#6368C8
Closest named color: Dark Periwinkle (#665FD1). oklch(56% 0.146 278.3), rgb(99, 104, 200).
Aa
White text reads best on this color (4.83:1).
About this color
#6368C8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.146 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.028 away. White text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.34:1 |
| White text | 4.83:1 |
Values
| HEX | #6368C8 |
| RGB | rgb(99, 104, 200) |
| HSL | hsl(237, 48%, 59%) |
| OKLCH | oklch(56% 0.146 278.3) |
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 #6368C8 | 4.83:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #6368C8 | 4.34:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #6368C8 text on white | 4.83:1 | AA | Lc 73.3 | Content text, not long reading |
| #6368C8 text on black | 4.34:1 | AA large text | Lc -28.4 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B6BDEB
oklch(80.9% 0.065 278.1)
-
Step 400
400
#929AE2
oklch(70.8% 0.105 278.5)
-
Step 500
500
#787FD9
oklch(63.1% 0.134 278.4)
-
Step 600
600 (this color)
#6368C8
oklch(56% 0.146 278.3)
-
Step 700
700
#5155AC
oklch(49.2% 0.136 278.1)
-
Step 800
800
#42468B
oklch(42.7% 0.112 278)
-
Step 900
900
#383B6F
oklch(37.7% 0.088 278.8)
-
Step 950
950
#202341
oklch(27% 0.056 277.7)
#6368C8 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) | #3D76CB | 0.051 |
| Deuteranopia (no green cones) | #336EC6 | 0.053 |
| Tritanopia (no blue cones) | #3A7D8E | 0.129 |
| Achromatopsia (no color) | #727272 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6368C8
#6368C8
oklch(56% 0.146 278.3)
- #877400
#877400
oklch(56% 0.116 97.7)
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 #6368C8, closest first.
No curated palette has a color within ΔE 0.04 of #6368C8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.028
- Slate Blue #6A5ACD ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.038
- Iris #6258C4 ΔE 0.040
- Royal Blue #4169E1 ΔE 0.054
- French Blue #436BAD ΔE 0.061
- Windows Blue #3778BF ΔE 0.063
- Warm Blue #4B57DB ΔE 0.065
Use #6368C8 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.