#6363DD
Closest named color: Dark Periwinkle (#665FD1). oklch(56.5% 0.182 278.9), rgb(99, 99, 221).
Aa
White text reads best on this color (4.81:1).
About this color
#6363DD is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.182 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.020 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.35:1 |
| White text | 4.81:1 |
Values
| HEX | #6363DD |
| RGB | rgb(99, 99, 221) |
| HSL | hsl(240, 64%, 63%) |
| OKLCH | oklch(56.5% 0.182 278.9) |
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 #6363DD | 4.81:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #6363DD | 4.35:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #6363DD text on white | 4.81:1 | AA | Lc 73.1 | Content text, not long reading |
| #6363DD text on black | 4.35:1 | AA large text | Lc -28.6 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F8
oklch(88.6% 0.046 278.6)
-
Step 300
300
#B5BCF5
oklch(81% 0.081 279)
-
Step 400
400
#8F97F1
oklch(70.7% 0.131 278.6)
-
Step 500
500
#767AEB
oklch(63.1% 0.167 279)
-
Step 600
600 (this color)
#6363DD
oklch(56.5% 0.182 278.9)
-
Step 700
700
#504EBD
oklch(49% 0.17 278.9)
-
Step 800
800
#414199
oklch(42.7% 0.14 278.7)
-
Step 900
900
#37387A
oklch(37.7% 0.11 279.1)
-
Step 950
950
#202147
oklch(26.9% 0.069 279.5)
#6363DD 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) | #0777E1 | 0.078 |
| Deuteranopia (no green cones) | #006DDA | 0.075 |
| Tritanopia (no blue cones) | #247F96 | 0.158 |
| Achromatopsia (no color) | #727272 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6363DD
#6363DD
oklch(56.5% 0.182 278.9)
- #887600
#887600
oklch(56.5% 0.117 98.6)
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 #6363DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.020
- Light Indigo #6D5ACF ΔE 0.031
- Slate Blue #6A5ACD ΔE 0.032
- Royal Blue #4169E1 ΔE 0.041
- Iris #6258C4 ΔE 0.045
- Warm Blue #4B57DB ΔE 0.046
- Medium Slate Blue #7B68EE ΔE 0.046
- Neon Blue #4361EE ΔE 0.048
Use #6363DD 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.