#5B6CD2
Closest named color: Dark Periwinkle (#665FD1). oklch(56.9% 0.157 273.3), rgb(91, 108, 210).
Aa
White text reads best on this color (4.64:1).
About this color
#5B6CD2 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.157 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.033 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.52:1 |
| White text | 4.64:1 |
Values
| HEX | #5B6CD2 |
| RGB | rgb(91, 108, 210) |
| HSL | hsl(231, 57%, 59%) |
| OKLCH | oklch(56.9% 0.157 273.3) |
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 #5B6CD2 | 4.64:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #5B6CD2 | 4.52:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #5B6CD2 text on white | 4.64:1 | AA | Lc 72.0 | Content text, not long reading |
| #5B6CD2 text on black | 4.52:1 | AA | Lc -29.7 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B1BEEF
oklch(80.8% 0.071 273.1)
-
Step 400
400
#8A9BE7
oklch(70.7% 0.113 273.6)
-
Step 500
500
#6E81E0
oklch(63.2% 0.144 273.1)
-
Step 600
600 (this color)
#5B6CD2
oklch(56.9% 0.157 273.3)
-
Step 700
700
#4856B2
oklch(49.1% 0.146 273.3)
-
Step 800
800
#3B4790
oklch(42.8% 0.12 273.2)
-
Step 900
900
#323C73
oklch(37.7% 0.094 273.3)
-
Step 950
950
#1D2443
oklch(27.1% 0.058 272.4)
#5B6CD2 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) | #3A7AD6 | 0.045 |
| Deuteranopia (no green cones) | #2770D0 | 0.049 |
| Tritanopia (no blue cones) | #0F8395 | 0.139 |
| Achromatopsia (no color) | #747474 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6CD2
#5B6CD2
oklch(56.9% 0.157 273.3)
- #8F7500
#8F7500
oklch(57.1% 0.117 93.3)
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 #5B6CD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.033
- Royal Blue #4169E1 ΔE 0.039
- Slate Blue #6A5ACD ΔE 0.046
- Light Indigo #6D5ACF ΔE 0.047
- Iris #6258C4 ΔE 0.051
- Windows Blue #3778BF ΔE 0.058
- Warm Blue #4B57DB ΔE 0.060
- Neon Blue #4361EE ΔE 0.061
Use #5B6CD2 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.