42.6% 0.112 272)
-
Step 900
900
#323D6F
oklch(37.7% 0.087 272.3)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#5B6FCC 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) | #457BCF | 0.036 |
| Deuteranopia (no green cones) | #3771CA | 0.038 |
| Tritanopia (no blue cones) | #1B8493 | 0.130 |
| Achromatopsia (no color) | #767676 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6FCC
#5B6FCC
oklch(57.1% 0.144 272)
- #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 #5B6FCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.042
- Royal Blue #4169E1 ΔE 0.048
- Windows Blue #3778BF ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.054
- Light Indigo #6D5ACF ΔE 0.055
- Iris #6258C4 ΔE 0.057
- French Blue #436BAD ΔE 0.058
- Mid Blue #276AB3 ΔE 0.069
Use #5B6FCC 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.