#5B5FD0
Closest named color: Dark Periwinkle (#665FD1). oklch(54.3% 0.171 277.5), rgb(91, 95, 208).
Aa
White text reads best on this color (5.25:1).
About this color
#5B5FD0 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.171 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.016 away. White text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 3.99:1 |
| White text | 5.25:1 |
Values
| HEX | #5B5FD0 |
| RGB | rgb(91, 95, 208) |
| HSL | hsl(238, 55%, 59%) |
| OKLCH | oklch(54.3% 0.171 277.5) |
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 #5B5FD0 | 5.25:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #5B5FD0 | 3.99:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #5B5FD0 text on white | 5.25:1 | AA | Lc 75.8 | Fine for body text |
| #5B5FD0 text on black | 3.99:1 | AA large text | Lc -25.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F6
oklch(88.5% 0.043 278.2)
-
Step 300
300
#B4BDF3
oklch(81% 0.077 277.2)
-
Step 400
400
#8E98EC
oklch(70.6% 0.123 277.6)
-
Step 500
500
#747CE6
oklch(63% 0.157 277.6)
-
Step 600
600 (this color)
#5B5FD0
oklch(54.3% 0.171 277.5)
-
Step 700
700
#4E51B8
oklch(49% 0.159 277.5)
-
Step 800
800
#404395
oklch(42.7% 0.132 277.7)
-
Step 900
900
#363A77
oklch(37.8% 0.102 277.5)
-
Step 950
950
#1F2245
oklch(26.9% 0.064 277.4)
#5B5FD0 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) | #1471D4 | 0.068 |
| Deuteranopia (no green cones) | #0067CE | 0.068 |
| Tritanopia (no blue cones) | #19798E | 0.149 |
| Achromatopsia (no color) | #6C6C6C | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5FD0
#5B5FD0
oklch(54.3% 0.171 277.5)
- #826F00
#826F00
oklch(54.3% 0.112 97.2)
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 #5B5FD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.016
- Slate Blue #6A5ACD ΔE 0.024
- Iris #6258C4 ΔE 0.025
- Light Indigo #6D5ACF ΔE 0.028
- Warm Blue #4B57DB ΔE 0.035
- Royal Blue #4169E1 ΔE 0.042
- Neon Blue #4361EE ΔE 0.053
- Bluey Purple #6241C7 ΔE 0.067
Use #5B5FD0 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.