#6363CD
Closest named color: Dark Periwinkle (#665FD1). oklch(55.4% 0.16 279.8), rgb(99, 99, 205).
Aa
White text reads best on this color (5.00:1).
About this color
#6363CD is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.160 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.012 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #6363CD |
| RGB | rgb(99, 99, 205) |
| HSL | hsl(240, 51%, 60%) |
| OKLCH | oklch(55.4% 0.16 279.8) |
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 #6363CD | 5.00:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #6363CD | 4.19:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #6363CD text on white | 5.00:1 | AA | Lc 74.4 | Content text, not long reading |
| #6363CD text on black | 4.19:1 | AA large text | Lc -27.4 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F4
oklch(88.5% 0.04 279.3)
-
Step 300
300
#B7BCEF
oklch(80.9% 0.072 280.3)
-
Step 400
400
#9298E7
oklch(70.6% 0.115 279.7)
-
Step 500
500
#797DE0
oklch(63.2% 0.147 279.6)
-
Step 600
600 (this color)
#6363CD
oklch(55.4% 0.16 279.8)
-
Step 700
700
#5352B2
oklch(49.1% 0.149 279.9)
-
Step 800
800
#444490
oklch(42.8% 0.122 279.9)
-
Step 900
900
#393A73
oklch(37.8% 0.096 280)
-
Step 950
950
#212243
oklch(26.9% 0.061 280.2)
#6363CD 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) | #2C73D1 | 0.064 |
| Deuteranopia (no green cones) | #1F6BCB | 0.068 |
| Tritanopia (no blue cones) | #377B8E | 0.140 |
| Achromatopsia (no color) | #6F6F6F | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6363CD
#6363CD
oklch(55.4% 0.16 279.8)
- #837300
#837300
oklch(55.3% 0.115 99.6)
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 #6363CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.012
- Slate Blue #6A5ACD ΔE 0.023
- Light Indigo #6D5ACF ΔE 0.025
- Iris #6258C4 ΔE 0.029
- Royal Blue #4169E1 ΔE 0.050
- Warm Blue #4B57DB ΔE 0.052
- Medium Slate Blue #7B68EE ΔE 0.063
- Neon Blue #4361EE ΔE 0.064
Use #6363CD 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.