#6364CC
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.157 279.6), rgb(99, 100, 204).
Aa
White text reads best on this color (4.97:1).
About this color
#6364CC is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.157 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.015 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #6364CC |
| RGB | rgb(99, 100, 204) |
| HSL | hsl(239, 51%, 59%) |
| OKLCH | oklch(55.5% 0.157 279.6) |
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 #6364CC | 4.97:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #6364CC | 4.22:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #6364CC text on white | 4.97:1 | AA | Lc 74.2 | Content text, not long reading |
| #6364CC text on black | 4.22:1 | AA large text | Lc -27.6 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B7BCEE
oklch(80.8% 0.071 280.2)
-
Step 400
400
#9298E6
oklch(70.6% 0.114 279.7)
-
Step 500
500
#797DDF
oklch(63.1% 0.145 279.6)
-
Step 600
600 (this color)
#6364CC
oklch(55.5% 0.157 279.6)
-
Step 700
700
#5252B1
oklch(49% 0.147 279.5)
-
Step 800
800
#43448F
oklch(42.7% 0.121 279.4)
-
Step 900
900
#383A72
oklch(37.7% 0.094 279.3)
-
Step 950
950
#212243
oklch(26.9% 0.061 280.2)
#6364CC 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) | #3074D0 | 0.062 |
| Deuteranopia (no green cones) | #246CCA | 0.065 |
| Tritanopia (no blue cones) | #387B8E | 0.137 |
| Achromatopsia (no color) | #707070 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6364CC
#6364CC
oklch(55.5% 0.157 279.6)
- #847400
#847400
oklch(55.7% 0.116 99.7)
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 #6364CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.015
- Slate Blue #6A5ACD ΔE 0.025
- Light Indigo #6D5ACF ΔE 0.027
- Iris #6258C4 ΔE 0.031
- Royal Blue #4169E1 ΔE 0.050
- Warm Blue #4B57DB ΔE 0.054
- Medium Slate Blue #7B68EE ΔE 0.064
- Neon Blue #4361EE ΔE 0.066
Use #6364CC 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.