#5B5DD4
Closest named color: Dark Periwinkle (#665FD1). oklch(54.2% 0.179 277.9), rgb(91, 93, 212).
Aa
White text reads best on this color (5.30:1).
About this color
#5B5DD4 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.179 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.018 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 3.96:1 |
| White text | 5.30:1 |
Values
| HEX | #5B5DD4 |
| RGB | rgb(91, 93, 212) |
| HSL | hsl(239, 58%, 59%) |
| OKLCH | oklch(54.2% 0.179 277.9) |
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 #5B5DD4 | 5.30:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #5B5DD4 | 3.96:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #5B5DD4 text on white | 5.30:1 | AA | Lc 76.0 | Fine for body text |
| #5B5DD4 text on black | 3.96:1 | AA large text | Lc -25.7 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F7
oklch(88.5% 0.044 278.4)
-
Step 300
300
#B4BCF5
oklch(80.9% 0.081 278.2)
-
Step 400
400
#8E98F0
oklch(70.8% 0.129 277.6)
-
Step 500
500
#747BEA
oklch(63% 0.164 277.9)
-
Step 600
600 (this color)
#5B5DD4
oklch(54.2% 0.179 277.9)
-
Step 700
700
#4E50BC
oklch(49.1% 0.166 277.6)
-
Step 800
800
#404298
oklch(42.7% 0.138 277.8)
-
Step 900
900
#363979
oklch(37.8% 0.107 277.9)
-
Step 950
950
#1F2247
oklch(27.1% 0.068 277.3)
#5B5DD4 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) | #0070D8 | 0.073 |
| Deuteranopia (no green cones) | #0066D2 | 0.069 |
| Tritanopia (no blue cones) | #10798F | 0.157 |
| Achromatopsia (no color) | #6B6B6B | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5DD4
#5B5DD4
oklch(54.2% 0.179 277.9)
- #816F00
#816F00
oklch(54.2% 0.112 97.9)
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 #5B5DD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.018
- Slate Blue #6A5ACD ΔE 0.025
- Iris #6258C4 ΔE 0.028
- Light Indigo #6D5ACF ΔE 0.028
- Warm Blue #4B57DB ΔE 0.030
- Royal Blue #4169E1 ΔE 0.042
- Neon Blue #4361EE ΔE 0.048
- Bluey Purple #6241C7 ΔE 0.063
Use #5B5DD4 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.